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: 5,084
Threads: 270
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: 7,286
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: 15,811
Threads: 553
Joined: Oct 2011
City: Jackson, 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: 7,286
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: 15,811
Threads: 553
Joined: Oct 2011
City: Jackson, 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: 7,286
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: 5,084
Threads: 270
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: 5 Guest(s)
|
|
Recent Posts
|
|
HiFi (Chifi) tube amp build - but my own design.
|
| Tim,
nice write up and thanks for sharing !!
Sincerely Richardradiorich — 02:47 AM |
|
HiFi (Chifi) tube amp build - but my own design.
|
| Well, this was a real "Hum-Dinger" :lol: ! This will be kinda long, but hopefully it will help others having t...TV MAN — 01:55 AM |
|
Shadow Meter Bulb
|
| Phorum members, I am trying to find the bulb # for PHILCO Shadow Meter part number 45-2180 that is from a 37-640 chassis...georgetownjohn — 06:53 PM |
|
Philco 41-608 changer coupler
|
| 3D-printing...short of machining, of course.
Or molding.morzh — 05:20 PM |
|
Philco 41-608 changer coupler
|
| Thanks, Morzh.
That solves the issue of the rubber pieces. Now, I need to find a way to replicate the pot metal piec...alangard — 05:07 PM |
|
12' Philco
|
| If it is 12', either Kareem or Andre would have to jump pretty high to look at the front panel.
Kareem would have an e...morzh — 01:48 PM |
|
12' Philco
|
| And here's a story about the tires on the truck. Same "no-stoop" guy must have installed these! Take care a...GarySP — 01:17 PM |
|
Hickok AC51 tube tester
|
| I think they have only shown the secondaries of the transformer.
Two of them feed the rectifiers' filaments.morzh — 12:58 PM |
|
IF can wire size and Rubber mounts?
|
| Arran
If the wire inside cans is the gauges you mentioned, the sole reason for that would be mechanical, to stiffen t...morzh — 12:56 PM |
|
12' Philco
|
| Rod,
Yes, I know, but the Giant Philco is not around anymore either, so I go by whoever was alive fairly recently.
H...morzh — 12:54 PM |
|
Who's Online
|
There are currently 6979 online users. [Complete List]
» 2 Member(s) | 6977 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
