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

Zenith Model 7 -S-204 "Waltons"
#3

Hi Chas ,
Thank you for your helpful reply . I am much closer now to figuring out which coil tags are connected to what. And , yes, the ohmmeter readings do provide clues.

I presume that ,when on broadcast , all the windings on the secondary of coil #2 are in circuit seeing as broadcast is the lowest frequency band the radio tunes to. Thanks for the pointers there.
Another mystery has revealed itself in the meantime. One of the leads to Cap 21 which links the tops of the primary and secondary windings of coil#1 and which sits in the top of coil#1, has corroded away so that part of the circuit was open circuit.

Looking to replace this cap I found when I checked the schematic (a slightly blurry Radiomuseum one ) I found it listed ( in a separate box on the schematic above the R16 listing) as 10 mfd ceramic. Certainly it is ceramic but the capacity at 10 mfd seems very high, especially for such a physically small capacitor. Could the 10mfd be a misprint? If 10mfd is correct why is it ceramic? What should I replace it with? Thanks for your help with this set. And thanks to the Phorum for facilitating this kind of assistance. I'd be lost without it.


Messages In This Thread
Zenith Model 7 -S-204 "Waltons" - by Antipodal - 08-30-2023, 05:11 PM
RE: Zenith Model 7 -S-204 "Waltons" - by Chas - 08-30-2023, 06:53 PM
RE: Zenith Model 7 -S-204 "Waltons" - by Antipodal - 09-01-2023, 10:29 PM
RE: Zenith Model 7 -S-204 "Waltons" - by Chas - 09-02-2023, 01:06 AM
RE: Zenith Model 7 -S-204 "Waltons" - by RodB - 09-02-2023, 09:04 AM
RE: Zenith Model 7 -S-204 "Waltons" - by RodB - 09-17-2023, 09:45 AM
RE: Zenith Model 7 -S-204 "Waltons" - by Chas - 09-17-2023, 10:18 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 42-345 Restoration/Repair
Vlad95, Thank you for the stringing guides and wow there are so manyosanders0311 — 06:01 PM
5U4 vs 5Z4 tubes
A pre war Hallicrafters, and an early one too, very nice! 1936 is pretty early for metal tubes too, which would explain ...Arran — 05:58 PM
Philco 42-345 Restoration/Repair
Thanks Rod, "When you hear the background hiss and no station it usually indicates that the oscillator quit" ...osanders0311 — 05:52 PM
Philco 42-345 Restoration/Repair
RodB :beerchug:Vlad95 — 10:22 AM
Philco 42-345 Restoration/Repair
Vlad, you nailed it. Swiss and German roots.RodB — 09:54 AM
5U4 vs 5Z4 tubes
Well this is a Hallicrafters SX/9 circa 1936. No real issues so far although I dodged a real bullet with a cap that was...bridkarl — 07:59 AM
5U4 vs 5Z4 tubes
The pinout is the same but the 5U4 has a 3 amp filament, verses 2 amps or less on the 5Z4. I think that the pinout of a ...Arran — 12:04 AM
Philco 42-345 Restoration/Repair
By the way. osanders0311 Take a look here: Dial cord stringing Guides May be here you can fount correct string settin...Vlad95 — 11:15 PM
5U4 vs 5Z4 tubes
5U4 and 5Z4 almost identical. I think nothing happened if you left 5U4 instedad 5Z4 long time. Just heater current 5U4 ...Vlad95 — 11:02 PM
Philco 42-345 Restoration/Repair
Hello Vlad95 , Very Funny ! Sincerely Richardradiorich — 11:01 PM

[-]
Who's Online
There are currently 1345 online users. [Complete List]
» 1 Member(s) | 1344 Guest(s)
Avatar

>