Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x


Philco 84 continuation
#1

Hello Everyone,

I am once again back on trying to restore my Philco 84. I had stoped working on it for a few different reasons which hurt me because some of the knowledge I picked up on theory
went down the drain. Here's what I did am where I am at:

I replaced all the resistors except a wire wound 325 ohm which still measured at that value.
I replaced the bakelite capacitors and replaced the 8k & 4k electrolytic capacitors with singe 10k/10k electrolytic capacitor .
I added a S7 speaker from a Philco 60 because mine was to far gone to try and repair (I tried).

When I powered it up I just got noise out of the speaker with nothing really appearing different as I changed frequencies. I read that filter capacitors
sometimes cause this problem but electrolytics seem good and I made sure that the rivet on the 42 tube had a good ground which was completed by a 
previous owner.
I made continuity measurements on the coils and they seem in range. I know I should replace the 16k resistor with a higher wattage one.

Are there any suggestions on what I should do next on troubleshooting? I do have an oscilloscope and a older signal generator. What areas do you
think I should test. All the vacuum tubes are lit and tested fine on my tube tester. I have attached some pictures and the schematic.

Regards,
Bob


Attached Files Image(s)
           


Messages In This Thread
Philco 84 continuation - by Ctkid - 03-02-2026, 07:00 PM
RE: Philco 84 continuation - by radiorich - 03-02-2026, 08:28 PM
RE: Philco 84 continuation - by Ctkid - 03-02-2026, 08:46 PM
RE: Philco 84 continuation - by radiorich - 03-03-2026, 01:41 AM
RE: Philco 84 continuation - by dconant - 03-03-2026, 12:50 PM
RE: Philco 84 continuation - by Ctkid - 03-03-2026, 01:40 PM
RE: Philco 84 continuation - by Ctkid - 03-03-2026, 01:44 PM
RE: Philco 84 continuation - by dconant - 03-03-2026, 05:35 PM
RE: Philco 84 continuation - by klondike98 - 03-14-2026, 02:31 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 71 Code 125
Technically, that's C-. B- is chassis ground. The resistor between chassis ground and the HV center tap makes the HV c...MrFixr55 — 11:24 PM
54C Cabinet Refinish
hello Roy, I’d follow Arran’s suggestion and use automotive gasket material, which I keep around for situations like th...radiorich — 10:22 PM
Philco 71 Code 125
This might be one of those cases where it's a ground to an AC voltage and B- to DC.RodB — 08:22 PM
Philco 71 Code 125
Really Rod? I know you would not steer me wrong but AI say this is a short circuit? What if I moved the 6 volt center ta...dconant — 06:40 PM
54C Cabinet Refinish
Roy; Personally I would have left the asbestos alone if it were my set, but you can find a modern substitute that som...Arran — 04:51 PM
Philco 71 Code 125
Looks like that might be the B- buss, so that would be correct.RodB — 01:32 PM
Philco 71 Code 125
I noticed on the code 121 schematic the center tap for the 6 volt winding and hv winding are tied together. Is this corr...dconant — 12:16 PM
Philco 45-6365 Universal IFT Instruction Manual
The Philco Parts Catalog for 1942 shows it as usable for 175 kHz, 260 kHz, and 465 kHz. The instructions will show how t...DaleHCook — 11:19 AM
Stromberg Carlson 1500 Squeal
Hello Rob, I agree with you—I have one here at my house that I need to check out. It’s way over-engineered just to make...radiorich — 11:05 AM
My Atwater Kent 84
Well getting around to restoring my AK84. Mike was a big part in me being able to snatch this one a few years ago. I won...462ron — 10:57 AM

[-]
Who's Online
There are currently no members online.

>