Hello to everyone,

I have a GE radio that uses a 12SK7 and the previous owner installed a 12BA6 in place of it, will this work in the radio?

Thank you,

Mitch

:Hello to everyone,
:
:I have a GE radio that uses a 12SK7 and the previous owner installed a 12BA6 in place of it, will this work in the radio?
:
:Thank you,
:
:Mitch
:
I know it looks confusing, the GE is model 67, a clock radio and it does have the 12BA6 7 pin tube installed in it, perhaps i do not have the right schematic.

The 12SA7 OSC-CONV octal tube does have an open filament. I will need to change the plumbers filter capacitors before i proceed with the restoration.

Anyone know of a different schematic for this model that used 7 pin mini tubes?

Thank you,

Mitch

Mitch

12BA6 is a 7 pin miniature tube equlivent to 12SK7. Some manufactures used what was available after WW2. Does resistor and caps match the sehematic?

Norm

::Hello to everyone,
::
::I have a GE radio that uses a 12SK7 and the previous owner installed a 12BA6 in place of it, will this work in the radio?
::
::Thank you,
::
::Mitch
::
:I know it looks confusing, the GE is model 67, a clock radio and it does have the 12BA6 7 pin tube installed in it, perhaps i do not have the right schematic.
:
:The 12SA7 OSC-CONV octal tube does have an open filament. I will need to change the plumbers filter capacitors before i proceed with the restoration.
:
:Anyone know of a different schematic for this model that used 7 pin mini tubes?
:
:Thank you,
:
:Mitch
:

:Mitch
:
: 12BA6 is a 7 pin miniature tube equlivent to 12SK7. Some manufactures used what was available after WW2. Does resistor and caps match the sehematic?
:
:Norm
:
:::Hello to everyone,
:::
:::I have a GE radio that uses a 12SK7 and the previous owner installed a 12BA6 in place of it, will this work in the radio?
:::
:::Thank you,
:::
:::Mitch
:::
::I know it looks confusing, the GE is model 67, a clock radio and it does have the 12BA6 7 pin tube installed in it, perhaps i do not have the right schematic.
::
::The 12SA7 OSC-CONV octal tube does have an open filament. I will need to change the plumbers filter capacitors before i proceed with the restoration.
::
::Anyone know of a different schematic for this model that used 7 pin mini tubes?
::
::Thank you,
::
::Mitch
::
:
:
Hello again and thank you Norm,

I did check the circuit and the power resistor was correct as well as the filter capacitor ratings.

The FYI is this for the new people, power the radio up with a isolation transformer and variac/ watt meter. Bring the voltage up slowly and watch the wattage, too much past 60 watts is just too much.

I changed the filter capacitors and the 12SA7 tube and brought the radio up with the explained process. No high current and very low wattage.

At 60 volts the radio began to play stations. at 120 volts the radio drew 30 watts and the clock began to keep time.

I have some paper/wax capacitors to replace to give this radio another 60 year life.

If there is another schematic for this radio i would appricate to see it, but for now all is well.

Thank you all,

Mitch

::Mitch
::
:: 12BA6 is a 7 pin miniature tube equlivent to 12SK7. Some manufactures used what was available after WW2. Does resistor and caps match the sehematic?
::
::Norm
::
::::Hello to everyone,
::::
::::I have a GE radio that uses a 12SK7 and the previous owner installed a 12BA6 in place of it, will this work in the radio?
::::
::::Thank you,
::::
::::Mitch
::::
:::I know it looks confusing, the GE is model 67, a clock radio and it does have the 12BA6 7 pin tube installed in it, perhaps i do not have the right schematic.
:::
:::The 12SA7 OSC-CONV octal tube does have an open filament. I will need to change the plumbers filter capacitors before i proceed with the restoration.
:::
:::Anyone know of a different schematic for this model that used 7 pin mini tubes?
:::
:::Thank you,
:::
:::Mitch
:::
::
::
:Hello again and thank you Norm,
:
:I did check the circuit and the power resistor was correct as well as the filter capacitor ratings.
:
:The FYI is this for the new people, power the radio up with a isolation transformer and variac/ watt meter. Bring the voltage up slowly and watch the wattage, too much past 60 watts is just too much.
:
:I changed the filter capacitors and the 12SA7 tube and brought the radio up with the explained process. No high current and very low wattage.
:
:At 60 volts the radio began to play stations. at 120 volts the radio drew 30 watts and the clock began to keep time.
:
:I have some paper/wax capacitors to replace to give this radio another 60 year life.
:
:If there is another schematic for this radio i would appricate to see it, but for now all is well.
:
:Thank you all,
:
:Mitch
:
:
:Hi! Mitch.
If you copy and paste this:
http://antiqueradios.com/archive.shtml
it will take you to a site where you can download a " GE Radio Service Guide 1946-1956".
It has a schematic for the model 67 which shows a late production change where a 35W4 was put in. It looks like they were in transistion to miniature tubes at the time.So I think yours had a late production change also.
Bob Masse
:
: