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In Reply to: RE: Corrected Schematic.... posted by Jim Dowdy on January 18, 2015 at 05:37:36
for your suggestion. I can only tell you, I tried putting a grid resistor to ground on V2 ...it didn't work on my amp.
I can only show what has worked for me and I think the circuit shown
represents what I have now that is working.
Again Thank you for your input !
Willie
Follow Ups:
Willie--- what was the value of the grid resistor-to-ground that you tried on V2?
--Dennis--
with that I got no sound !
It sounds decent without a Grid resistor !
Willie
Hi Willie.
Try 350K, then try 250K. Let me know what happens.
---Dennis---
"Dennis I tried a 50K ......with that I got no sound !"That's a clue. I still don't know what it means but *no sound when a 50k grid resistor is in place* is a clue.
Do you have 2 channels behaving this way?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 01/18/15
What value resistor would be worse than no resistor?
There's no such thing as too low, at least in terms of the function of the tube itself.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
What voltage is the grid of the 26 sitting at? What didn't work with the resistor?
"I tried putting a grid resistor to ground on V2 ...it didn't work on my amp."
So the amp runs and sounds good with no bias reference for the second type 26 tube?
That's really interesting.
I wonder what's going on there.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Yeah Tre'
It seemed strange after others had suggested I needed a grid resistor.
But thatsit.
Willie
Maybe this addresses what some may view as a compromised PSU design?
If the grid is not bias referenced (ie; some connection back to the cathode. Normally done with a resistor or grid choke to ground so the cathode resistor can provide bias for the tube or in the case of a direct coupled circuit the reference is back through the previous stage), the tube cannot work properly if at all.Does anyone have any insight as to what's going on here?
The amplifier is reported as working and "sounds decent".
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 01/18/15
1) Bad V2 with internal resistance between cathode filament and grid?2) Enough dirt or other substance on tube socket to act as a grid reference?
3) DC Leakage through coupling cap?
Edits: 01/18/15
otherwise I wouldn't think it would work at all.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
I'm still pondering how V2 functions as drawn.
Who knew?
a learner how that could be the case?
Thanks in advance.
91.
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