I am somewhat mystified by the messages. The Alpha 76A has 2 or 3 tubes
3CX400. But there is a difference. The 3 tube version you can plug one socket
and then use 2 3CX800A7 tubes. They fit fine. I changed one and mounted the
transformer inside the unit. It works fine.
There is a problem with the two tube version. If you change to tubes to 2
3CX800 tubes - the sockets are too close together so they do not fit. That
would require more work because the holes and all the chimenys are too close
together. I have a 2 hole amp and used the 3CX400 tubes. I run that amp at
1200 watts and it has run flawlessly for years.
I did a couple of other things to my amp. I installed a vertical array inside
between two meters for grid response. Because these LEDs are much quicker that
the meter it is much faster and that lets me monitor forward output with the
meter. Then, I converted the output meter to read peak reading with a meter
used for the Bird Wattmeter. I have about 6 amplifiers and with those two
changes this amp is the one I use day after day.
73, Colin K7FM
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