Posts: 1,385
Threads: 45
Joined: Nov 2017
City: Menlo Park
State, Province, Country: CA
I think the problem is traced - to noise on the AC line. It sounded so local, that it seemed certain it was generated within the set. The thing is so sensitive, that any interference is hard to hear on another radio, but I have convinced myself this is actually the case. Coincidence of "pops" with flickering of the neon in my power strip was eventually demonstrated using another receiver - with and without the Zenith plugged in and running. A good thing too, as I was runnning out of ideas excepting possible heater to cathode shorts in one of the valves.
Last thing today was breaking down and replacing the wiring for the pilot lamp. This was insulated with some plastic or rubber that had become very sticky and unpleasant. Access to the connections on the chassis was difficult, as was opening the bulb-holder, but I wanted to replace the wires throughout.
I'm declaring this one done! (with some follow up pics when it is back in the cabinet.)
I don't hold with furniture that talks.
Messages In This Thread
RE: Zenith H725 - by EdHolland - 04-08-2025, 05:51 PM
Users browsing this thread: 1 Guest(s)
|
|
Recent Posts
|
|
Philco 42-345 Restoration/Repair
|
| Yes, 57 is an electrolytic cap that should be 12 mfd 400 volts according to the parts list from the Phorum library schem...RodB — 06:01 PM |
|
Philco 42-345 Restoration/Repair
|
| Looks like if I am reading it correctly it looks like the silver capacitor#57 that appears to be a replacement is of a l...osanders0311 — 05:09 PM |
|
Philco model 38 code 121 not receiving signal.
|
| Thanks Arran. Yeah this plastic is pretty thin. It's a little thinner than the original stuff. It kinda reminds me of p...Stormlord5500 — 04:37 PM |
|
Testing a speaker and output transformer Trutone A2-G
|
| The equivalent of one short turn is basically the same as that of a shorted load.
If it is the primary's turn, then the ...morzh — 03:53 PM |
|
Testing a speaker and output transformer Trutone A2-G
|
| I've never had an output transformer become shorted, the failure mode is usually an open primary, or in a center tapped ...Arran — 03:52 PM |
|
Philco model 38 code 121 not receiving signal.
|
| As long as the plastic sheeting isn't too thick, I think that the thickness of photographic film would be just about rig...Arran — 03:19 PM |
|
Philco model 38 code 121 not receiving signal.
|
| Well why not! :lol:Stormlord5500 — 03:14 PM |
|
Philco model 38 code 121 not receiving signal.
|
| Good luck next thing you know you will be winding coils just for the fun of it. DavidDavid — 11:29 AM |
|
Testing a speaker and output transformer Trutone A2-G
|
| morzh
Short-circuited turns can be considered as a half-dead transformer.
But on this case transformer will hot and s...Vlad95 — 11:01 AM |
|
Testing a speaker and output transformer Trutone A2-G
|
| I am not sure how a transformer could be weak. It could be inadequate, but only when you replace the original with somet...morzh — 09:56 AM |
|
Who's Online
|
There are currently 2217 online users. [Complete List]
» 2 Member(s) | 2215 Guest(s)
|
|
|
|
 
|
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
