Posts: 3,135
Threads: 54
Joined: Apr 2011
City: Lexington, KY
(04-22-2019, 01:36 PM)morzh Wrote: ........... I think my drop power resistor (the one mounted proud on top the chassis, riveted to it) has the leakage which develops when it is powered up. I desoldered the wire going to the tube and left the wire going to the filter, and replaced it with 82 Ohm 5W resistor. The hum got greatly reduced. (I cannot unsolder it altogether as it houses the second and third resistive sections of 970 Ohms). So I think I will replace the whole thing and see if it gets completely cured.........
Are you referring to the candohm resistor? I have read in this model they can develop a resistance to the chassis that causes a hum.
John KK4ZLF
Lexington, KY
"illegitimis non carborundum"
Messages In This Thread
RE: Another 7G605 Zenith TO - by Eliot Ness - 04-22-2019, 02:34 PM
Users browsing this thread: 36 Guest(s)
|
Recent Posts
|
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 |
Shadow Meter Bulb
|
Not sure if anyone has tried this but there are 6.3 volt miniature lamps in bayonet and screw-in base options available ...GarySP — 11:31 AM |
Shadow Meter Bulb
|
Any 6.3 volt pilot light will work. I would use the brightest one I could find in my workroom. Be sure the dial is clean...RodB — 10:45 AM |
HiFi (Chifi) tube amp build - but my own design.
|
Tim,
nice write up and thanks for sharing !!
Sincerely Richardradiorich — 02:47 AM |
HiFi (Chifi) tube amp build - but my own design.
|
Well, this was a real "Hum-Dinger" :lol: ! This will be kinda long, but hopefully it will help others having t...TV MAN — 01:55 AM |
Who's Online
|
There are currently 6838 online users. [Complete List] » 2 Member(s) | 6836 Guest(s)
|
|
|
|