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In Reply to: RE: Am i using this 6X5GT rectifier correctly? posted by Tre' on March 25, 2016 at 17:28:56
Do I need to lift it?
Follow Ups:
50VAC may not be enough voltage to get emissions. This is an indirectly heated rectifier, right? Try cranking the primary voltage up a bit more.
I actually had it up past 60vac. By then the tube was hot and still not much conduction. The voltage went up to 2vdc or something around there.
I assumed the 50vac is at the primary of a power transformer.
I also assumed that the power transformer is a step up transformer so there should be (again, I'm assuming) more than 50vac across the plates (half of whatever that number is on each plate).
But, you could very well be right!
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
The primary is 117vac. The secondary is 450vct.
I noticed in a normal setup, the GZ34 doesn't start conducting until about 80VAC is applied by the Variac.
My Mullard gz34 all start conduction before 60vac. By that voltage the heaters have started conducting and the DCV has already started to rise.
OK.But was the heater winding on the same Variac driven power transformer?
I made another assumption that DAK's heaters were at full voltage and only the HT was limited.
I seem to be just full of assumptions. :-)
but back to your point, yes....if the heater is not hot enough the rectifier tube will not conduct. (and that might not have anything to do with the AC on the rectifier tube's plates)
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 03/25/16
No.
The CT not grounded is the only thing I can think of as a possible problem.
If there is AC on the plates and the heater is heated then there should be B+ on the cathode.
That's a head scratcher.
Is/was your meter set to DC when you checked the voltage at the cathode?
I'm grasping at straws, I don't know what else to do.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
It is a real head scratcher. I will try to disconnect it and see what happens. The tube heats up so the filaments are connected. And like I mentioned I only have the rectifier connected so nothing after it can be a problem. cheers, Dak
Yes, could be.
Your DC meter might not read pulsating DC.
A cap would make that non-pulsating DC.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
.
.
Have Fun and Enjoy the Music
"Still Working the Problem"
Nope, no difference or very little. I will try more tests tomorrow. good evening. Dak
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