"Mark Zarella" wrote in message
...

Doesn't matter much though. Those butler amps are barely tube amps. If
I'm
not mistaken, they still have solid-state preamps and are too clean to be
distinguished from their SS counterparts. But don't quote me on that.

no you're correct they only have tubes are in the final stage to prevent
microphonics. I think there is a write up in CSR but it's a SS with tube
buffers.