1939 model 39-30

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1939 model 39-30

TA Forbes
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Posts: 2,353
Threads: 92
Joined: May 2010
City: Clayton, NC

09-20-2013, 01:14 PM

Bill/Tom: great advice. Funny thing about 75 tubes, the mutual conductance of the triode is only 750 uMhos, and it doesn't take long for it to degrade to the 500 range. In sets where the 75 is the only AF amp before the output tube this can be an issue.

Also: 42 tubes can be noisy after they warm up. Same goes for 6F6 tubes.

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Messages In This Thread

1939 model 39-30 - by NostalgiaRadioTime - 09-14-2013, 12:47 AM

RE: 1939 model 39-30 - by Radioroslyn - 09-14-2013, 06:54 AM

RE: 1939 model 39-30 - by Bill Kinghorn - 09-14-2013, 10:42 AM

RE: 1939 model 39-30 - by Jamie - 09-14-2013, 02:40 PM

RE: 1939 model 39-30 - by Tom Hamilton - 09-20-2013, 11:29 AM

RE: 1939 model 39-30 - by TA Forbes - 09-20-2013, 01:14 PM

RE: 1939 model 39-30 - by TA Forbes - 09-20-2013, 01:15 PM

RE: 1939 model 39-30 - by NostalgiaRadioTime - 09-20-2013, 01:45 PM

RE: 1939 model 39-30 - by wa2ise - 09-20-2013, 04:30 PM

RE: 1939 model 39-30 - by wireless - 09-21-2013, 05:45 PM

RE: 1939 model 39-30 - by NostalgiaRadioTime - 09-21-2013, 09:45 PM

RE: 1939 model 39-30 - by NostalgiaRadioTime - 09-21-2013, 09:49 PM

RE: 1939 model 39-30 - by Electrothaumaturgist - 09-21-2013, 10:57 PM

RE: 1939 model 39-30 - by Arran - 09-21-2013, 11:00 PM

RE: 1939 model 39-30 - by Eric Adams - 09-22-2013, 11:23 AM

RE: 1939 model 39-30 - by PhilcoJohn - 09-26-2013, 08:01 AM

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