When I connect a standard 9v battery for the filaments it works perfectly. If I connect 4 AA cells 6 volts, that works too. But if I connect 6 AA cells, 9 volts, it overloads and distorts horribly. I have measured the voltages and all is well but the 6 AA cells will not work. It doesn't make any sense at all. Can anybody explain what's going on? A 9 volt rectangular battery works perfectly no distortion. But 6 AA cells won't.
They are brand new AA cells. All paper and electrolytic capacitors have been replaced. It works perfectly on AC, I replaced the rectifier too. This is very strange. I have restored many many of these sets and have never had such a strange problem. What's going on?
Thanks,
Dave
I would check the voltage UNDER LOAD of the 9 v battery when the filaments are connected. I'll bet it isnt 9 volts. What could be happening is the 9 v battery is getting loaded down and probably "looks" like a 6 volt battery, hence no distortion. You said the radio worked well with 6 volts on the filaments.
Then you connect the AA cells and they have more current capability, so the 9 V holds up. Sounds like something else is going on.
Lou
:Hello All,
: When I connect a standard 9v battery for the filaments it works perfectly. If I connect 4 AA cells 6 volts, that works too. But if I connect 6 AA cells, 9 volts, it overloads and distorts horribly. I have measured the voltages and all is well but the 6 AA cells will not work. It doesn't make any sense at all. Can anybody explain what's going on? A 9 volt rectangular battery works perfectly no distortion. But 6 AA cells won't.
: They are brand new AA cells. All paper and electrolytic capacitors have been replaced. It works perfectly on AC, I replaced the rectifier too. This is very strange. I have restored many many of these sets and have never had such a strange problem. What's going on?
:
:Thanks,
:
:Dave
:
Lou
:Hello All,
: When I connect a standard 9v battery for the filaments it works perfectly. If I connect 4 AA cells 6 volts, that works too. But if I connect 6 AA cells, 9 volts, it overloads and distorts horribly. I have measured the voltages and all is well but the 6 AA cells will not work. It doesn't make any sense at all. Can anybody explain what's going on? A 9 volt rectangular battery works perfectly no distortion. But 6 AA cells won't.
: They are brand new AA cells. All paper and electrolytic capacitors have been replaced. It works perfectly on AC, I replaced the rectifier too. This is very strange. I have restored many many of these sets and have never had such a strange problem. What's going on?
:
:Thanks,
:
:Dave
:
Under load it starts at 9.12 v and looses about .01 v per second.
4 AA cells under load is 6.12 volts. If it's on over 20 minutes the sound disappears. But then later if it can "rest" the sound returns.
6 AA cells 9.67 volts NL, 9.49 volts under load with horrible distortion.
Not sure what's going on.
:Ohh - you said you measured the voltages. Did you measure them under load?
:
:Lou
:
::Hello All,
:: When I connect a standard 9v battery for the filaments it works perfectly. If I connect 4 AA cells 6 volts, that works too. But if I connect 6 AA cells, 9 volts, it overloads and distorts horribly. I have measured the voltages and all is well but the 6 AA cells will not work. It doesn't make any sense at all. Can anybody explain what's going on? A 9 volt rectangular battery works perfectly no distortion. But 6 AA cells won't.
:: They are brand new AA cells. All paper and electrolytic capacitors have been replaced. It works perfectly on AC, I replaced the rectifier too. This is very strange. I have restored many many of these sets and have never had such a strange problem. What's going on?
::
::Thanks,
::
::Dave
::
:
:
: Under load it starts at 9.12 v and looses about .01 v per second.
:
:4 AA cells under load is 6.12 volts. If it's on over 20 minutes the sound disappears. But then later if it can "rest" the sound returns.
:
:6 AA cells 9.67 volts NL, 9.49 volts under load with horrible distortion.
:
:Not sure what's going on.
:
:
::Ohh - you said you measured the voltages. Did you measure them under load?
::
::Lou
::
:::Hello All,
::: When I connect a standard 9v battery for the filaments it works perfectly. If I connect 4 AA cells 6 volts, that works too. But if I connect 6 AA cells, 9 volts, it overloads and distorts horribly. I have measured the voltages and all is well but the 6 AA cells will not work. It doesn't make any sense at all. Can anybody explain what's going on? A 9 volt rectangular battery works perfectly no distortion. But 6 AA cells won't.
::: They are brand new AA cells. All paper and electrolytic capacitors have been replaced. It works perfectly on AC, I replaced the rectifier too. This is very strange. I have restored many many of these sets and have never had such a strange problem. What's going on?
:::
:::Thanks,
:::
:::Dave
:::
::
::
:
:
Dave,
Try it with 5 AA cells, 7.5 Volts. Tell us what the results are.
If you have variable supply use it to change voltages. Start at ten volts and work down until the sounds good.
9.5 volts could be too much and is overdriving the circuit.
Mitch
Tried an external power supply set to 9 V?
Lou
:New 9 volt rectangular battery No Load 10v
: Under load it starts at 9.12 v and looses about .01 v per second.
:
:4 AA cells under load is 6.12 volts. If it's on over 20 minutes the sound disappears. But then later if it can "rest" the sound returns.
:
:6 AA cells 9.67 volts NL, 9.49 volts under load with horrible distortion.
:
:Not sure what's going on.
:
:
::Ohh - you said you measured the voltages. Did you measure them under load?
::
::Lou
::
:::Hello All,
::: When I connect a standard 9v battery for the filaments it works perfectly. If I connect 4 AA cells 6 volts, that works too. But if I connect 6 AA cells, 9 volts, it overloads and distorts horribly. I have measured the voltages and all is well but the 6 AA cells will not work. It doesn't make any sense at all. Can anybody explain what's going on? A 9 volt rectangular battery works perfectly no distortion. But 6 AA cells won't.
::: They are brand new AA cells. All paper and electrolytic capacitors have been replaced. It works perfectly on AC, I replaced the rectifier too. This is very strange. I have restored many many of these sets and have never had such a strange problem. What's going on?
:::
:::Thanks,
:::
:::Dave
:::
::
::
:
:
Tried an external power supply set to 9 V?
Lou
:New 9 volt rectangular battery No Load 10v
: Under load it starts at 9.12 v and looses about .01 v per second.
:
:4 AA cells under load is 6.12 volts. If it's on over 20 minutes the sound disappears. But then later if it can "rest" the sound returns.
:
:6 AA cells 9.67 volts NL, 9.49 volts under load with horrible distortion.
:
:Not sure what's going on.
:
:
::Ohh - you said you measured the voltages. Did you measure them under load?
::
::Lou
::
:::Hello All,
::: When I connect a standard 9v battery for the filaments it works perfectly. If I connect 4 AA cells 6 volts, that works too. But if I connect 6 AA cells, 9 volts, it overloads and distorts horribly. I have measured the voltages and all is well but the 6 AA cells will not work. It doesn't make any sense at all. Can anybody explain what's going on? A 9 volt rectangular battery works perfectly no distortion. But 6 AA cells won't.
::: They are brand new AA cells. All paper and electrolytic capacitors have been replaced. It works perfectly on AC, I replaced the rectifier too. This is very strange. I have restored many many of these sets and have never had such a strange problem. What's going on?
:::
:::Thanks,
:::
:::Dave
:::
::
::
:
:
Tried an external power supply set to 9 V?
Lou
:New 9 volt rectangular battery No Load 10v
: Under load it starts at 9.12 v and looses about .01 v per second.
:
:4 AA cells under load is 6.12 volts. If it's on over 20 minutes the sound disappears. But then later if it can "rest" the sound returns.
:
:6 AA cells 9.67 volts NL, 9.49 volts under load with horrible distortion.
:
:Not sure what's going on.
:
:
::Ohh - you said you measured the voltages. Did you measure them under load?
::
::Lou
::
:::Hello All,
::: When I connect a standard 9v battery for the filaments it works perfectly. If I connect 4 AA cells 6 volts, that works too. But if I connect 6 AA cells, 9 volts, it overloads and distorts horribly. I have measured the voltages and all is well but the 6 AA cells will not work. It doesn't make any sense at all. Can anybody explain what's going on? A 9 volt rectangular battery works perfectly no distortion. But 6 AA cells won't.
::: They are brand new AA cells. All paper and electrolytic capacitors have been replaced. It works perfectly on AC, I replaced the rectifier too. This is very strange. I have restored many many of these sets and have never had such a strange problem. What's going on?
:::
:::Thanks,
:::
:::Dave
:::
::
::
:
:
What is the voltage that is SUPPOSED to be supplied to the unit for the filaments from the external battery?
Thanks
Lou
:OK - I am going to have to THINK about that one.
:
:Tried an external power supply set to 9 V?
:
:Lou
:
::New 9 volt rectangular battery No Load 10v
:: Under load it starts at 9.12 v and looses about .01 v per second.
::
::4 AA cells under load is 6.12 volts. If it's on over 20 minutes the sound disappears. But then later if it can "rest" the sound returns.
::
::6 AA cells 9.67 volts NL, 9.49 volts under load with horrible distortion.
::
::Not sure what's going on.
::
::
:::Ohh - you said you measured the voltages. Did you measure them under load?
:::
:::Lou
:::
::::Hello All,
:::: When I connect a standard 9v battery for the filaments it works perfectly. If I connect 4 AA cells 6 volts, that works too. But if I connect 6 AA cells, 9 volts, it overloads and distorts horribly. I have measured the voltages and all is well but the 6 AA cells will not work. It doesn't make any sense at all. Can anybody explain what's going on? A 9 volt rectangular battery works perfectly no distortion. But 6 AA cells won't.
:::: They are brand new AA cells. All paper and electrolytic capacitors have been replaced. It works perfectly on AC, I replaced the rectifier too. This is very strange. I have restored many many of these sets and have never had such a strange problem. What's going on?
::::
::::Thanks,
::::
::::Dave
::::
:::
:::
::
::
:
:
The voltage is supposed to be 9 volts.
Dave
:Dave - lets start here.
:
:What is the voltage that is SUPPOSED to be supplied to the unit for the filaments from the external battery?
:
:Thanks
:Lou
:
::OK - I am going to have to THINK about that one.
::
::Tried an external power supply set to 9 V?
::
::Lou
::
:::New 9 volt rectangular battery No Load 10v
::: Under load it starts at 9.12 v and looses about .01 v per second.
:::
:::4 AA cells under load is 6.12 volts. If it's on over 20 minutes the sound disappears. But then later if it can "rest" the sound returns.
:::
:::6 AA cells 9.67 volts NL, 9.49 volts under load with horrible distortion.
:::
:::Not sure what's going on.
:::
:::
::::Ohh - you said you measured the voltages. Did you measure them under load?
::::
::::Lou
::::
:::::Hello All,
::::: When I connect a standard 9v battery for the filaments it works perfectly. If I connect 4 AA cells 6 volts, that works too. But if I connect 6 AA cells, 9 volts, it overloads and distorts horribly. I have measured the voltages and all is well but the 6 AA cells will not work. It doesn't make any sense at all. Can anybody explain what's going on? A 9 volt rectangular battery works perfectly no distortion. But 6 AA cells won't.
::::: They are brand new AA cells. All paper and electrolytic capacitors have been replaced. It works perfectly on AC, I replaced the rectifier too. This is very strange. I have restored many many of these sets and have never had such a strange problem. What's going on?
:::::
:::::Thanks,
:::::
:::::Dave
:::::
::::
::::
:::
:::
::
::
:
:
You may need to check the resistors across the tube filaments and the resistor to the centertap of the 3V4 as well as any high value resistors such as 4.7 meg, 5.6 meg, 10 meg and etc that are in the bias and avc circuit. If the 200uf cap was replaced, be sure of it's polarity in the circuit.
Clifton
:New 9 volt rectangular battery No Load 10v
: Under load it starts at 9.12 v and looses about .01 v per second.
:
:4 AA cells under load is 6.12 volts. If it's on over 20 minutes the sound disappears. But then later if it can "rest" the sound returns.
:
:6 AA cells 9.67 volts NL, 9.49 volts under load with horrible distortion.
:
:Not sure what's going on.
:
:
::Ohh - you said you measured the voltages. Did you measure them under load?
::
::Lou
::
:::Hello All,
::: When I connect a standard 9v battery for the filaments it works perfectly. If I connect 4 AA cells 6 volts, that works too. But if I connect 6 AA cells, 9 volts, it overloads and distorts horribly. I have measured the voltages and all is well but the 6 AA cells will not work. It doesn't make any sense at all. Can anybody explain what's going on? A 9 volt rectangular battery works perfectly no distortion. But 6 AA cells won't.
::: They are brand new AA cells. All paper and electrolytic capacitors have been replaced. It works perfectly on AC, I replaced the rectifier too. This is very strange. I have restored many many of these sets and have never had such a strange problem. What's going on?
:::
:::Thanks,
:::
:::Dave
:::
::
::
:
:
Thanks for helping. I solved the problem. Let's see if you can tell what I was doing wrong. RS no longer carries the holder for 6 AA cells with the 9v battery clip. So I used three 9v battery clips to connect the 4 AA cell and the 2 AA cell holder in series. Then I attached the third 9v battery clip to connect to the 9 volt battery clip I soldered inside the battery connector. I now know why it was distorting and why it works well now.
I'll let you guess and I'll tell you what I did if nobody figures it out.
Thanks again,
Dave
:New 9 volt rectangular battery No Load 10v
: Under load it starts at 9.12 v and looses about .01 v per second.
:
:4 AA cells under load is 6.12 volts. If it's on over 20 minutes the sound disappears. But then later if it can "rest" the sound returns.
:
:6 AA cells 9.67 volts NL, 9.49 volts under load with horrible distortion.
:
:Not sure what's going on.
:
:
::Ohh - you said you measured the voltages. Did you measure them under load?
::
::Lou
::
:::Hello All,
::: When I connect a standard 9v battery for the filaments it works perfectly. If I connect 4 AA cells 6 volts, that works too. But if I connect 6 AA cells, 9 volts, it overloads and distorts horribly. I have measured the voltages and all is well but the 6 AA cells will not work. It doesn't make any sense at all. Can anybody explain what's going on? A 9 volt rectangular battery works perfectly no distortion. But 6 AA cells won't.
::: They are brand new AA cells. All paper and electrolytic capacitors have been replaced. It works perfectly on AC, I replaced the rectifier too. This is very strange. I have restored many many of these sets and have never had such a strange problem. What's going on?
:::
:::Thanks,
:::
:::Dave
:::
::
::
:
:
Sir Dave . . . .
GOOD SHOW . . . on gettin' the'ole dude wukkin' agin !
With YOUR hooking up a set of (4) AA and then a separate set of (2) AA batts ALONG with the additional possibilities of error, that YOUR then interconnecting them with (3) leaded battery connectors might incur.
You think that . . . . WE . . . are supposed to solve " Froehlich's Folly " !
Lets consider some possibilities:
You found that the set WILL will work OK . . .undistorted . . . on as low as a 6 V filament supply level.
On the interconnection to the 3rd battery connector, and supposedly, it being soldered into ( inside ? ) the battery holder, you couldn't have cross connected 2 sets of cells or the resultant current would have some wires smoking.
The next posssibility would you be having added the 2 cells in series with the 4 cells but having messed up on the polarity of the connections.
INTERJECTION:
Gotta' watch out when you are juxtaposing multiple 9 Volt battery connectors. You are going to find the stud of the battery proper is always going to be the + terminial and the female receptacle being the - terminal.
But when you get to inter joining just the leaded battery connectors, you really have to watch and keep up with the polarity of interconnects !
That could possibly be having the 2 cells in opposite polarity so that instead of being in series AIDING mode, they are in series OPPOSING mode, such that the 2 cells voltage don't even add in and end up with only 6V coming out of the series string of 6 cells.
BUT that error would be readily apparent IF the TOTAL voltage was checked / measured.
Another factor that involves with those two "transparent" cells being in the mix , would be the UNDESIRED series resistance / isolation that they are introducing into the whole battery supply loop.
Lastly, would be that if the battery connectors end(s) which actually ties into the radio proper is being of REVERSE polarity.
Now, the not so fussy tube filaments might tolerate that, but the different 1st grid biasing, of the different tubes that rely on the tapping in at different points on the series strung filaments, just might revolt at the opposite polarities now being sent to them.
Along with messing up of the biased low end of the volume control, along with the AVC circuitry.
That's the best that I can visualize without seeing the unit and with the little provided info.
73's de Edd
IF A TURTLE DOESN'T HAVE A SHELL, IS HE HOMELESS OR NAKED?
:Hello All,
: Thanks for helping. I solved the problem. Let's see if you can tell what I was doing wrong. RS no longer carries the holder for 6 AA cells with the 9v battery clip. So I used three 9v battery clips to connect the 4 AA cell and the 2 AA cell holder in series. Then I attached the third 9v battery clip to connect to the 9 volt battery clip I soldered inside the battery connector. I now know why it was distorting and why it works well now.
: I'll let you guess and I'll tell you what I did if nobody figures it out.
:
:Thanks again,
:
:Dave
::New 9 volt rectangular battery No Load 10v
:: Under load it starts at 9.12 v and looses about .01 v per second.
::
::4 AA cells under load is 6.12 volts. If it's on over 20 minutes the sound disappears. But then later if it can "rest" the sound returns.
::
::6 AA cells 9.67 volts NL, 9.49 volts under load with horrible distortion.
::
::Not sure what's going on.
::
::
:::Ohh - you said you measured the voltages. Did you measure them under load?
:::
:::Lou
::::Hello All,
:::: When I connect a standard 9v battery for the filaments it works perfectly. If I connect 4 AA cells 6 volts, that works too. But if I connect 6 AA cells, 9 volts, it overloads and distorts horribly. I have measured the voltages and all is well but the 6 AA cells will not work. It doesn't make any sense at all. Can anybody explain what's going on? A 9 volt rectangular battery works perfectly no distortion. But 6 AA cells won't.
:::: They are brand new AA cells. All paper and electrolytic capacitors have been replaced. It works perfectly on AC, I replaced the rectifier too. This is very strange. I have restored many many of these sets and have never had such a strange problem. What's going on?
::::
::::Thanks,
::::
::::Dave
::::
:::
:::
::
::
:
:
That is correct. I connected the last battery clip backwards. I have to reverse the wires if I want it to be the same way as it is on a 9v battery. So I corrected my mistake and the radio works great, just like it did with the 9v battery.
When using tubes that do not have a separate cathode, where the filament is also the cathode, polarity is important. I doubt that this would hurt the tubes, but it doesn't work that way, as Lee DeForest discovered.
Dave
Dave
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:Sir Dave . . . .
:
:
:GOOD SHOW . . . on gettin' the'ole dude wukkin' agin !
:
:
:
:With YOUR hooking up a set of (4) AA and then a separate set of (2) AA batts ALONG with the additional possibilities of error, that YOUR then interconnecting them with (3) leaded battery connectors might incur.
:
:
:You think that . . . . WE . . . are supposed to solve " Froehlich's Folly " !
:
:
:Lets consider some possibilities:
:
:
:You found that the set WILL will work OK . . .undistorted . . . on as low as a 6 V filament supply level.
:
:
:On the interconnection to the 3rd battery connector, and supposedly, it being soldered into ( inside ? ) the battery holder, you couldn't have cross connected 2 sets of cells or the resultant current would have some wires smoking.
:
:
:The next posssibility would you be having added the 2 cells in series with the 4 cells but having messed up on the polarity of the connections.
:
:
:INTERJECTION:
:
:
:Gotta' watch out when you are juxtaposing multiple 9 Volt battery connectors. You are going to find the stud of the battery proper is always going to be the + terminial and the female receptacle being the - terminal.
:But when you get to inter joining just the leaded battery connectors, you really have to watch and keep up with the polarity of interconnects !
:
:
:
:That could possibly be having the 2 cells in opposite polarity so that instead of being in series AIDING mode, they are in series OPPOSING mode, such that the 2 cells voltage don't even add in and end up with only 6V coming out of the series string of 6 cells.
:
:
:BUT that error would be readily apparent IF the TOTAL voltage was checked / measured.
:
:
:Another factor that involves with those two "transparent" cells being in the mix , would be the UNDESIRED series resistance / isolation that they are introducing into the whole battery supply loop.
:
:
:Lastly, would be that if the battery connectors end(s) which actually ties into the radio proper is being of REVERSE polarity.
:
:
:Now, the not so fussy tube filaments might tolerate that, but the different 1st grid biasing, of the different tubes that rely on the tapping in at different points on the series strung filaments, just might revolt at the opposite polarities now being sent to them.
:
:
:Along with messing up of the biased low end of the volume control, along with the AVC circuitry.
:
:
:That's the best that I can visualize without seeing the unit and with the little provided info.
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:
:73's de Edd
:
:
:
:
:
:IF A TURTLE DOESN'T HAVE A SHELL, IS HE HOMELESS OR NAKED?
:
:
:
:
:
:
:
:
:
:
:
:
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::Hello All,
:: Thanks for helping. I solved the problem. Let's see if you can tell what I was doing wrong. RS no longer carries the holder for 6 AA cells with the 9v battery clip. So I used three 9v battery clips to connect the 4 AA cell and the 2 AA cell holder in series. Then I attached the third 9v battery clip to connect to the 9 volt battery clip I soldered inside the battery connector. I now know why it was distorting and why it works well now.
:: I'll let you guess and I'll tell you what I did if nobody figures it out.
::
::Thanks again,
::
::Dave
:::New 9 volt rectangular battery No Load 10v
::: Under load it starts at 9.12 v and looses about .01 v per second.
:::
:::4 AA cells under load is 6.12 volts. If it's on over 20 minutes the sound disappears. But then later if it can "rest" the sound returns.
:::
:::6 AA cells 9.67 volts NL, 9.49 volts under load with horrible distortion.
:::
:::Not sure what's going on.
:::
:::
::::Ohh - you said you measured the voltages. Did you measure them under load?
::::
::::Lou
:
:::::Hello All,
::::: When I connect a standard 9v battery for the filaments it works perfectly. If I connect 4 AA cells 6 volts, that works too. But if I connect 6 AA cells, 9 volts, it overloads and distorts horribly. I have measured the voltages and all is well but the 6 AA cells will not work. It doesn't make any sense at all. Can anybody explain what's going on? A 9 volt rectangular battery works perfectly no distortion. But 6 AA cells won't.
::::: They are brand new AA cells. All paper and electrolytic capacitors have been replaced. It works perfectly on AC, I replaced the rectifier too. This is very strange. I have restored many many of these sets and have never had such a strange problem. What's going on?
:::::
:::::Thanks,
:::::
:::::Dave
:::::
::::
::::
:::
:::
::
::
:
: