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: 5,129
Threads: 271
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: 7,294
Threads: 268
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: 16,273
Threads: 566
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: 7,294
Threads: 268
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: 16,273
Threads: 566
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: 7,294
Threads: 268
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: 5,129
Threads: 271
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: 6 Guest(s)
|
|
Recent Posts
|
|
An attempt to remove the Field Coil from a G speaker
|
| Gary
I in fact did, on a 38-14, I think, where I had a speaker with the dead coil.
Well...it kinda worked. Kinda, be...morzh — 10:38 PM |
|
An attempt to remove the Field Coil from a G speaker
|
| Mike, what ever happened to that plan you had to try using a rare earth magnet to magnetize the pole? This looks like a...GarySP — 10:25 PM |
|
RCA T62 is playing.....
|
| Beautiful set.morzh — 09:07 PM |
|
An attempt to remove the Field Coil from a G speaker
|
| Well....here it is.
The green stuff. Unfortunately, probably penetrates deep.
I opened the top layer and saw that:
...morzh — 08:58 PM |
|
Philco 91 Restore Code ??
|
| :clap: :clap: :clap: :clap:
Really nice workmanship!!! Top of the chassis looks great.
Sorry about the long winded e...MrFixr55 — 08:09 PM |
|
Philco 40-120C Restoration
|
| Thank you for your reply. I will check voltages on the other tubes, look at resistor 23 and cap 25, etc. If all else fai...bluecap — 07:58 PM |
|
RCA T62 is playing.....
|
| Nice looking set great save. DavidDavid — 07:48 PM |
|
Philco 89 indicator light.
|
| Hello Jim, I have done several 89s. The trick is to move the drum in or out on it's shaft. You will need to loosen a set...dconant — 07:36 PM |
|
An attempt to remove the Field Coil from a G speaker
|
| MrFixr
Yes, it is my plan to go with 45rpm spider if I go that far.
No, the pole was not left-handed as I unscrewed ...morzh — 07:14 PM |
|
Philco 40-120C Restoration
|
| Change the tube. Check the tube's bias network.
Are any other tubes experience the drop or just this?`
Is resistor 23 OK...morzh — 07:09 PM |
|
Who's Online
|
| There are currently no members online. |
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
