116B Frequency drift - Printable Version

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+--- Thread: 116B Frequency drift (/showthread.php?tid=13183)

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116B Frequency drift - Hank G - 09-24-2015

My 116B drifts about 100kz from start-up until good stablity about one half hour later, most noticeable on the 4.1 to 10kz band. Would this drift be considered normal. Thanks.
Hank

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RE: 116B Frequency drift - morzh - 09-24-2015

What is 4.1 to 10kz band, never heard of such.

No, drift of such magnitude is abnormal. Look at the heterodyne oscillator.
Has the radio been recapped?

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RE: 116B Frequency drift - Ron Ramirez - 09-25-2015

He meant to say 4.1 to 10 MHz, or mc if you prefer. Band 4 on the 116 scale.

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RE: 116B Frequency drift - Radioroslyn - 09-25-2015

Just a few things to check. The plate voltage on the 76 tube to see if it is constant if not check the 10k resistor and the 1mf cap. Replace 76 tube. Clean band switch contacts and 76 socket.

Terry

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RE: 116B Frequency drift - Hank G - 09-25-2015

(09-25-2015, 06:03 PM)Radioroslyn Wrote:  Just a few things to check. The plate voltage on the 76 tube to see if it is constant if not check the 10k resistor and the 1mf cap. Replace 76 tube. Clean band switch contacts and 76 socket.

Terry

Thank you for the ideas, I believe I have another 76 tube to try.  I did replace all the caps and resistors, except for a few micas.  I found the micamold micas to be leaky, the Cornell Dubliers checked ok, may recheck those.

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