Firestone 4A22

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Firestone 4A22

Eric
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Posts: 451
Threads: 85
Joined: Nov 2011
City: Cumming, GA

08-12-2015, 06:32 PM

Firestone 4A22
I had this around for a while and thought I would give it a try so I recapped and checked the tubes all went well and I hooked it up to the variac and brought it up. It played good for about 2 days (not continuous) when I heard some crackling form the speaker and lost the station so I shut it down. Went back over my work and all was OK started voltage checks which ran about 20% higher than posted values and ran into a problem on the Plate of the 6K6 output tube would start to build then drop to about 2v  . From there I started checking the output transformer and the primary is open. I dug into the leads to check the soldering and connection and it looked good.

  I have an output transformer a PT-291 8 watt, should I use the full primary 491 ohms?

http://www.nostalgiaair.org/pagesbymodel...006233.pdf

Unfortunately the print here is not complete I have vol 15 so it was not a problem for me.

Thanks Eric

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Messages In This Thread

Firestone 4A22 - by Eric - 08-12-2015, 06:32 PM

RE: Firestone 4A22 - by Radioroslyn - 08-12-2015, 08:39 PM

RE: Firestone 4A22 - by Eric - 08-13-2015, 09:50 AM

RE: Firestone 4A22 - by Radioroslyn - 08-13-2015, 06:30 PM

RE: Firestone 4A22 - by Eric - 08-13-2015, 07:51 PM

RE: Firestone 4A22 - by Radioroslyn - 08-13-2015, 08:03 PM

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