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

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Model 90 Stuck At One Volume Level
#15

(04-14-2012, 09:34 PM)Pepperoni Wrote:  Shorted the wiper to chassis...Still have music and I also ran the VC thru it's full range just to see if anything happened. Nothing.

56.0 ohms from that cathode to chassis.

Bought the parts to put a new thermostat and housing gasket on the Ranchero. Decided to do it tomorrow. It was already 2pm. Sat on my butt the rest of the day. I don't usually do that. I'm not a TV person and I always need to be doing something. But I'm taking 5 days off from everything on the 20th and heading north to sit on my butt some more with my best friend. Haven't had a day off since the new year weekend.

Pepper

But you can tune? Or you cannot? If you cannot this pretty much means your Audio stage is your detector, and the RF amp, detectors etc don't do anything.

If you shorted the wiper to GND and it's still there - you can safely assume everything prior to this tube, and including this tube, is not doing much.

Do this: just yank the tube of that detector-amplifier.
Does it still play?
If it does, then yank the 1st AF 27.
And (hard to imagine, but) if it still does...there is nothing more to yank.
If it stops, there is no signal going from your Det. Amp to the 1st AF.

If you yank the det. and it stops playing - keep yanking in the opposite direction (towards the Antenna) until it stops playing.

Let's do that whole exercise first.


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 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
Need to purchase some accessories for restoration of my Old Philco Radio
Here is a list of resources found in our online library that you might find useful. Mike's Gobs of Knobs email addres...klondike98 — 01:46 PM
First Radio restoration
Hi Tubeman, Welcome to the Philco Phorum.  Phamily Phriendly Pfun with Phine Pholks Phull of Philco Phacts. (See a p...MrFixr55 — 12:33 PM
First Radio restoration
You could post in the WANTED ADs section here on the Phorum and see if anyone has an RF generator that they want to sell...klondike98 — 11:55 AM
Zenith H725
Good ideas, thank you Arrange and Rich. I have the adhesive aluminum foil already and can try that immediately. More ...EdHolland — 10:18 AM
Graphics for majestic 1050 dial glass.
Murf; I found this thread on the ARF, the first photo has a pretty good view of the dial glass. Regards ArranArran — 01:12 AM
Zenith H725
hello Ed, how about that speacial tape used for ducting it's like foil or how about thin piece of aluminum roof flash...radiorich — 12:19 AM
Zenith H725
Ed; One material that I have seen, but never tried for this was material for making exhaust gaskets, it's similar to ...Arran — 11:42 PM
Zenith H725
I just remembered, I have some hi temp silicone rubber material which could do the trick. Or a piece of FR4 laminate. Th...EdHolland — 08:39 PM
Zenith H725
The PSU filter cap arrived today (thank you USPS!) so I will work on that later. Meanwhile, I have the dial, speaker...EdHolland — 06:42 PM
Philco 610B oscillator wiring
Thanks Terry. After checking my notes I think I recorded about -10v at the 6A7 G4/control grid. The screen grid (G3 &...Tubester — 05:59 PM

[-]
Who's Online
There are currently no members online.

>