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

Model 90 Stuck At One Volume Level
#16

Hi morzh,
Yes I can tune the radio and all stations are where they're supposed to be. Only one station (1260 AM) I'm right on top of the transmitter and it always comes in loud and clear. The others are out of Portland 35 miles away and over a small mountain range still come in but with this volume stuck in neutral they're faint.

I pulled the Det. Amp. and it stops playing.

Your last entry confused me a bit. "If you yank the det. and it "STOPS" playing... I'm sure you meant that if I yanked the Det. Amp. and it "KEPT" playing to proceed yanking? It stopped playing with the Det. Amp. out so I saw no need to proceed yanking tubes. Hope I was right.

Last night I found "NO CONNECTION" to one side of the 1st IF Compensating Condenser #11. The side that goes from the condenser to the 1st IF. Top cap wire was in place from the IF to the tube. So I made that connection but it made no difference in my current symptoms. Because of that I'm taking a fresh 11X17 schematic and going thru the whole radio again highlighting every circuit making sure it's right. I've done this 3 times. How did I miss it.Icon_redface

And I go by Pepper here because Johnny was already taken when I signed up. Call me what you will... Just not late for dinner.

Thanks morzh,
Pepper

"It's Nice To Be Nice To The Nice"
Major Frank Burns Mash 4077th
#17

Pepper,

Whatr I meant was: If it stops playing after yanking, then PUT IT BACK first, then keep yanking to the left (towards the Antenna.)
I missed "put it back first". Without putting it back there will be no need yanking anything else, of course.

What I wanted to see if there is a tube to the left of teh Detamp that you can yank, and it would still play.


So, now: 1) Put DetAmp back (we know it stops playing when you pull it), and 2) yank the previous tube (det. Rectifier)

Does it still play?.


PS. This proverb in Russian sounds "You may call me a pot, just don't put me in the oven" Icon_smile
#18

Oh morzh, I kind of figured that's what you meant. Why keep yanking without putting the first one back in. Wouldn't tell us anything. So I went off and proceeded as I thought you meant and guess what. You got me going in the right direction. I was headed east instead of west. Everyone, including myself was concentrating on the audio circuit. Nothing wrong in the audio circuit it was towards the front end.

The wire I found missing from #11 1st IF compensator? I found it. It was at the correct pin on the 1st IF transformer but the other end was connected to #39 compensating condenser with the 51K and 700pfd cap on it in the oscillator circuit. Made the correction and the darn thing sings like a bird.

I can only say thank you very much! Your help is very appreciated. Guess we can put this one to bed.

Thanks,
Pepper

"It's Nice To Be Nice To The Nice"
Major Frank Burns Mash 4077th
#19

Praised be the Lord. Icon_e_biggrin
#20

(04-15-2012, 01:26 PM)morzh Wrote:  Praised be the Lord. Icon_e_biggrin

AMEN!
Johnny


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




Users browsing this thread: 3 Guest(s)
[-]
Recent Posts
Jackson 715 not working
Now that you posted the schematic, I don't know why that Sprague electrolytic cap is across the meter, as it is not indi...MrFixr55 — 05:51 PM
HiFi (Chifi) tube amp build - but my own design.
What may be lacking in the PP Tube amps may be the 2nd harmonics, which some, especially RCA back in the day called &quo...MrFixr55 — 05:32 PM
Jackson 715 not working
Usually in an emission tester, the tube under test is measured as if it were a diode. So, some testers connect all the g...RodB — 04:17 PM
Restoring Philco 37-604C
Yep. F5 is green, D5 is Red. Red is Bad. Green is Clean.morzh — 01:30 PM
Jackson 715 not working
I did start to do that but I stalled out because I could not figure out how the grid and plate get voltage. In this diag...daveone23 — 11:52 AM
Restoring Philco 37-604C
(Insert Homer Simpson "DOPF" Here.) When all fails, look at the can. Took the Ron Ramirez advice, red Caig D...MrFixr55 — 09:23 AM
Philco 91 Speaker Replacement
From your text I am not sure if you intend to use the existing speaker with a resistor instead of the field coil. It wo...morzh — 08:44 AM
Philco 91 Speaker Replacement
My field coil is bad. I am still hoping to find an original, but if I can't I will go with a fitting Philco speaker, 125...dconant — 08:34 AM
Philco 91 Speaker Replacement
As Rod said, it is OK to use a fitting speaker, and then look for an original one. If you buy a Hammond 125 output tr...morzh — 08:15 AM
Philco 91 Speaker Replacement
Yes, I often have to substitute, then keep an eye out for an original. In the meantime, the radio is working and being e...RodB — 08:02 AM

[-]
Who's Online
There are currently 5378 online users. [Complete List]
» 1 Member(s) | 5377 Guest(s)
Avatar

>