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

Model 90 Cathedral stopped receiving
#13

Scott, Mike is correct, those capacitors in the cans are (older) replacement electrolytic capacitors and should be replaced at some point if you plan to play the radio very often, but it would be nice if we could get the radio working again before you start replacing a lot of parts.  Below I have labeled some of the parts underneath the chassis and will explain what those components are:
   

Your radio looks like it is an older restoration, but most of the capacitors they used are due for replacement.  I have some of those that are NOS and even unused they measure a high level of leakage.

1:  These are Bakelite blocks that contain paper capacitors, I have only labeled one, but you can see there are many.

2:  These are (older) replacement paper capacitors that that were used to replace the capacitors in the Bakelite blocks.  Instead of putting them inside the blocks they just soldered them on top of the blocks.  I can't tell from the pictures, but the problem with doing that is if you don't disconnect the old blocks that old capacitance will effect the new capacitors.  At any rate, at some point in time, all the capacitors in the blocks and those jumpered on top will need to be replaced.

3.  This is a large wire wound resistor with several taps on it (part# 58 on the schematic).  Yours looks to be in nice shape but an open in one of the sections could kill the radio.

4.  These are resistors, we call them dog bone resistors today.  I didn't label them all but enough so you should be able to ID the rest.  These typically creep higher in value and if 10 or 20% higher than marked should eventually be replaced.

The easiest fix is a bad tube or maybe one that isn't seated well in its socket.  Pulling them out one at a time, cleaning the pins with scotchbrite and reseating is not a bad idea.  Have you tried putting the old #24 back in the radio yet?  If you have access to a tube tester it would be a good idea to test them.

EDIT:  If you need schematics and part lists PM me your email address and I'll send you some hi-res copies.

Edit2:  Rather than regurgitate what has already been covered here are some links you might find helpful:

The first is a restoration of a model 90:

https://mcclellans.com/Philco90Restoration.htm

Another restoration thread by Steve Davis.  Although this is a push-pull 47 chassis you'll find many similarities:

https://philcoradio.com/phorum/showthread.php?tid=20685

From the Philco library this tells you what is inside each of those Bakelite blocks:

https://web.archive.org/web/201702271004...lokcap.htm

And here Mike (morzh) describes the no-mess method of re-stuffing those Bakelite blocks with fresh capacitors:

https://philcoradio.com/library/index.ph...soldering/

John KK4ZLF
Lexington, KY
"illegitimis non carborundum"


Messages In This Thread
RE: Model 90 Cathedral stopped receiving - by Eliot Ness - 08-29-2020, 10:23 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Cannot Adjust an IF Transformer’s cores
It works! I received the PCBs this morning in the mail, and put everything together. I reused the base from the original...jrblasde — 04:32 PM
PT-6 antenna connections
I seem to have lost my way on this PT-6. I see the antenna aerial transformer schematic - I’m reading pins 1 through ...bridkarl — 12:30 PM
40-150 General questions
Good thing you're a good electrician ... the pictures show a lot of rewiring in your future! Take care and BE HEALTHY!...GarySP — 11:52 AM
40-150 General questions
I think RobB has it right. It is a part number and looks like its stamped on the chassis and that wasn't something you ...klondike98 — 11:41 AM
40-150 General questions
It's most likely a part number. Most of Philco part numbers are in that format. I looked at the parts list for this mode...RodB — 08:10 AM
40-150 General questions
Hi Kevin, No, I don't but I like your Quote about being a good electrician. The way I look at it is "The fact ...MrFixr55 — 08:06 AM
Philco 38-7 Speaker
7K should be fine. While not a perfect match (This transformer is meant for 6V6 tubes), Antique Electronic Supply (AES)...MrFixr55 — 08:03 AM
40-150 General questions
I discovered a stamp on the underside of the breadboard on my Philco 40-150. It is"56-1417' in black ink with numbe...Kevin_D — 07:14 AM
Philco 38-7 Speaker
FYI the Impedance of the HR20 (the one I have) secondary of the audio transformer is 5 ohms. The 38-7XX speaker is suppo...tludka — 04:22 PM
Philco 38-7 Speaker
Yeah, don't use the transformer currently on the H-20 (Dopf, I thought "H20, is that new technology, a speaker usin...MrFixr55 — 03:51 PM

[-]
Who's Online
There are currently 2770 online users. [Complete List]
» 2 Member(s) | 2768 Guest(s)
AvatarAvatar

>