Posts: 18,428
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Mike,
This one looks like it actually "burned" burned, not just heated over long time.
Steve,
It is interesting phenomenon. Yes, dogbones, 95% I encounter or so, they increase in value over time, from 20-50% to all the way 100-150%.
But.
There is that place in some sch, where those are used as the immediate bucking resistors/dividers right after the power supply, and they conduct some significant current. Those are often 1W or 2W larger and large dogbones.
Like these in my RCA140: (R5/6/7) at the top of this picture
Or in Philco 60 (and some other Philcos) R19, 22 and 24.
I have always found these dropping in value, unlike the rest of the resistors within the same radio.
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: 18,428
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Other than one cap, which will go to outside potentikometer, which I have not put itn for that reasin (will solder it after the board is ready to be re-installed), this is how it looks now:
Top
Bottom
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: 3,190
Threads: 226
Joined: May 2008
City: Omak
State, Province, Country: WA
Hello Morzh,
That resistor board looks good !
Sincerely Richard
Posts: 18,428
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Now is the time to start clearing and cleaning that mess that I showed before. Then the electrolytic cap restuffing and mulling over what to do about that cap can. Restuff / clip and bypass.
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: 3,190
Threads: 226
Joined: May 2008
City: Omak
State, Province, Country: WA
Hello morzh, I have a General Motors console that I never finished working on, but I should. Its chassis had a big can like that too, about 3 inches square on my set, and I need to replace the voltage divider resistor.
Big wirewound one with open sections I already stuffed the sardin cans with new capacitors .
Sincerely Richard
Posts: 18,428
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Big can by itself is not a problem; For instance, the Philco ones are mostly easy to handle. They have that panel where the cans are soldered to and that easily separates from the rest of the can which is bolted to the chassis. The hardest part is to remove the tar block. But the removal is easy.
With the RCA the very removal is the problem. Thick gauge metal can, being held by tabs of the same gauge that have to be unbent.
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: 3,190
Threads: 226
Joined: May 2008
City: Omak
State, Province, Country: WA
Hello Morzh,
Yes, I have seen how that unit is mounted to the chassis .
Sincerely Richard
Posts: 18,428
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Extracted the main elecxtrolytic cap. Ity is 16uF (10uF in the sch).
Now, this is the picture of the space under the tuning coils.
There are caps to be replaced.
The access looks like so:
This is the top
And the other side, also with caps underneath (no, not that BB). You could see it right above it.
Gonna be challenging.
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: 3,190
Threads: 226
Joined: May 2008
City: Omak
State, Province, Country: WA
Hello morzh ,
Yes it will be a challege but I know your up to it .
Sincerely Richard
Posts: 18,428
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
I ain't up to it but do I have a choice?
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: 711
Threads: 46
Joined: Sep 2009
City: Lapeer, MI
State, Province, Country: USA
BAD wire, bad! Richard is correct, YOU can do this! Joe
Courage will follow when Faith takes the lead.
Posts: 18,428
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Well, today was somewhat busy, so, hopefully, tomorrow.
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: 3,190
Threads: 226
Joined: May 2008
City: Omak
State, Province, Country: WA
Hello morzh,
Same here I have stuff to get done sunday too I just need to get some spunk in my repair .
Sincerely Richard
Posts: 18,428
Threads: 622
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Today I decided it was time to remove that RF assy.
After unscrewing the posts and snipping wires, it was still being held in place, and I almost gave up, but then I calmed down and found things that were holding it (wires to the tubes' panels). Actually not that many. There it is. The assy and what is under it.
Many wires are rubber-insulated, so will have to be replaced. They used a medley of wires, some with rubber insulation and some cloth-covered.
Other than that, I had to remove the interstage transformer and realized one half of the secondary is open (strange, usually it is the primary).
Also I tested the tubes, and 2A7, the pentagrid, the first I tested it, somehow did not even move the needle; then I took it out, checked the filament, gave it the look, and put it back. I worked, but it was SOOO weak, I do not think it is usable. Will have to buy a new one. Actually, might borrow one from the other two radios.
The rest of the tubes all test strong to very strong.
Also I desoldered/clipped everything going to the tuner cap. It is very dirty and needs to be washed.
So far this is it.
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: 1,519
Threads: 69
Joined: Nov 2012
City: Kansas city, MO.
 Following your restoration.
Users browsing this thread: 2 Guest(s)
|
|
Recent Posts
|
|
Philco 71 Code 125
|
| Ok guys. Thanks for the input. As for AI this is why I ask the experts.
Dandconant — 07:39 AM |
|
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 |
|
Who's Online
|
There are currently 2422 online users. [Complete List]
» 2 Member(s) | 2420 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
