Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

Model 90 Stuck At One Volume Level
#8

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

"It's Nice To Be Nice To The Nice"
Major Frank Burns Mash 4077th


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



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
HiFi (Chifi) tube amp build - but my own design.
It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM
Philco 71 Code 125
Hello,  I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated.dconant — 07:57 AM
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM
54C Cabinet Refinish
I started stripping this cabinet before it got super chilly out because I knew I wasn't going to be able to work on ...glyphmon — 11:18 PM

[-]
Who's Online
There are currently 1588 online users. [Complete List]
» 1 Member(s) | 1587 Guest(s)
Avatar

>