Arvin 32R98

5/29/2007 6:30:57 PMDave Froehlich

Hello All,
This set is in SAMs 647-5. Someone worked on the power supply but didn't do the work correctly. Does anyone have a schematic for the power supply section. I'm getting a lot more hum than I think I should be hearing. Was this originally full-wave rectified? I found only a single diode. There is a filter choke but they usually do better with full wave rectifiers.
I would guess that those are 3 to 5 watt push pull amps. I've never seen that tube before. What is it similar to? (50C5?)

Thanks,

Dave

5/29/2007 9:17:22 PMEdward

It appears not much is similar. Check out:

http://datasheets.electron-tube.net/sheets/093/5/50C5.pdf

12C5, 12Cu5, 17C5, 50B5 and 25C5 are somewhat similar but different heater voltages.

Edward

:Hello All,
: This set is in SAMs 647-5. Someone worked on the power supply but didn't do the work correctly. Does anyone

schematic for the power supply section. I'm getting a lot more hum than I think I should be hearing. Was this originally full-wave rectified? I found only a single diode. There is a filter choke but they usually do better with full wave rectifiers.
: I would guess that those are 3 to 5 watt push pull amps. I've never seen that tube before. What is it similar to? (50C5?)
:
:Thanks,
:
:Dave

5/29/2007 10:11:56 PMDave Froehlich

Edward,
I was asking if the 32ET5 in the Arvin radio is similar to a 50C5. I have never seen a 32ET5 before.

Thanks,

Dave
:It appears not much is similar. Check out:
:
:http://datasheets.electron-tube.net/sheets/093/5/50C5.pdf
:
:12C5, 12Cu5, 17C5, 50B5 and 25C5 are somewhat similar but different heater voltages.
:
:Edward
:
:
:
::Hello All,
:: This set is in SAMs 647-5. Someone worked on the power supply but didn't do the work correctly. Does anyone
:
:schematic for the power supply section. I'm getting a lot more hum than I think I should be hearing. Was this originally full-wave rectified? I found only a single diode. There is a filter choke but they usually do better with full wave rectifiers.
:: I would guess that those are 3 to 5 watt push pull amps. I've never seen that tube before. What is it similar to? (50C5?)
::
::Thanks,
::
::Dave

5/29/2007 10:24:08 PMNorm Leal

Dave

32ET5 has the same basing as 50C5 but lower filament voltage (32) and current (100 ma). A sub for 50C5 could be 50EH5 but I wouldn't try to use 32ET5.

http://www.nj7p.org/Tube4.php?tube=32ET5

Norm

:Edward,
: I was asking if the 32ET5 in the Arvin radio is similar to a 50C5. I have never seen a 32ET5 before.
:
:Thanks,
:
:Dave
::It appears not much is similar. Check out:
::
::http://datasheets.electron-tube.net/sheets/093/5/50C5.pdf
::
::12C5, 12Cu5, 17C5, 50B5 and 25C5 are somewhat similar but different heater voltages.
::
::Edward
::
::
::
:::Hello All,
::: This set is in SAMs 647-5. Someone worked on the power supply but didn't do the work correctly. Does anyone
::
::schematic for the power supply section. I'm getting a lot more hum than I think I should be hearing. Was this originally full-wave rectified? I found only a single diode. There is a filter choke but they usually do better with full wave rectifiers.
::: I would guess that those are 3 to 5 watt push pull amps. I've never seen that tube before. What is it similar to? (50C5?)
:::
:::Thanks,
:::
:::Dave

5/29/2007 10:45:39 PMDave Froehlich

Norm.
This is not what I was asking about. I wanted to know more about the power supply in the Arvin 32R98. Was it just the single diode I found or did it originally have a full wave rectifier?

Thanks,

:Dave
:
: 32ET5 has the same basing as 50C5 but lower filament voltage (32) and current (100 ma). A sub for 50C5 could be 50EH5 but I wouldn't try to use 32ET5.
:
: http://www.nj7p.org/Tube4.php?tube=32ET5
:
:Norm
:
::Edward,
:: I was asking if the 32ET5 in the Arvin radio is similar to a 50C5. I have never seen a 32ET5 before.
::
::Thanks,
::
::Dave
:::It appears not much is similar. Check out:
:::
:::http://datasheets.electron-tube.net/sheets/093/5/50C5.pdf
:::
:::12C5, 12Cu5, 17C5, 50B5 and 25C5 are somewhat similar but different heater voltages.
:::
:::Edward
:::
:::
:::
::::Hello All,
:::: This set is in SAMs 647-5. Someone worked on the power supply but didn't do the work correctly. Does anyone
:::
:::schematic for the power supply section. I'm getting a lot more hum than I think I should be hearing. Was this originally full-wave rectified? I found only a single diode. There is a filter choke but they usually do better with full wave rectifiers.
:::: I would guess that those are 3 to 5 watt push pull amps. I've never seen that tube before. What is it similar to? (50C5?)
::::
::::Thanks,
::::
::::Dave

5/30/2007 10:39:01 AMNorm Leal

Dave

I don't have the schematic but US made radios usually have a single diode for rectifier. European radios often used a bridge rectifier.

Have your tried replacing electrolytic filter caps? Increasing value?

Norm

:Norm.
: This is not what I was asking about. I wanted to know more about the power supply in the Arvin 32R98. Was it just the single diode I found or did it originally have a full wave rectifier?
:
:Thanks,
:
::Dave
::
:: 32ET5 has the same basing as 50C5 but lower filament voltage (32) and current (100 ma). A sub for 50C5 could be 50EH5 but I wouldn't try to use 32ET5.
::
:: http://www.nj7p.org/Tube4.php?tube=32ET5
::
::Norm
::
:::Edward,
::: I was asking if the 32ET5 in the Arvin radio is similar to a 50C5. I have never seen a 32ET5 before.
:::
:::Thanks,
:::
:::Dave
::::It appears not much is similar. Check out:
::::
::::http://datasheets.electron-tube.net/sheets/093/5/50C5.pdf
::::
::::12C5, 12Cu5, 17C5, 50B5 and 25C5 are somewhat similar but different heater voltages.
::::
::::Edward
::::
::::
::::
:::::Hello All,
::::: This set is in SAMs 647-5. Someone worked on the power supply but didn't do the work correctly. Does anyone
::::
::::schematic for the power supply section. I'm getting a lot more hum than I think I should be hearing. Was this originally full-wave rectified? I found only a single diode. There is a filter choke but they usually do better with full wave rectifiers.
::::: I would guess that those are 3 to 5 watt push pull amps. I've never seen that tube before. What is it similar to? (50C5?)
:::::
:::::Thanks,
:::::
:::::Dave

5/30/2007 2:30:47 PMDave Froehlich

Norm,
This radio seems to be a terrible design with a hand wired low power push pull stereo amplifier on one side, and a terrible PC board on the other. It's loaded with tubes too.
I tried increasing the capacitance, and replacing the diode and it still hums a lot. There were two capacitors original to the radio which I replaced. Someone had added a third capacitor without replacing the old ones. I replaced that one as well. It's the first thing before the filter choke. Maybe it's negative isn't supposed to be connected to the same negative point as the other two capacitors. Maybe that's my problem. But it's difficult to tell when someone messed things up. Whoever worked on it before also attached two terminals from a transistor one to the chassis and one to one of the FM antenna connections. The third lead was left unconnected. This seemed ridiculous to me. So I removed it.

Thanks,

:Dave
:
: I don't have the schematic but US made radios usually have a single diode for rectifier. European radios often used a bridge rectifier.
:
: Have your tried replacing electrolytic filter caps? Increasing value?
:
:Norm
:
::Norm.
:: This is not what I was asking about. I wanted to know more about the power supply in the Arvin 32R98. Was it just the single diode I found or did it originally have a full wave rectifier?
::
::Thanks,
::
:::Dave
:::
::: 32ET5 has the same basing as 50C5 but lower filament voltage (32) and current (100 ma). A sub for 50C5 could be 50EH5 but I wouldn't try to use 32ET5.
:::
::: http://www.nj7p.org/Tube4.php?tube=32ET5
:::
:::Norm
:::
::::Edward,
:::: I was asking if the 32ET5 in the Arvin radio is similar to a 50C5. I have never seen a 32ET5 before.
::::
::::Thanks,
::::
::::Dave
:::::It appears not much is similar. Check out:
:::::
:::::http://datasheets.electron-tube.net/sheets/093/5/50C5.pdf
:::::
:::::12C5, 12Cu5, 17C5, 50B5 and 25C5 are somewhat similar but different heater voltages.
:::::
:::::Edward
:::::
:::::
:::::
::::::Hello All,
:::::: This set is in SAMs 647-5. Someone worked on the power supply but didn't do the work correctly. Does anyone
:::::
:::::schematic for the power supply section. I'm getting a lot more hum than I think I should be hearing. Was this originally full-wave rectified? I found only a single diode. There is a filter choke but they usually do better with full wave rectifiers.
:::::: I would guess that those are 3 to 5 watt push pull amps. I've never seen that tube before. What is it similar to? (50C5?)
::::::
::::::Thanks,
::::::
::::::Dave

5/30/2007 4:48:34 PMDave Froehlich

Norm,
That's one wierd power supply. There's something that looks like a power transformer but wires from the primary and secondary are connected together, and those wires connect to power supply negative. The other end of what looks like the secondary goes off into the tuner section. What looks like the other end of the primary is where one side of the AC like connects to, and so does one end of the power suppply diode (the anode). I will need a schematic because this doesn't make any sense to me. Does it make sense how I'm describing it?
Maybe Edd has the page with the power supply on it.
Maybe I can put a full wave rectifier in there somehow.

Thanks,

Dave
:Norm,
: This radio seems to be a terrible design with a hand wired low power push pull stereo amplifier on one side, and a terrible PC board on the other. It's loaded with tubes too.
: I tried increasing the capacitance, and replacing the diode and it still hums a lot. There were two capacitors original to the radio which I replaced. Someone had added a third capacitor without replacing the old ones. I replaced that one as well. It's the first thing before the filter choke. Maybe it's negative isn't supposed to be connected to the same negative point as the other two capacitors. Maybe that's my problem. But it's difficult to tell when someone messed things up. Whoever worked on it before also attached two terminals from a transistor one to the chassis and one to one of the FM antenna connections. The third lead was left unconnected. This seemed ridiculous to me. So I removed it.
:
:
:Thanks,
:
::Dave
::
:: I don't have the schematic but US made radios usually have a single diode for rectifier. European radios often used a bridge rectifier.
::
:: Have your tried replacing electrolytic filter caps? Increasing value?
::
::Norm
::
:::Norm.
::: This is not what I was asking about. I wanted to know more about the power supply in the Arvin 32R98. Was it just the single diode I found or did it originally have a full wave rectifier?
:::
:::Thanks,
:::
::::Dave
::::
:::: 32ET5 has the same basing as 50C5 but lower filament voltage (32) and current (100 ma). A sub for 50C5 could be 50EH5 but I wouldn't try to use 32ET5.
::::
:::: http://www.nj7p.org/Tube4.php?tube=32ET5
::::
::::Norm
::::
:::::Edward,
::::: I was asking if the 32ET5 in the Arvin radio is similar to a 50C5. I have never seen a 32ET5 before.
:::::
:::::Thanks,
:::::
:::::Dave
::::::It appears not much is similar. Check out:
::::::
::::::http://datasheets.electron-tube.net/sheets/093/5/50C5.pdf
::::::
::::::12C5, 12Cu5, 17C5, 50B5 and 25C5 are somewhat similar but different heater voltages.
::::::
::::::Edward
::::::
::::::
::::::
:::::::Hello All,
::::::: This set is in SAMs 647-5. Someone worked on the power supply but didn't do the work correctly. Does anyone
::::::
::::::schematic for the power supply section. I'm getting a lot more hum than I think I should be hearing. Was this originally full-wave rectified? I found only a single diode. There is a filter choke but they usually do better with full wave rectifiers.
::::::: I would guess that those are 3 to 5 watt push pull amps. I've never seen that tube before. What is it similar to? (50C5?)
:::::::
:::::::Thanks,
:::::::
:::::::Dave

5/30/2007 6:39:04 PMNorm Leal

Dave

Your transformer is wired as an autotransformer. There is no isolation from the line but you still have step up or down. Hopefully Ed has the schematic.

Norm

:Norm,
: That's one wierd power supply. There's something that looks like a power transformer but wires from the primary and secondary are connected together, and those wires connect to power supply negative. The other end of what looks like the secondary goes off into the tuner section. What looks like the other end of the primary is where one side of the AC like connects to, and so does one end of the power suppply diode (the anode). I will need a schematic because this doesn't make any sense to me. Does it make sense how I'm describing it?
: Maybe Edd has the page with the power supply on it.
: Maybe I can put a full wave rectifier in there somehow.
:
:Thanks,
:
:Dave
::Norm,
:: This radio seems to be a terrible design with a hand wired low power push pull stereo amplifier on one side, and a terrible PC board on the other. It's loaded with tubes too.
:: I tried increasing the capacitance, and replacing the diode and it still hums a lot. There were two capacitors original to the radio which I replaced. Someone had added a third capacitor without replacing the old ones. I replaced that one as well. It's the first thing before the filter choke. Maybe it's negative isn't supposed to be connected to the same negative point as the other two capacitors. Maybe that's my problem. But it's difficult to tell when someone messed things up. Whoever worked on it before also attached two terminals from a transistor one to the chassis and one to one of the FM antenna connections. The third lead was left unconnected. This seemed ridiculous to me. So I removed it.
::
::
::Thanks,
::
:::Dave
:::
::: I don't have the schematic but US made radios usually have a single diode for rectifier. European radios often used a bridge rectifier.
:::
::: Have your tried replacing electrolytic filter caps? Increasing value?
:::
:::Norm
:::
::::Norm.
:::: This is not what I was asking about. I wanted to know more about the power supply in the Arvin 32R98. Was it just the single diode I found or did it originally have a full wave rectifier?
::::
::::Thanks,
::::
:::::Dave
:::::
::::: 32ET5 has the same basing as 50C5 but lower filament voltage (32) and current (100 ma). A sub for 50C5 could be 50EH5 but I wouldn't try to use 32ET5.
:::::
::::: http://www.nj7p.org/Tube4.php?tube=32ET5
:::::
:::::Norm
:::::
::::::Edward,
:::::: I was asking if the 32ET5 in the Arvin radio is similar to a 50C5. I have never seen a 32ET5 before.
::::::
::::::Thanks,
::::::
::::::Dave
:::::::It appears not much is similar. Check out:
:::::::
:::::::http://datasheets.electron-tube.net/sheets/093/5/50C5.pdf
:::::::
:::::::12C5, 12Cu5, 17C5, 50B5 and 25C5 are somewhat similar but different heater voltages.
:::::::
:::::::Edward
:::::::
:::::::
:::::::
::::::::Hello All,
:::::::: This set is in SAMs 647-5. Someone worked on the power supply but didn't do the work correctly. Does anyone
:::::::
:::::::schematic for the power supply section. I'm getting a lot more hum than I think I should be hearing. Was this originally full-wave rectified? I found only a single diode. There is a filter choke but they usually do better with full wave rectifiers.
:::::::: I would guess that those are 3 to 5 watt push pull amps. I've never seen that tube before. What is it similar to? (50C5?)
::::::::
::::::::Thanks,
::::::::
::::::::Dave

5/30/2007 8:47:26 PMDave Froehlich

Norm,
This is interesting without the schematic. Probably when I see it on the schematic, it will make sense. Autotransformer? I thought that autotransformers were variable.
I hope Edd does have the schematic, but, as I read in another message, he wont be able to get to it until Saturday. If I have to, there's a complete set of early SAMs photofacts at a library about 50 miles away. I'm not sure it's worth the gasoline to go and get a copy of it for this radio.

Thanks,

:Dave
:
: Your transformer is wired as an autotransformer. There is no isolation from the line but you still have step up or down. Hopefully Ed has the schematic.
:
:Norm
:
:
::Norm,
:: That's one wierd power supply. There's something that looks like a power transformer but wires from the primary and secondary are connected together, and those wires connect to power supply negative. The other end of what looks like the secondary goes off into the tuner section. What looks like the other end of the primary is where one side of the AC like connects to, and so does one end of the power suppply diode (the anode). I will need a schematic because this doesn't make any sense to me. Does it make sense how I'm describing it?
:: Maybe Edd has the page with the power supply on it.
:: Maybe I can put a full wave rectifier in there somehow.
::
::Thanks,
::
::Dave
:::Norm,
::: This radio seems to be a terrible design with a hand wired low power push pull stereo amplifier on one side, and a terrible PC board on the other. It's loaded with tubes too.
::: I tried increasing the capacitance, and replacing the diode and it still hums a lot. There were two capacitors original to the radio which I replaced. Someone had added a third capacitor without replacing the old ones. I replaced that one as well. It's the first thing before the filter choke. Maybe it's negative isn't supposed to be connected to the same negative point as the other two capacitors. Maybe that's my problem. But it's difficult to tell when someone messed things up. Whoever worked on it before also attached two terminals from a transistor one to the chassis and one to one of the FM antenna connections. The third lead was left unconnected. This seemed ridiculous to me. So I removed it.
:::
:::
:::Thanks,
:::
::::Dave
::::
:::: I don't have the schematic but US made radios usually have a single diode for rectifier. European radios often used a bridge rectifier.
::::
:::: Have your tried replacing electrolytic filter caps? Increasing value?
::::
::::Norm
::::
:::::Norm.
::::: This is not what I was asking about. I wanted to know more about the power supply in the Arvin 32R98. Was it just the single diode I found or did it originally have a full wave rectifier?
:::::
:::::Thanks,
:::::
::::::Dave
::::::
:::::: 32ET5 has the same basing as 50C5 but lower filament voltage (32) and current (100 ma). A sub for 50C5 could be 50EH5 but I wouldn't try to use 32ET5.
::::::
:::::: http://www.nj7p.org/Tube4.php?tube=32ET5
::::::
::::::Norm
::::::
:::::::Edward,
::::::: I was asking if the 32ET5 in the Arvin radio is similar to a 50C5. I have never seen a 32ET5 before.
:::::::
:::::::Thanks,
:::::::
:::::::Dave
::::::::It appears not much is similar. Check out:
::::::::
::::::::http://datasheets.electron-tube.net/sheets/093/5/50C5.pdf
::::::::
::::::::12C5, 12Cu5, 17C5, 50B5 and 25C5 are somewhat similar but different heater voltages.
::::::::
::::::::Edward
::::::::
::::::::
::::::::
:::::::::Hello All,
::::::::: This set is in SAMs 647-5. Someone worked on the power supply but didn't do the work correctly. Does anyone
::::::::
::::::::schematic for the power supply section. I'm getting a lot more hum than I think I should be hearing. Was this originally full-wave rectified? I found only a single diode. There is a filter choke but they usually do better with full wave rectifiers.
::::::::: I would guess that those are 3 to 5 watt push pull amps. I've never seen that tube before. What is it similar to? (50C5?)
:::::::::
:::::::::Thanks,
:::::::::
:::::::::Dave

5/30/2007 9:55:39 PMEdd

Wellwaddayawannaknowaboutit....oops..pesky space bar !

Eeeeewweeee... seems like its circuitry incorporates a tuning eye tube, "perforated circuit bord", pushling pulling outputting amplifriers, stee-roo multiplexicating, larger 6 inch compliant speakers, the works.

As per your query on the SS device in the FM front end, the only thing up there is the varactor tuning diode for the AFC ... X2,
that is, unless one was piddling around and trying to sub in a silicon xstrs n-p junction for that application...look and see if the OEM diode is present in the circuitry.

Looks like it uses the four 32ET5's in series for one filament string along with an added filamant transformer and its secondary winding used autransformer series aiding in order to get the higher voltage needed in that strings voltage add up.
The rest of the common 150 ma string tubes are in yet another separate filament string.
Raw DC power is provided from a silicon diode rect... a.. la... 1/2 wave.

Tech schematic referencing au:

http://img46.imageshack.us/img46/6809/marvinsarvinaulefroelicmf2.jpg

(On the worlds largest Jpeg, I might add,.... made from two separate individual schemas....so mag it on up to size.)

73's de Edd

---------------------------------------------------------------------------------------------B/T---------------------------------------------------------------------------------------------

5/30/2007 11:01:16 PMDave Froehlich

Edd,
I see now, it's a filament transformer for the limiter and tuning indicator (the dial lamp too). But I have never seen one hooked up that way before. OK it's not so wierd. It does work that way.

With the way things are connected, adding a a diode bridge is impossible without a lot of re-wiring.

Thanks very very much for the schematic,

Dave
:Wellwaddayawannaknowaboutit....oops..pesky space bar !
:
:Eeeeewweeee... seems like its circuitry incorporates a tuning eye tube, "perforated circuit bord", pushling pulling outputting amplifriers, stee-roo multiplexicating, larger 6 inch compliant speakers, the works.
:
:As per your query on the SS device in the FM front end, the only thing up there is the varactor tuning diode for the AFC ... X2,
:that is, unless one was piddling around and trying to sub in a silicon xstrs n-p junction for that application...look and see if the OEM diode is present in the circuitry.
:
:Looks like it uses the four 32ET5's in series for one filament string along with an added filamant transformer and its secondary winding used autransformer series aiding in order to get the higher voltage needed in that strings voltage add up.
:The rest of the common 150 ma string tubes are in yet another separate filament string.
:Raw DC power is provided from a silicon diode rect... a.. la... 1/2 wave.
:
:Tech schematic referencing au:
:
:http://img46.imageshack.us/img46/6809/marvinsarvinaulefroelicmf2.jpg
:
:(On the worlds largest Jpeg, I might add,.... made from two separate individual schemas....so mag it on up to size.)
:
:73's de Edd
:
:---------------------------------------------------------------------------------------------B/T---------------------------------------------------------------------------------------------

6/9/2007 6:55:32 PMDave Froehlich

Edd,
I have given up on this set. Here are some of the reasons:

1. Three weird tube types.
2. Poorly designed power supply.
3. Poorly made PC board.
4. Weak audio amplifier.

Does anyone wanna buy it? Please let me know.

It has a nice wooden cabenet, two chassis and an external speaker. There are some cables with tube plugs on the ends and tube sockets for them. This set has a half wave rectifier, filter choke, and a filament transformer. It also has a tuning eye. It does work but the stereo decoder isn't working. Hum is heard especially on FM. All paper and filter capacitors have been replaced, as far as I can tell. There is still one large capacitor that looks like a brown orange drop type. There are two others, each says 10000 on it (.01 mf) and it's a clear case. Metal film can be seen inside. I think that these two are film type.

If the FM section was so elaborate, I wonder why the amplifier and power supply is so skimpy. It doesn't make any sense to me.

But it could be interesting for someone who likes very unusual radios.

Thanks,

Dave

There are 15 tubes in this radio.
:Edd,
: I see now, it's a filament transformer for the limiter and tuning indicator (the dial lamp too). But I have never seen one hooked up that way before. OK it's not so wierd. It does work that way.
:
:With the way things are connected, adding a a diode bridge is impossible without a lot of re-wiring.
:
:Thanks very very much for the schematic,
:
:Dave
::Wellwaddayawannaknowaboutit....oops..pesky space bar !
::
::Eeeeewweeee... seems like its circuitry incorporates a tuning eye tube, "perforated circuit bord", pushling pulling outputting amplifriers, stee-roo multiplexicating, larger 6 inch compliant speakers, the works.
::
::As per your query on the SS device in the FM front end, the only thing up there is the varactor tuning diode for the AFC ... X2,
::that is, unless one was piddling around and trying to sub in a silicon xstrs n-p junction for that application...look and see if the OEM diode is present in the circuitry.
::
::Looks like it uses the four 32ET5's in series for one filament string along with an added filamant transformer and its secondary winding used autransformer series aiding in order to get the higher voltage needed in that strings voltage add up.
::The rest of the common 150 ma string tubes are in yet another separate filament string.
::Raw DC power is provided from a silicon diode rect... a.. la... 1/2 wave.
::
::Tech schematic referencing au:
::
::http://img46.imageshack.us/img46/6809/marvinsarvinaulefroelicmf2.jpg
::
::(On the worlds largest Jpeg, I might add,.... made from two separate individual schemas....so mag it on up to size.)
::
::73's de Edd
::
::---------------------------------------------------------------------------------------------B/T---------------------------------------------------------------------------------------------

6/10/2007 3:02:12 AMStephen

I wonder if that radio company had surplus 32V tubes that they wanted to use up, and therefore made an unusual circuit.

:Edd,
: I see now, it's a filament transformer for the limiter and tuning indicator (the dial lamp too). But I have never seen one hooked up that way before. OK it's not so wierd. It does work that way.
:
:With the way things are connected, adding a a diode bridge is impossible without a lot of re-wiring.
:
:Thanks very very much for the schematic,
:
:Dave
::Wellwaddayawannaknowaboutit....oops..pesky space bar !
::
::Eeeeewweeee... seems like its circuitry incorporates a tuning eye tube, "perforated circuit bord", pushling pulling outputting amplifriers, stee-roo multiplexicating, larger 6 inch compliant speakers, the works.
::
::As per your query on the SS device in the FM front end, the only thing up there is the varactor tuning diode for the AFC ... X2,
::that is, unless one was piddling around and trying to sub in a silicon xstrs n-p junction for that application...look and see if the OEM diode is present in the circuitry.
::
::Looks like it uses the four 32ET5's in series for one filament string along with an added filamant transformer and its secondary winding used autransformer series aiding in order to get the higher voltage needed in that strings voltage add up.
::The rest of the common 150 ma string tubes are in yet another separate filament string.
::Raw DC power is provided from a silicon diode rect... a.. la... 1/2 wave.
::
::Tech schematic referencing au:
::
::http://img46.imageshack.us/img46/6809/marvinsarvinaulefroelicmf2.jpg
::
::(On the worlds largest Jpeg, I might add,.... made from two separate individual schemas....so mag it on up to size.)
::
::73's de Edd
::
::---------------------------------------------------------------------------------------------B/T---------------------------------------------------------------------------------------------