Hum Pot adjustments [resolved]

[ArtnShit]

Out of left channel:

.121 V AC center d to RCA Ground

.76VV AC Center RCA to RCA Ground

I am getting 0 when checking C3 to RC Ground, though.

[Paul Birkeland]

You appear to have substantial loss between the RCA jack and the center post of the D jack. What's the AC voltage at the center pot lug?

0V at C3 means the signal isn't making it out of the 5670 stage.  I would expect a DC voltage to be off on the C4S board if signal isn't getting out of here, but admittedly that's not always the case.

[ArtnShit]

Center lug of trim pot and RCA ground = .759 V AC w Tubes in, powered up, and 60hrz tone playing.

Tubes in, powered up, and 60hrz tone playing, using safety ground for all.
IA=298VDC and
OA=443VDC
IB= 297.6 VDC
OB= 181.3VDC
KregA= 3.495VDC
KregB= 6.5VDC

[Paul Birkeland]

Can you post a photo of 4 pin socket and the 0.1uF cap mounted behind it?

[ArtnShit]

Here it is!

Thanks!

[Paul Birkeland]

Ok, on that strip if the 0.51 ohm resistor touches the resistor going to A3, you'll destroy your 300B, so I would slip those 0.51 ohm resistors in toward the 4 pin socket some more.

Where the 0.1uF cap lands on the terminal strip on the 4 pin socket it looks like you need a lot more solder and heat.  Where the white wire jumps from there 5 pins over looks like it could also use a bit more solder.

[ArtnShit]

Made those adjustments!

Reading 23V AC from RCA ground and C3! That's with the tone and tubes in place as well as powered on.

That's the correct measurement, right?

[Paul Birkeland]

Yes, that is a promising change.

[ArtnShit]

Is the next step putting it back in the system?

[ArtnShit]

I still need to figure out why my right channel won't play once everything is hooked together. If this amp can play both channels directly from RCA(computer hookup) to speaker, then would it be reasonable to think it's the pre that needs some adjustments?

[Paul Birkeland]

It's possible that you have something that's loose and flipping the chassis plate around is moving the intermittent connection.

Once you put the Kaiju back in your system, you'd want to play the 60Hz tone back into it directly to ensure that it's still passing signal before looking for problems elsewhere.

[ArtnShit]

Played the 60hrz tone and heard it fine from both speakers! Should I take any more readings or anything before we start looking elsewhere?

[Paul Birkeland]

If you can play the tone through the amp into your speakers, then you need to hook the BeePre up and try with that.

If you only get one channel of output from the BeePre, swap the interconnects at the BeePre to see if the dead channel moves to the other side of the Kaiju.  Be sure to try both cables on both channels to rule out cable problems.

[ArtnShit]

Already tried both cable swapping and hooking into the BeePre again. Swapped all my interconnects for other RCA's I have around 'n such. The right channel is still gone, unfortunately.

[Paul Birkeland]

If you take your BeePre and feed the left output into the right channel of the Kaiju, does that work?