Thanks,
John
Does your radio use 7 pin miniature tubes? If so the radio should match RE278-1 except smaller tubes and different pin numbers.
http://techpreservation.dyndns.org/schematics/55/55_Arvin_840T_11.djvu
You can find tube pinouts here:
http://tdsl.duncanamps.com/tubesearch.php
Norm
:I have an ARvin 840T. The chassis is an RE278-2. Does anyone have information on this chassis. The common chassis is RE278-1. They are definitely different. I have the schematic for the RE278-1. Any help would be appreciated. Please email me at jdasconio@comcast.net
:
:Thanks,
:John
It does have miniatures, the issue I have is the caps are not the same as the RE278-1. I am trying to verify the cap that goes from pin 1 to the volume control. The tube is 35W4. I am definitely out of my league on electronics.
John
:Hi John
:
: Does your radio use 7 pin miniature tubes? If so the radio should match RE278-1 except smaller tubes and different pin numbers.
:
:http://techpreservation.dyndns.org/schematics/55/55_Arvin_840T_11.djvu
:
: You can find tube pinouts here:
:
:http://tdsl.duncanamps.com/tubesearch.php
:
:Norm
:
::I have an ARvin 840T. The chassis is an RE278-2. Does anyone have information on this chassis. The common chassis is RE278-1. They are definitely different. I have the schematic for the RE278-1. Any help would be appreciated. Please email me at jdasconio@comcast.net
::
::Thanks,
::John
You will get there but first we need to find where pin #1 of the 35W4 connects? It must be used as a tie point as this pin has no internal connection to the tube.
Important caps to replace are electrolytics identified as C7 in 840T schematic. They are identified as 20 mf, 20 mf and 40 mf. All will be in one unit. Most likely a cardboard cylinder under the chassis with 4 wires. These dry out over time, cause hum and can short. Use individual units for these, 22 mf, 22 mf and 47 mf @ 160 volts.
There is a .002 mf from center terminal of the volume control to pin #1 on 12AT6 or 12AV6. Are tubes in the right sockets?
Norm
:Thanks Norm,
:
:It does have miniatures, the issue I have is the caps are not the same as the RE278-1. I am trying to verify the cap that goes from pin 1 to the volume control. The tube is 35W4. I am definitely out of my league on electronics.
:
:John
:
::Hi John
::
:: Does your radio use 7 pin miniature tubes? If so the radio should match RE278-1 except smaller tubes and different pin numbers.
::
::http://techpreservation.dyndns.org/schematics/55/55_Arvin_840T_11.djvu
::
:: You can find tube pinouts here:
::
::http://tdsl.duncanamps.com/tubesearch.php
::
::Norm
::
:::I have an ARvin 840T. The chassis is an RE278-2. Does anyone have information on this chassis. The common chassis is RE278-1. They are definitely different. I have the schematic for the RE278-1. Any help would be appreciated. Please email me at jdasconio@comcast.net
:::
:::Thanks,
:::John
Let me first say thank you. So here we go. The schematic from the link and the Sams schematic are different. The tubes are the same but the wiring is different. The electrolytics on the Sams is C1. The layout on Radio is more like the Sams photofact that I have here.So after all that let me say, the cap I'm interested in is from tube 35W4 pin 7, not pin 1. It goes to the on/off switch. It is an electrolytic 3 wire and only the black and green are used. 50 mfd 150wvdc. Other than C1 which is 40/20/20 I see no other cap in the schematic that is that large. It is the only cap on the radio that has been replaced and I assume it;s not the correct cap.
And yes all the tubes are in the right socket. I admit I am an old rookie, but I have that part down. lol
:Hi John
:
: You will get there but first we need to find where pin #1 of the 35W4 connects? It must be used as a tie point as this pin has no internal connection to the tube.
:
: Important caps to replace are electrolytics identified as C7 in 840T schematic. They are identified as 20 mf, 20 mf and 40 mf. All will be in one unit. Most likely a cardboard cylinder under the chassis with 4 wires. These dry out over time, cause hum and can short. Use individual units for these, 22 mf, 22 mf and 47 mf @ 160 volts.
:
: There is a .002 mf from center terminal of the volume control to pin #1 on 12AT6 or 12AV6. Are tubes in the right sockets?
:
:Norm
:
::Thanks Norm,
::
::It does have miniatures, the issue I have is the caps are not the same as the RE278-1. I am trying to verify the cap that goes from pin 1 to the volume control. The tube is 35W4. I am definitely out of my league on electronics.
::
::John
::
:::Hi John
:::
::: Does your radio use 7 pin miniature tubes? If so the radio should match RE278-1 except smaller tubes and different pin numbers.
:::
:::http://techpreservation.dyndns.org/schematics/55/55_Arvin_840T_11.djvu
:::
::: You can find tube pinouts here:
:::
:::http://tdsl.duncanamps.com/tubesearch.php
:::
:::Norm
:::
::::I have an ARvin 840T. The chassis is an RE278-2. Does anyone have information on this chassis. The common chassis is RE278-1. They are definitely different. I have the schematic for the RE278-1. Any help would be appreciated. Please email me at jdasconio@comcast.net
::::
::::Thanks,
::::John
That would be the first electrolytic cap. Someone has replaced the original with 50 mf. Exact value isn't critical. Use a 47mf @ 160 volts, modern standard value.
Norm
:Norm,
:
:Let me first say thank you. So here we go. The schematic from the link and the Sams schematic are different. The tubes are the same but the wiring is different. The electrolytics on the Sams is C1. The layout on Radio is more like the Sams photofact that I have here.So after all that let me say, the cap I'm interested in is from tube 35W4 pin 7, not pin 1. It goes to the on/off switch. It is an electrolytic 3 wire and only the black and green are used. 50 mfd 150wvdc. Other than C1 which is 40/20/20 I see no other cap in the schematic that is that large. It is the only cap on the radio that has been replaced and I assume it;s not the correct cap.
:And yes all the tubes are in the right socket. I admit I am an old rookie, but I have that part down. lol
:
:
:
::Hi John
::
:: You will get there but first we need to find where pin #1 of the 35W4 connects? It must be used as a tie point as this pin has no internal connection to the tube.
::
:: Important caps to replace are electrolytics identified as C7 in 840T schematic. They are identified as 20 mf, 20 mf and 40 mf. All will be in one unit. Most likely a cardboard cylinder under the chassis with 4 wires. These dry out over time, cause hum and can short. Use individual units for these, 22 mf, 22 mf and 47 mf @ 160 volts.
::
:: There is a .002 mf from center terminal of the volume control to pin #1 on 12AT6 or 12AV6. Are tubes in the right sockets?
::
::Norm
::
:::Thanks Norm,
:::
:::It does have miniatures, the issue I have is the caps are not the same as the RE278-1. I am trying to verify the cap that goes from pin 1 to the volume control. The tube is 35W4. I am definitely out of my league on electronics.
:::
:::John
:::
::::Hi John
::::
:::: Does your radio use 7 pin miniature tubes? If so the radio should match RE278-1 except smaller tubes and different pin numbers.
::::
::::http://techpreservation.dyndns.org/schematics/55/55_Arvin_840T_11.djvu
::::
:::: You can find tube pinouts here:
::::
::::http://tdsl.duncanamps.com/tubesearch.php
::::
::::Norm
::::
:::::I have an ARvin 840T. The chassis is an RE278-2. Does anyone have information on this chassis. The common chassis is RE278-1. They are definitely different. I have the schematic for the RE278-1. Any help would be appreciated. Please email me at jdasconio@comcast.net
:::::
:::::Thanks,
:::::John
:John
:
: That would be the first electrolytic cap. Someone has replaced the original with 50 mf. Exact value isn't critical. Use a 47mf @ 160 volts, modern standard value.
:
:Norm
:
:
:
::Norm,
::
::Let me first say thank you. So here we go. The schematic from the link and the Sams schematic are different. The tubes are the same but the wiring is different. The electrolytics on the Sams is C1. The layout on Radio is more like the Sams photofact that I have here.So after all that let me say, the cap I'm interested in is from tube 35W4 pin 7, not pin 1. It goes to the on/off switch. It is an electrolytic 3 wire and only the black and green are used. 50 mfd 150wvdc. Other than C1 which is 40/20/20 I see no other cap in the schematic that is that large. It is the only cap on the radio that has been replaced and I assume it;s not the correct cap.
::And yes all the tubes are in the right socket. I admit I am an old rookie, but I have that part down. lol
::
::
::
:::Hi John
:::
::: You will get there but first we need to find where pin #1 of the 35W4 connects? It must be used as a tie point as this pin has no internal connection to the tube.
:::
::: Important caps to replace are electrolytics identified as C7 in 840T schematic. They are identified as 20 mf, 20 mf and 40 mf. All will be in one unit. Most likely a cardboard cylinder under the chassis with 4 wires. These dry out over time, cause hum and can short. Use individual units for these, 22 mf, 22 mf and 47 mf @ 160 volts.
:::
::: There is a .002 mf from center terminal of the volume control to pin #1 on 12AT6 or 12AV6. Are tubes in the right sockets?
:::
:::Norm
:::
::::Thanks Norm,
::::
::::It does have miniatures, the issue I have is the caps are not the same as the RE278-1. I am trying to verify the cap that goes from pin 1 to the volume control. The tube is 35W4. I am definitely out of my league on electronics.
::::
::::John
::::
:::::Hi John
:::::
::::: Does your radio use 7 pin miniature tubes? If so the radio should match RE278-1 except smaller tubes and different pin numbers.
:::::
:::::http://techpreservation.dyndns.org/schematics/55/55_Arvin_840T_11.djvu
:::::
::::: You can find tube pinouts here:
:::::
:::::http://tdsl.duncanamps.com/tubesearch.php
:::::
:::::Norm
:::::
::::::I have an ARvin 840T. The chassis is an RE278-2. Does anyone have information on this chassis. The common chassis is RE278-1. They are definitely different. I have the schematic for the RE278-1. Any help would be appreciated. Please email me at jdasconio@comcast.net
::::::
::::::Thanks,
::::::John