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

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

B&K 1077B no video - problem solved
#8

I'm going to get back into it tonight. but I disconnected the 2 main resistors off this supply going to different parts of the unit. I'm thinking maybe a diode failed?? It checks ok on my Fluke ... but maybe breaking down when higher voltage is applied?? I have a solid 220 A/C off the PT on that side, yet only around 100v or so with no load. That's with all the caps out of the circuit. BTW, I did change all the electrolytics back with my 1st revamp, so I'll change that diode tonight and clip a fresh e cap on and see that happens. It's actually about the same setup and voltages as the B+ except it's the - supply. I'll try to get a schemo posted which I have with the ICs. It's actually 2 ICs but shown as 4 on the diagram. It's really kinda weird yet ingenious how this works!

If I could find the place called "Somewhere", I could find "Anything" Icon_confused

Tim

Jesus cried out and said, "Whoever believes in me , believes not in me but in him who sent me" John 12:44


Messages In This Thread
B&K 1077B no video - problem solved - by TV MAN - 02-11-2025, 01:26 PM
RE: B&K 1077B no video - by TV MAN - 02-11-2025, 02:03 PM
RE: B&K 1077B no video - by radiorich - 02-11-2025, 09:01 PM
RE: B&K 1077B no video - by TV MAN - 02-11-2025, 09:11 PM
RE: B&K 1077B no video - by radiorich - 02-11-2025, 11:07 PM
RE: B&K 1077B no video - by TV MAN - 02-12-2025, 12:41 AM
RE: B&K 1077B no video - by radiorich - 02-12-2025, 01:55 AM
RE: B&K 1077B no video - by TV MAN - 02-13-2025, 04:04 PM
RE: B&K 1077B no video - by radiorich - 02-13-2025, 10:59 PM
RE: B&K 1077B no video - by TV MAN - 02-15-2025, 12:40 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
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
Philco model 38 code 121 not receiving signal.
Good news everyone! I think I have found everything I need for rewinding the antenna coil primary. I found some pla...Stormlord5500 — 09:40 AM
Philco Battery-WWII vintage
My younger sister went to SUNY Plattsburg NY, (BS, MS, RN) in the late 1970sabout 10 min from the Northern NY / Canada b...MrFixr55 — 07:59 AM

[-]
Who's Online
There are currently 1799 online users. [Complete List]
» 3 Member(s) | 1796 Guest(s)
AvatarAvatarAvatar

>