|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
74.51.153.109
In Reply to: RE: Got one already - Sorry wrong answer posted by airtime on November 18, 2015 at 17:59:40
Hmm. So much for my spiral filament theory. Was the Sherwood rebuilt to stock specs? I think that V5 is for the tone controls. I'm really curious to what it can be.I experienced something kinda of like this that ended up being a bad solder joint but it did it with any tube.
Edits: 11/18/15Follow Ups:
I would like to check Chips theory out. But I really don't want to invest in a NOS/NIB tube just to try it out.
The Sherwood was restored to what I believe was stock or near stock by Mike Samra. So I trust his expertise in this matter.
The ONLY thing I could try is testing the voltages in V,4,5. Because there is NO hum using new tubes in positions V3 and V4. Only with a new tube in V5.
If I test the voltages what pin/pins would be the culprit voltage?
I'm sure that Mike does fantastic work but i'd double check under the socket to be sure something didn't fall through the cracks. Did you try any other new tubes besides the New Sensor made ones? Maybe a JJ or Chinese 12ax7 would do better.
Just the Genelex LPS and the TungSOl.
Oddly enough the Genelex with the spiral filament hums louder/harder (hard to actually describe being isn't a unique hum) than the TungSol.
One more thing to look for, and it's a super long shot, is that the heater wires are tightly twisted going to V5. I hope that you figure this out. I know how frustrating it can be. I have a Citation V with some hum that I can never figure out and I'm too lazy to send it to someone that can.
Does the hum change at all when you move your hand near the tube - or when you install or remove the shield?Does the hum change when you adjust the tone controls?
Do the new tubes hum in any other socket?
Note: edited to add content
Edits: 11/19/15
No change with hands near the tubes.No change with or without the shields or steel case shield.
The new tubes do NOT hum in any other socket. ONLY the V5 socket. The new tubes work very well in sockets V3 and V4.
If the tube is quite it is quiet WITH or WITHOUT the shield.
So for some reason the shielding has nothing to do with it????
Edits: 11/19/15
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: