Model 57 compensator values?
Posts: 15
Threads: 3
Joined: Apr 2015
City: Seattle, WA
Can anyone tell me the values of the four compensating capacitors (trimmers) on the model 57?
I took mine apart and carefully marked them but according to the schematic they were wired wrong. I want to put the radio together right so I am not sure where they go. Caps are 12, 15, 18, 19. Thanks.
Bob Atchison
Happiness is a warm glowing radio!
Posts: 5,170
Threads: 274
Joined: Nov 2012
City: Wilsonville
State, Province, Country: OR
Hi Bob, Welcome to the Phorum. Here's a schematic link for folks who might be able to help with answers.
Posts: 7,301
Threads: 269
Joined: Dec 2009
City: Roslyn Pa
Unfortunately the diagram and parts list don't divulge the actual values of the trimmers. You maybe able to find out via the part #s. Or if you have a capacitance meter you could measure them and take an educated guess as to where they go ( the lower the fq the higher the capacitance)
Definitely will need to use a generator to align the IF trimmers, they will make a big difference if they are off.
Terry
(This post was last modified: 04-08-2015, 07:26 AM by Radioroslyn.)
Posts: 16,507
Threads: 572
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Why do you need values?
I think those mounted on tuning cap, osc and ant, are the same, and the two in the back are likely shown correct. One of them, the 19, is the feedback regenerative circuit cap.
My guess as to the value of the ones on the tuning cap is maybe 20-30pF. But as long as you have them, the value is of no concern.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 7,301
Threads: 269
Joined: Dec 2009
City: Roslyn Pa
Well there two on the tuning condenser,one in the lo circuit, two across IF trans, the regen control. So there is six all together. Best I remember some of them are isolated from the chassis. It may turnout that they are close enough in value that it doesn't matter which one goes where.
Terry
Posts: 16,507
Threads: 572
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Obviously regen cap should go where it was before as otherwise you won't have the regen control easily accessible as intended, from the back of the chassis.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 7,301
Threads: 269
Joined: Dec 2009
City: Roslyn Pa
The regen control has the fiber nut on it the other are brass.
Terry
Posts: 15
Threads: 3
Joined: Apr 2015
City: Seattle, WA
OK That's one. There are still three that I can't figure out, and they are not the same value because there are a different number of plates. I do have a cap meter, but I need to know which one goes where. thanks all!
Happiness is a warm glowing radio!
Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand
State, Province, Country: Indiana
Take a look at the back side of each trimmer. The Bakelite insulator should have one letter stamped multiple times all over it. Match that letter to the parts list.
One should be stamped with the letter A, one with D, and one with S. The regeneration control, part (19), probably will not have a letter on it.
A - part (12), IF primary, part no. 04000-A
D - part (18 ), IF secondary, part no. 04000-D
S - part (15), low frequency padder, part no. 04000-S
--
Ron Ramirez
Ferdinand IN
Posts: 15
Threads: 3
Joined: Apr 2015
City: Seattle, WA
You'da man, Ron. Thanks!
Happiness is a warm glowing radio!
Posts: 15
Threads: 3
Joined: Apr 2015
City: Seattle, WA
I checked all the trimmers, they are correct. I still have this horrible oscillation at full volume, low frequency, not a hum, more like a screech. It breaks into it just about the time you get a station tuned in either on the main tuner or on one of the trimmers. Any ideas???
Happiness is a warm glowing radio!
Posts: 5,170
Threads: 274
Joined: Nov 2012
City: Wilsonville
State, Province, Country: OR
Too high (clockwise rotation) on the regen trimmer will cause screaching, does backing it off (counter clockwise rotation) help?
Posts: 13,776
Threads: 580
Joined: Sep 2005
City: Ferdinand
State, Province, Country: Indiana
This radio should have a tube shield over one or both of the 77 tubes - I do not remember as I do not own one, but it is one or both of the 77 tubes. In any event...is (are) the shield(s) in place?
--
Ron Ramirez
Ferdinand IN
Posts: 15
Threads: 3
Joined: Apr 2015
City: Seattle, WA
Nothing I do will stop it till I power it off then back on. I can back out the regen trimmer but then I lose everything
Happiness is a warm glowing radio!
Posts: 15
Threads: 3
Joined: Apr 2015
City: Seattle, WA
That makes sense but only one has a shield and only it has the ring at the bottom for it. my radio looks like the one here:
http://www.radiomuseum.org/r/philco_57.html
Happiness is a warm glowing radio!
Users browsing this thread:
|
|
Recent Posts
|
|
Philco 42-345 Restoration/Repair
|
| Yes, 57 is an electrolytic cap that should be 12 mfd 400 volts according to the parts list from the Phorum library schem...RodB — 06:01 PM |
|
Philco 42-345 Restoration/Repair
|
| Looks like if I am reading it correctly it looks like the silver capacitor#57 that appears to be a replacement is of a l...osanders0311 — 05:09 PM |
|
Philco model 38 code 121 not receiving signal.
|
| Thanks Arran. Yeah this plastic is pretty thin. It's a little thinner than the original stuff. It kinda reminds me of p...Stormlord5500 — 04:37 PM |
|
Testing a speaker and output transformer Trutone A2-G
|
| The equivalent of one short turn is basically the same as that of a shorted load.
If it is the primary's turn, then the ...morzh — 03:53 PM |
|
Testing a speaker and output transformer Trutone A2-G
|
| I've never had an output transformer become shorted, the failure mode is usually an open primary, or in a center tapped ...Arran — 03:52 PM |
|
Philco model 38 code 121 not receiving signal.
|
| As long as the plastic sheeting isn't too thick, I think that the thickness of photographic film would be just about rig...Arran — 03:19 PM |
|
Philco model 38 code 121 not receiving signal.
|
| Well why not! :lol:Stormlord5500 — 03:14 PM |
|
Philco model 38 code 121 not receiving signal.
|
| Good luck next thing you know you will be winding coils just for the fun of it. DavidDavid — 11:29 AM |
|
Testing a speaker and output transformer Trutone A2-G
|
| morzh
Short-circuited turns can be considered as a half-dead transformer.
But on this case transformer will hot and s...Vlad95 — 11:01 AM |
|
Testing a speaker and output transformer Trutone A2-G
|
| I am not sure how a transformer could be weak. It could be inadequate, but only when you replace the original with somet...morzh — 09:56 AM |
|
Who's Online
|
| There are currently no members online. |
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
