I need a 7b7 tube to fix a radio and I can't locate one, My subtitute manual says a 7t7 or a 7aj7 will work. They are both available and cheap, would I have any problems using either one as a sub? would one be better than the other?

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:I need a 7b7 tube to fix a radio and I can't locate one, My subtitute manual says a 7t7 or a 7aj7 will work. They are both available and cheap, would I have any problems using either one as a sub? would one be better than the other?

Hi

These tubes may not be interchangeable in your radio?

A 7B7 has 150 ma filament current. If this tube is used in an AC/DC radio 7T7 and 7AJ7 won't work. Their filaments draw 300 ma. These tubes won't light in a series wired filament radio.

If not sure about the type, listing tubes will identify an AC/DC radio.

There are plenty of interchangeable loctal tubes, tubes starting with "7".

If you don't find a tube send me your address.

Norm

:I like this business: http://www.radiotubesupply.com/Tubecatalog/catalog3.html
:
:Good service and good prices.
:
:
::I need a 7b7 tube to fix a radio and I can't locate one, My subtitute manual says a 7t7 or a 7aj7 will work. They are both available and cheap, would I have any problems using either one as a sub? would one be better than the other?

:Hi
:
: These tubes may not be interchangeable in your radio?
:
: A 7B7 has 150 ma filament current. If this tube is used in an AC/DC radio 7T7 and 7AJ7 won't work. Their filaments draw 300 ma. These tubes won't light in a series wired filament radio.
:
: If not sure about the type, listing tubes will identify an AC/DC radio.
:
: There are plenty of interchangeable loctal tubes, tubes starting with "7".
:
: If you don't find a tube send me your address.
:
:Norm
:
::I like this business: http://www.radiotubesupply.com/Tubecatalog/catalog3.html
::
::Good service and good prices.
::
::
:::I need a 7b7 tube to fix a radio and I can't locate one, My subtitute manual says a 7t7 or a 7aj7 will work. They are both available and cheap, would I have any problems using either one as a sub? would one be better than the other?

I should have mentioned that in the tube substitution book I have a 7T7 and 7AJ7 are not listed as subs. A 7AH7 is considered a sub. Tubes 7A7, 7A7LM, and 7H7 is listed as ok for parallel-filament circuits. I do recall having problems sometimes for other tubes when subs are listed as ok for parallel filaments. It does gets a little testy determining correct subs. Getting a 7B7 is best bet.

:Hi
::
:: These tubes may not be interchangeable in your radio?
::
:: A 7B7 has 150 ma filament current. If this tube is used in an AC/DC radio 7T7 and 7AJ7 won't work. Their filaments draw 300 ma. These tubes won't light in a series wired filament radio.
::
:: If not sure about the type, listing tubes will identify an AC/DC radio.
::
:: There are plenty of interchangeable loctal tubes, tubes starting with "7".
::
:: If you don't find a tube send me your address.
::
::Norm
::
:::I like this business: http://www.radiotubesupply.com/Tubecatalog/catalog3.html
:::
:::Good service and good prices.
:::
:::
::::I need a 7b7 tube to fix a radio and I can't locate one, My subtitute manual says a 7t7 or a 7aj7 will work. They are both available and cheap, would I have any problems using either one as a sub? would one be better than the other?

:I need a 7b7 tube to fix a radio and I can't locate one, My subtitute manual says a 7t7 or a 7aj7 will work. They are both available and cheap, would I have any problems using either one as a sub? would one be better than the other

Hello Ralph Out of my 500+collection of loc base tubes i have a 7B7 ..name price i will ship .It is used a checks good on tester,, Al Petersburg wv