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

All ye experienced tube folks, explain me this
#16

I have seen this many times on various old European made radios from the 50's mostly. These radios have their original tubes in them and are still working fine but flash when turned on from a cold start. Think about that for a minute, how many times has this radio been turned on since it was new? Thousands maybe tens of thousands and they still work just fine. I don't think it is anything to be worried about and it does seem to be something in how European tubes are made as I don't ever recall seeing this in an American made tube.

Gregb
#17

That is a weird (to me) way to connect those filaments on that Fisher. It looks like they are using the filaments to bias the output tubes ... wow! I recapped a small signal tracer this week which uses a 12AX7, when I powered up to test, it flashed like you mentioned. It's a Mullard. Still don't think it is anything to be concerned about.

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




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Shadow Meter Bulb
I think after all has been said, I will use the same bulb that is specified for the dial pilot light which is a #55. I ...georgetownjohn — 07:31 PM
12' Philco
There was also this Philco! klondike98 — 07:25 PM
HiFi (Chifi) tube amp build - but my own design.
I expected a challenge and this is just part of it. But, it's also supposed to be fun, entertaining, informative and enj...TV MAN — 07:12 PM
Shadow Meter Bulb
Butting in here with a question. Since the shadow meter is connected directly to the 1st and 2nd I.F.'s wouldn't the met...RossH — 06:43 PM
HiFi (Chifi) tube amp build - but my own design.
Mike, Tim; you are about to enter the twilight zone. Doo doo doo doo, doo doo doo doo This is something alright. I'm go...RodB — 06:26 PM
HiFi (Chifi) tube amp build - but my own design.
:lol: We need to start a singing radio group! I play the guitar, so maybe get a few vocals? Anyways, Mike, I did try mou...TV MAN — 05:56 PM
HiFi (Chifi) tube amp build - but my own design.
And so does a barber shop quartet. mmmmmmRodB — 03:54 PM
Shadow Meter Bulb
I did try an LED bulb in place of the original but wasn't impressed with the amount of light on the dial. Seems like it ...RodB — 03:51 PM
HiFi (Chifi) tube amp build - but my own design.
Tim Would mounting he transformer vertically change the hum, if used without additional parts? Also, in these amps...morzh — 02:25 PM
Shadow Meter Bulb
Gary I doubt it would introduce any noise. We use similar lamps for the panel indication, 12V AC lamps: they are LEDs...morzh — 02:15 PM

[-]
Who's Online
There are currently 5919 online users. [Complete List]
» 1 Member(s) | 5918 Guest(s)
Avatar

>