Hum Pot adjustments [resolved]

[ArtnShit]

Left for work but will update when I am back!

Thank you !

 

[ArtnShit]

I plugged the left out from BeePre into the right input for Kaiju and music is playing out of the right side. I also checked all of the other inputs and right out will not play from any of them.

Would that mean the problem is stemming from the right out of the BeePre?

 

[Paul Birkeland]

Try the other cable between your BeePre and Kaiju to be certain it isn't that particular interconnect that's causing the problem, otherwise you'll need to delve into the BeePre a bit.

 

[ArtnShit]

I have swapped with other cables and the problem is still persisting. What would be the first step with the BeePre?

On the flip side, I have my Dac+streamer hooked into the Kaiju directly and it sounds FANTASTIC. Thank you for talking me thru this so far.

 

[Paul Birkeland]

I would start with a voltage check.  Is it a BeePre 1 or 2?

 

[ArtnShit]

It's a BeePre2!

 

[Paul Birkeland]

What are the voltages on each 300B socket in your BeePre?

 

[ArtnShit]

I measured the following values w the ground next to the IEC for the black probe.

A1 14.08 vdc
A4 9.21 vdc
B1 8.94 vdc
B4 13.96 vdc

 

[Paul Birkeland]

How about pins 2 and 3 on each socket?

 

[ArtnShit]

Here they are!

A3 .9mVdc
A2 91.9Vdc
B2 93.7Vdc
B3 .6mVdc

No tones playing or anything, just tubes in, powered up. Same ground as the last test.

 

[Paul Birkeland]

OK, well now we get to do the same test to your BeePre that we did with your Kaiju.

You can do the first one with the BeePre off.  Play a 60Hz tone into the inputs, center the balance control, then read the AC voltage at pin 3 on each socket.  (If you have the first upgrade installed you can just play the tone and see what AC voltage appears at pin 3 on each channel)

 

[ArtnShit]

.009V ac B3
.012 V ac A3

 

[Paul Birkeland]

Is that with your test tone all the way up?

 

[ArtnShit]

I guess not! Here is the tone all the way up.

B3 .395vAC
A3 .382vAC

 

[Paul Birkeland]

OK, now turn the preamp on, turn the level controls all the way up, then measure the AC output from each output RCA jack.

 

[ArtnShit]

1.496Vac LO
.491Vac RO

Using the ground for each respective RCA jacket.

 

[Paul Birkeland]

OK, how about the AC voltage for the upper and lower lugs on the volume pot that are closest to the rear of the chassis?

 

[ArtnShit]

Upper 1.502 V ac
lower .381 V ac

 

[Paul Birkeland]

Can I see some photos of the build on the weak channel? The numbers you're posting indicate a weak channel, but not completely dead.

 

[ArtnShit]

I think this is the right channel, right?