Ok, I am at the point here where I'm checking my tube socket voltages.
The heater voltages look fine across the board, but the voltage chart tells me I should have 200V on pin 6 of V1 but I'm reading up around the 400V range on pin 6 for V1,2,3 so what might be causing that? I've triple checked my wiring and everything looks good. I must have miss something
Tube socket votages
-
- Senior Member
- Posts: 729
- Joined: Sat Oct 23, 2004 3:51 pm
- Location: Virginia
- 5150loveeddie
- Senior Member
- Posts: 3340
- Joined: Mon Apr 12, 2004 8:52 pm
- Just the numbers in order: 13492
- Location: Montreal, Quebec CANADA
Hold everything up and let George or Jon reply to you.......this is not normal!
Glutathione increase specialist
http://www.max.com/science/448523/full/ ... lutathione" onclick="window.open(this.href);return false;
http://www.max.com/science/448523/full/ ... lutathione" onclick="window.open(this.href);return false;
- Flames1950
- Senior Member
- Posts: 9294
- Joined: Sun Feb 08, 2004 1:04 am
- Location: Waukee, Iowa
-
- Senior Member
- Posts: 729
- Joined: Sat Oct 23, 2004 3:51 pm
- Location: Virginia
That's with the tubes out.
I'm reading ~ 490V on pin 6 of V4-7 which I would assume could be normal without the tubes in place but this 400v+ on the preamp sockets seems way too high to me. I could be wrong though. I have never done anything this exstensive on this amp before.
I am really missing my amp I hope I can get this problem resolved.
I'm reading ~ 490V on pin 6 of V4-7 which I would assume could be normal without the tubes in place but this 400v+ on the preamp sockets seems way too high to me. I could be wrong though. I have never done anything this exstensive on this amp before.
I am really missing my amp I hope I can get this problem resolved.
- Flames1950
- Senior Member
- Posts: 9294
- Joined: Sun Feb 08, 2004 1:04 am
- Location: Waukee, Iowa
Try measuring the voltages with the tubes in. This is exactly what I was getting on my amps with the tubes out, preamp plate voltages looked way too high, but since there's no tubes drawing current you're not dropping any voltage anywhere in the circuit (at least that's the only explanation I could reason out.) After I put the tubes back in so that current was being drawn through the circuits and the voltage was dropping on the 10K resistors and tube plates I could read the normal voltages as expected.
That's the same conclusion that I'm coming to because everything else seems to check out fine.
The only thing that keeps me from putting the tubes in and checking the votlages is that I am only reading about 20V higher than what the charts states on the power tube sockets for the plate readings which would support the "no-draw" position and I don't want to turn my preamp sockets into launch pads for the tubes
The only thing that keeps me from putting the tubes in and checking the votlages is that I am only reading about 20V higher than what the charts states on the power tube sockets for the plate readings which would support the "no-draw" position and I don't want to turn my preamp sockets into launch pads for the tubes
-
- Senior Member
- Posts: 729
- Joined: Sat Oct 23, 2004 3:51 pm
- Location: Virginia