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

37-620 Mystery Part - Value?
#1

http://www.nostalgiaair.org/PagesByModel...013212.pdf

I have a question about part 34, listed as a 400 ohm bakelite resistor. It is in the cathode of the IF amplifier. What is installed (and appears original - in fact ALL parts of the radio are original) is a flexible resistor with code RED, BLACK, BROWN (body, end, dot). If this were a normal resistor it would be 200 ohms. But I don't know if the codes for flexible resistors are the same. It measures 810 ohms - likely too high. The value is stable (does not change when the resistor is moved).

So what should I replace it with? Leave it (value is correct), or 400 ohms per schematic, or 200 ohms(?) as installed?

As an aside, the cathode bypass capacitor, part 35, is listed as .05 in the schematic AND the parts list. But a 0.25mfd capacitor (a Philco part, 30-4446S) is installed, and looks all original - no signs of any servicing being done. So perhaps there have been some changes made to this radio?

Any advice would be appreciated.


Messages In This Thread
37-620 Mystery Part - Value? - by davemc - 01-23-2011, 05:37 PM
Re: 37-620 Mystery Part - Value? - by Ron Ramirez - 01-23-2011, 10:01 PM
Re: 37-620 Mystery Part - Value? - by davemc - 01-24-2011, 02:36 PM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
Philco Battery-WWII vintage
Hello Bob, What Amazing find! Sincerely Richardradiorich — 10:19 PM
Testing a speaker and output transformer Trutone A2-G
Hi Murf, Do this: Monitor between ground and one plate of the rectifier while playing the radio.  Do the same with ...MrFixr55 — 09:51 PM
Philco Battery-WWII vintage
Mike; I take it that Soviet cars did not come equipped with block heaters, hence the hot oil change? Where I lived in...Arran — 08:42 PM
Philco 42-345 Restoration/Repair
The more the better. (Within reasonable limits.) 2-5 times more is no problem in this case.Vlad95 — 03:50 PM
Philco 42-345 Restoration/Repair
Thanks, RodB and Vlad95, I was mainly trying to figure out this capacitor to locate a replacement, Vlad thank you for...osanders0311 — 03:44 PM
Testing a speaker and output transformer Trutone A2-G
Would an output transformer if weak, cause the problems I am seeing with lower B+ voltage? murfmurf — 01:22 PM
Testing a speaker and output transformer Trutone A2-G
Hello murf! I merged the threads. Please do not start new threads regarding the same radio. Take care, - GaryGarySP — 10:21 PM
Philco 42-345 Restoration/Repair
Regarding picture 5 on page 1 of this thread this capacitor is #40 on scematics diagram - 4mF+4mF. Black wire is "-...Vlad95 — 09:01 PM
Philco 42-345 Restoration/Repair
That's a dual 4 MFD, red and green are both 4mfd and black is common negative. You should be able to see them in the pow...RodB — 08:58 PM
Philco 42-345 Restoration/Repair
Can anyone help me figure out a capacitor that has 3 wires coming out of it red and green on one side and a black wire o...osanders0311 — 08:14 PM

[-]
Who's Online
There are currently 286 online users. [Complete List]
» 1 Member(s) | 285 Guest(s)
Avatar

>