by Ty_Bower » Fri Apr 01, 2011 9:14 am
Is this a proposed build, or an amp you've already constructed? Are we talking two monoblocks, or a single stereo amp?
Each pair of KT120 will require 3.9A of 6.3V heater.
Each Poseidon board will require 0.6A of 6.3V heater (12AX7 and 12AU7).
I'd say as long as you have 5A of heater per channel, you'll be fine.
At idle, I would provide for 210mA of B+ per pair of KT120 (one channel). Expect you will need more current if the amp is driven hard.
With this in mind, either of the transformers you've suggested should work for a monoblock. Neither would provide enough heater current for a stereo amp. You didn't mention rectification, but I'd be cautious running a pair of KT120 with a single 5AR4 as the rectifier. I'd recommend either using two rectifier tubes, or go with solid state rectification.
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