BeePre Voltage Check Fail [resolved]

[galyons]

My BeePre has performed marvelously for years now,  But today it just did not sound right.  So I did a voltage check. Everything was within spec, except for one C4S board. All the LED's are glowing on the C4S board.  There are no visibly burned resistors.  But I am getting off voltages on the board:
T16 3.2VDC v. 5VDC 
T17 116.6VDC v. 90-110VDC
T19 10.16VDC v. 9.86VDC

So it looks like I have lost the magic smoke somewhere.  The Smash is filling in, but...

Thoughts to resolve?

Cheers,
Geary

 

[Paul Birkeland]

The 3.2V is an oddball, what is POS OUT on that side of the preamp?  I suspect that is your 10.16V, and that in combination with the low 3.2V is the root of the problem.  Does this set of voltages happen to follow a tube?  The high voltage at T19 tends to suggest that the 300B on that side is not drawing a lot in the way of current, and this is confirmed by the low bias voltage at T16.  If these voltages are not dependent on a particular 300B, there's likely a loose solder joint at work preventing the filament from drawing appropriate current.

 

[galyons]

  :-[  The good news is it is NOT a bad solder joint!  The bad news is that it is, in fact, the 300B. I should have thought to swap sides! I was just shocked, as the BeePre has been pretty faultless!  Known pair of 300B's in and making beautiful music!! 

Thanks PB for the rapid and correct diagnosis!! 

Cheers,
Geary