Zenith 12H090

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

Linear Mode

Zenith 12H090

Arran
Phorum Expert

Posts: 4,804
Threads: 54
Joined: Sep 2008
City: Sandwick, BC, CA

#27

12-10-2018, 05:34 AM

Another thing that some manufacturers did, although this would show on the parts list but not the circuit diagram, was to use 1/4 Watt resistors, which probably explains why I run into so many that have drifted upward in resistance over time in certain makes. In many tube circuits 1/4 Watt is just borderline, use at least a 1/2 Watt for replacement.
Regards
Arran

Find

« Next Oldest | Next Newest »

Thread Closed

Messages In This Thread

Zenith 12H090 - by EdHolland - 05-27-2018, 03:11 AM

RE: Zenith 12H090 - by morzh - 05-27-2018, 11:30 AM

RE: Zenith 12H090 - by EdHolland - 05-27-2018, 07:54 PM

RE: Zenith 12H090 - by morzh - 05-27-2018, 11:14 PM

RE: Zenith 12H090 - by EdHolland - 05-29-2018, 01:51 PM

RE: Zenith 12H090 - by Electrothaumaturgist - 05-30-2018, 02:26 PM

RE: Zenith 12H090 - by morzh - 05-30-2018, 04:51 PM

RE: Zenith 12H090 - by Electrothaumaturgist - 05-30-2018, 06:26 PM

RE: Zenith 12H090 - by Arran - 05-31-2018, 04:42 AM

RE: Zenith 12H090 - by EdHolland - 05-31-2018, 04:08 PM

RE: Zenith 12H090 - by Electrothaumaturgist - 06-01-2018, 01:41 AM

RE: Zenith 12H090 - by Arran - 06-01-2018, 02:15 AM

RE: Zenith 12H090 - by Electrothaumaturgist - 06-01-2018, 03:39 AM

RE: Zenith 12H090 - by morzh - 06-01-2018, 07:55 AM

RE: Zenith 12H090 - by EdHolland - 06-01-2018, 12:43 PM

RE: Zenith 12H090 - by Electrothaumaturgist - 06-01-2018, 03:31 PM

RE: Zenith 12H090 - by Arran - 06-02-2018, 03:06 AM

RE: Zenith 12H090 - by Electrothaumaturgist - 06-02-2018, 05:48 AM

RE: Zenith 12H090 - by EdHolland - 10-25-2018, 11:51 PM

RE: Zenith 12H090 - by Arran - 10-27-2018, 04:09 PM

RE: Zenith 12H090 - by jcassity - 10-28-2018, 07:57 PM

RE: Zenith 12H090 - by EdHolland - 12-02-2018, 12:44 PM

RE: Zenith 12H090 - by EdHolland - 12-03-2018, 03:03 AM

RE: Zenith 12H090 - by EdHolland - 12-05-2018, 03:00 PM

RE: Zenith 12H090 - by EdHolland - 12-09-2018, 09:58 PM

RE: Zenith 12H090 - by Ron Ramirez - 12-09-2018, 11:17 PM

RE: Zenith 12H090 - by Arran - 12-10-2018, 05:34 AM

RE: Zenith 12H090 - by morzh - 12-10-2018, 09:20 AM

RE: Zenith 12H090 - by EdHolland - 12-11-2018, 02:05 PM

RE: Zenith 12H090 - by EdHolland - 12-16-2018, 11:45 PM

RE: Zenith 12H090 - by EdHolland - 01-13-2019, 09:37 PM

RE: Zenith 12H090 - by EdHolland - 01-20-2019, 11:20 PM

RE: Zenith 12H090 - by EdHolland - 01-27-2019, 10:35 PM

RE: Zenith 12H090 - by EdHolland - 02-01-2019, 05:06 PM

RE: Zenith 12H090 - by EdHolland - 02-02-2019, 10:26 PM

RE: Zenith 12H090 - by jcassity - 02-03-2019, 01:47 PM

RE: Zenith 12H090 - by EdHolland - 02-03-2019, 05:56 PM

RE: Zenith 12H090 - by EdHolland - 02-03-2019, 07:34 PM

RE: Zenith 12H090 - by jcassity - 02-04-2019, 11:55 AM

RE: Zenith 12H090 - by EdHolland - 02-04-2019, 03:29 PM

RE: Zenith 12H090 - by EdHolland - 02-08-2019, 02:37 PM

RE: Zenith 12H090 - by EdHolland - 02-09-2019, 11:17 PM

RE: Zenith 12H090 - by morzh - 02-10-2019, 11:19 AM

RE: Zenith 12H090 - by EdHolland - 02-11-2019, 04:04 PM

RE: Zenith 12H090 - by EdHolland - 02-12-2019, 01:27 PM

RE: Zenith 12H090 - by EdHolland - 02-18-2019, 02:36 PM

RE: Zenith 12H090 - by EdHolland - 02-23-2019, 03:17 AM

RE: Zenith 12H090 - by OldRestorer - 02-23-2019, 08:14 AM

RE: Zenith 12H090 - by EdHolland - 02-23-2019, 07:17 PM

RE: Zenith 12H090 - by EdHolland - 02-23-2019, 07:34 PM

RE: Zenith 12H090 - by EdHolland - 02-23-2019, 09:10 PM

RE: Zenith 12H090 - by OldRestorer - 02-24-2019, 03:02 PM

RE: Zenith 12H090 - by EdHolland - 02-25-2019, 06:34 PM

RE: Zenith 12H090 - by jcassity - 02-25-2019, 07:31 PM

RE: Zenith 12H090 - by tbone - 02-25-2019, 08:31 PM

RE: Zenith 12H090 - by Arran - 02-26-2019, 06:55 AM

RE: Zenith 12H090 - by EdHolland - 02-26-2019, 09:15 PM

RE: Zenith 12H090 - by OldRestorer - 03-19-2019, 01:01 PM

RE: Zenith 12H090 - by EdHolland - 03-19-2019, 09:36 PM

RE: Zenith 12H090 - by EdHolland - 05-26-2019, 12:46 AM

RE: Zenith 12H090 - by morzh - 05-26-2019, 08:32 AM

RE: Zenith 12H090 - by EdHolland - 05-26-2019, 10:48 AM

RE: Zenith 12H090 - by Eliot Ness - 05-26-2019, 11:11 AM

RE: Zenith 12H090 - by EdHolland - 05-26-2019, 09:22 PM

RE: Zenith 12H090 - by morzh - 05-27-2019, 10:43 AM

RE: Zenith 12H090 - by EdHolland - 05-27-2019, 11:48 AM

RE: Zenith 12H090 - by EdHolland - 01-12-2021, 08:45 PM

RE: Zenith 12H090 - by Arran - 01-13-2021, 12:31 AM

RE: Zenith 12H090 - by EdHolland - 01-13-2021, 11:33 AM

RE: Zenith 12H090 - by EdHolland - 01-16-2021, 09:58 PM

RE: Zenith 12H090 - by EdHolland - 01-21-2021, 08:25 PM

View a Printable Version

Users browsing this thread: 2 Guest(s)

Recent Posts
B&K 1077B no video
Hello Tim, I would if it's a leaky Capacitor So are all 3 of those B- voltages low then ? Sincerely Richardradiorich — 01:55 AM
B&K 1077B no video
I found a schematic and think I have the problem traced down to the minus power supply. I have very low voltages that go...TV MAN — 12:41 AM
RCA 15X
I'd try replacing the bulb first and if that doesn't do it, then change the 35Z5 and see if the problem goes away.NostalgiaRadioTime — 12:28 AM
B&K 1077B no video
Hello Tim, I have that exact unit in my shop too plus a Sencore unit there are times I like one or other !!. Sincerely...radiorich — 11:07 PM
RCA 15X
Everthing goes at once, maybe it's the cold weather, I have had 2 dial strings break and no my little RCA is having dial...Paul Philco322 — 10:26 PM
Philco 91 Schematic
Hi Dan, I can't explain this specific resistor but I have seen the use of a switch to apply B+ voltage to screen gri...RodB — 09:36 PM
6TPZ and 5TPO Radio Help
I suspect it's been repaired before. And I suspect whoever repaired it, wanted to re-use old transistors' pin stubs in o...morzh — 09:24 PM
B&K 1077B no video
Thanks Rich! I'll take a look and see what he has. I know there's more modern equipment to be had, but this one I know a...TV MAN — 09:11 PM
B&K 1077B no video
Hello Tim, Here is a link to restoration of one on Phil's old radios site ! Sincerely Richard bk1077bradiorich — 09:01 PM
6TPZ and 5TPO Radio Help
I'm a little befuddled on this one. Should X5 and X4 be tied together like this? It looks like someone added this at so...R3Sons — 07:33 PM

Who's Online
There are currently no members online.

Login
Username:
Password:	Lost Password?
	Remember me