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Old 27th Sep 2018, 4:46 pm   #18
dave cox
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Join Date: Jan 2009
Location: Bristol, UK.
Posts: 1,306
Default Re: 120W PP EL34 amplifier re-born.

You'll need to design the regulator to deliver 6.3V into the 'cold' resistance plus a margin. You won't need to spec the heatsink for that much current though, as before its gets super hot the heater will be hot and the load current will drop. On a shorted heater the LM317 will protect itself (but they are quite cheap anyway).

Current limit is 1.5A Min / 2.2 Typ @ < 15V In to out
This implies cold R is less than 4R2 ?

Does that fit with reality ?

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