First amp build

[sluckey]

Grid-41VDC

That's way too much bias voltage. Should be about -15v for EL84s.

[Mongrel714]

Grid-41VDC

That's way too much bias voltage. Should be about -15v for EL84s.

How do I go about fixing that?, Ive noticed Ive left off some ground wires, Im fixing that, then I will re check.
Thanks for the comment !!

[Adrien]

Is that +41 or -41V? Looks like your bias diode is backwards. Fix that and double check before you put the tubes in again! The bias voltage should be negative relative to ground. 

[Mongrel714]

Is that +41 or -41V? Looks like your bias diode is backwards. Fix that and double check before you put the tubes in again! The bias voltage should be negative relative to ground.

Ah ok, thank you, will do!

[Mongrel714]

The bias resistors are backwards!

[Mongrel714]

Well didnt help much, heres what were running now,
B+ These measurements are off the can caps,
1-405VDC-405
2-369VDC-369
3-335VDC-335
4-331VDC-328
EL84, off the pins,
Plate-403VDC-405
Grid-41VDC-25
Screen-369VDC-370
I'm running 100k resistors on pin 2 The grid, what really bothers me is there is 404VDC going to the Stand by switch, rated for 250VAC, I'm kinda baffled here, do I add some more dropping resistors? Thanks for any help!

[sluckey]

Looks like your bias diode is backwards.

Let me repeat, this time a little louder... YOUR BIAS DIODE IS BACKWARDS!!!!!

[Mongrel714]

Looks like your bias diode is backwards.

Let me repeat, this time a little louder... YOUR BIAS DIODE IS BACKWARDS!!!!!

Sorry, I'm usually not this air headed, I did turn around the two resistors instead of the Diode, I mis read.

[Mongrel714]

Ok, now on pin 2 the volts go up to around 7 then back to zero and stay there, Ive got the meter set on 20vdc.

[sluckey]

Ok, now on pin 2 the volts go up to around 7 then back to zero and stay there, Ive got the meter set on 20vdc.

That's still not good. I suspect you may have damaged the two 10µF bias caps when the diode was backwards. Replace them.

Take both EL84s out of the amp and don't put them back in until you can measure approx -15V (that's negative 15 volts) on pin 2 of both EL84 sockets.

[Mongrel714]

Ok, did some research while I was at work today, I had the Bias voltage coming from the tube rectifier, which is wrong, un hooked that, soldered it to the HT lead out of the power transformer and boom, uh no, not boom, it worked,  I have -41 volts! Turning the Bias pot went up to -61volts, Is that high? It was supposed to have a 50k trim pot on the board, I have a 25k Trim pot, so I wired up a 50 k pot instead, have to find out if that is wired correctly or not, You can see it in the pics, the wiper and right term wired together then to the 68k resistor, the right terminal to the 10uf cap and ground, let me know what you think ! Thanks a ton everyone!

[sluckey]

I've told you twice how much voltage you should have.

[Mongrel714]

I've told you twice how much voltage you should have.

Very sorry I asked again.