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Model 90 Stuck At One Volume Level
Pepperoni
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Posts: 160
Threads: 42
Joined: Apr 2011
City: New Port Richey State, Province, Country: Florida
#8

04-13-2012, 10:25 AM
I've seen the other talk about a similar problem. The google world. My CT/Wiper of the VC goes directly to the grid of the Det. Amp. #27. The ungrounded leg goes directly to 18 & 19 which are new parts and verified good.

I took two new 11X17 schematics and started highlighting each section of the radio as it pertains to each circuit. So Far all connections and components around the Det. Rect., VC and Det. Amp are good. Something is looping around and putting an audio signal directly to the grid of the 1st AF without going thru the Det. Amp.

I ground the grid of the Det. Amp. and I still have the same volume and that says that some signal is getting to the 1st AF via something else besides the Det. Amp.

I'm proceeding with my troubleshooting while paying close to the other forums to see what they come up with. I know that Terry D. guy and he's pretty sharp. I'm gonna follow some of his steps too to see what I come up with.

Headlines at 11!

Pepper
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Messages In This Thread
Model 90 Stuck At One Volume Level - by Pepperoni - 04-12-2012, 04:54 PM
RE: Model 90 Stuck At One Volume Level - by morzh - 04-12-2012, 10:19 PM
RE: Model 90 Stuck At One Volume Level - by Pepperoni - 04-13-2012, 10:25 AM
RE: Model 90 Stuck At One Volume Level - by morzh - 04-14-2012, 03:44 PM
RE: Model 90 Stuck At One Volume Level - by morzh - 04-14-2012, 03:52 PM
RE: Model 90 Stuck At One Volume Level - by morzh - 04-14-2012, 07:16 PM
RE: Model 90 Stuck At One Volume Level - by morzh - 04-14-2012, 09:51 PM
RE: Model 90 Stuck At One Volume Level - by morzh - 04-15-2012, 01:04 PM
RE: Model 90 Stuck At One Volume Level - by morzh - 04-15-2012, 02:26 PM



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