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Beetle, there are only 3 tubes in the 101 radios, the 12by7a is the driver, and the 2 6js6c tubes are the finals in the PA.
Everything else is solid state.
Yes you need a Service Manual.
You can download a copy here, complements of the Fox Tango Group
http://www.foxtango.org/Manuals/FT-101_SVC_Manual.pdf
You need Adobe to open it, and it is a big download if you are on dial-up.

73
Jeff

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Radio-active

NASA/SOHO


there is no dark side in the moon, really. As a matter of fact it's all dark

Down towards the bottom of the manual is a whole section on trouble shooting,.

Looking at the service Manual,
: PB1183B is the low frequency IF unit.
This has the low frequency IF amp, crystal filter(s), detector and AGC/S meter circuitry.
My first thing to suspect is dry electrolytic caps, these are 40 year old radios, and caps simply do not have a service life that long.
Look for bulging/leaking caps to start.

73
Jeff

__________________
Radio-active

NASA/SOHO


there is no dark side in the moon, really. As a matter of fact it's all dark

Woops! Not paying attention again! Thanks for catching that, Jeff.

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If you're like everybody else,
you're about average.
73 de K7KBN
CWO4 USNR RET.

N/P Beetle, I have sometimers as well
I loved my 101`s when I had them, and made many many contacts with them.
Just like many radios these are suffering from old components, and first on the list for me is caps that dry out.
What was great about the 101`s was that if you had 2 radio`s and one quit board substitution will allow you to quickly swap a board and get it down real fast to were the problem is.
There is a guy on Ebay that used to sell a complete cap set for all of the 101`s to re-cap the whole radio, a very good idea for a radio that is 40+ years old.
Good Luck.

73
Jeff

__________________
Radio-active

NASA/SOHO


there is no dark side in the moon, really. As a matter of fact it's all dark