1939 model 39-30

Thread Rating:

0 Vote(s) - 0 Average
1
2
3
4
5

Linear Mode

1939 model 39-30

TA Forbes
Deviate Emeritus

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.

Find

« Next Oldest | Next Newest »

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

View a Printable Version

Users browsing this thread: 3 Guest(s)

Recent Posts
Gilfillan Brothers Car Radio?
Hi everyone, Special thanks to Joe Rossi for tracking down this obscure radio and thanks to others who took up the hun...Antipodal — 08:15 PM
trying to identify this wire type
Here's one source for your wire of many. Take care and BE HEALTHY! Gary P.S. Can't get the right color you need? I ...GarySP — 06:40 PM
trying to identify this wire type
...and modern wire of the appropriate gauges and insulation V-rating (300V minimum, usually shown right on the wire) is ...morzh — 05:47 PM
1930s Stromberg-Carlson Tombstone Radio need help identifying model number
I have a question about this radio, is there anyone that has access to this radio that has an intact unmolested speaker ...captainclock1988 — 04:28 PM
1930s Stromberg-Carlson Tombstone Radio need help identifying model number
Well what makes me confuse all of those companies is that all three of those companies (Setchell-Carlson, Stromberg-Carl...captainclock1988 — 04:21 PM
trying to identify this wire type
The red wire is rubber covered wire. The others are cotton braid over rubber often in colors or a tracer, also strand...Chas — 02:43 PM
trying to identify this wire type
Greetings Phorum members, Hope you can help me identify this type of wire in the photo I have attached. I am not sure ...georgetownjohn — 01:53 PM
Philco 60 Squealing
All correct shields must be in place, all tubes correct no subs of any kind. Check any soldered, riveted ground conne...Chas — 01:24 PM
Philco 60 Squealing
I have recapped and replaced out of tolerance resistors and so on. Radio plays nicely on fairly strong stations. The pro...dconant — 10:55 AM
Philco 46-420 Code 121 Reception issues
Welcome Eric, I agree with Bob and far as the two main electrolytic filter capacitors did you change them yourself or w...radiorich — 11:43 PM

Who's Online

There are currently 5853 online users. [Complete List]
» 1 Member(s) | 5852 Guest(s)

Login
Username:
Password:	Lost Password?
	Remember me