Hi all.
I've begun to put together what I intend to be a cheap little amp to sound nice (more pleasing than absolutely accurate). So I already had the cheap red pcb TPA3116 board and it's pretty impressive for what it is IMHO.
Now I've bought and assembled one of Pete Millet's Nutube buffer boards to use as a front end. Problem is one side biases up fine the other sits around 20ishV, also the VFD teal blue section is much brighter for one side than the other. Any suggestions on where to start trouble shooting?
The boards are running off a shared 24v power supply, nothing in the amp looks wrong, the faulty channel measures slightly higher voltage here and there, and I see no reason for this, could I have a faulty nutube? Any ideas other than spin in rough draft in the PCB and see if the fault stays with the board or follows the tube chip?
Thanks.
I've begun to put together what I intend to be a cheap little amp to sound nice (more pleasing than absolutely accurate). So I already had the cheap red pcb TPA3116 board and it's pretty impressive for what it is IMHO.
Now I've bought and assembled one of Pete Millet's Nutube buffer boards to use as a front end. Problem is one side biases up fine the other sits around 20ishV, also the VFD teal blue section is much brighter for one side than the other. Any suggestions on where to start trouble shooting?
The boards are running off a shared 24v power supply, nothing in the amp looks wrong, the faulty channel measures slightly higher voltage here and there, and I see no reason for this, could I have a faulty nutube? Any ideas other than spin in rough draft in the PCB and see if the fault stays with the board or follows the tube chip?
Thanks.
Twas a faulty potentiometer causing the issues
I had a faulty trimmer causing a fault on a brand new amp. The voltage was jumping all over the place. Replaced it and everything was fine.
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