This is a rack mount guitar tube stereo power amplifier. I
made it for a friend, who had it built in an amp head but wanted it to
be rack-mounted. I basically took out the transformers and the circuit
boards and repositioned them in the new chassis, which was fabricated
by hifi2000. I also corrected many design errors in the original amplifier, mainly related to noise and protections.
It is a stereo power amplifier, but can also work directly connected to
the guitar. It has a classic 6L6GC tetrode push pull arrangement,
capable of about 45Wrms.
All the PCBs were originally done for the guitar head (so not made by me), except the one to support the 6L6GCs.
This is not the tidiest amplifier I made: to mantain the original PCBs
but with different placement, many wires were needed. Also, with better
transformer design, the whole amplifier could have been built on a 3U
enclosure: but for 5mm the power transformer imposed a 4U rack.
Thermal design was a particular concern, due to the limited air flow in
a rack enclosure (only the front and the rear of a rack-mounted
apparatus are exposed to the external air flow!). The design is similar
to many professional power amplifier, in which fresh air enters from
the front panel and is extracted with a fan on the rear panel. I choose
an industrial, ball-bearing fan (not a computer one).
Feel free to write me to ask any questions.
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