[HomeBrew] Voltage tripler and ICAS v.CCS question

[n6kyr@netzero.net]

Hello to all!  Hopefully someone can verify
my design questions.

I am looking to power a tube amplifier that uses a pair of 812A
tubes (it's a James Millen Co 90881). The power supply requirements for this will be 1040 VDC at 235
mA. The problem is looking for a suitable plate transformer to
satisfy this particular rating. However, I think I found a
configuration that might suffice: I stepped across a transformer sold
by RF Parts. The company states that the unit will supply 600
VDC at .5 amps at 120 VAC input or 1200 VDC at .4 amps (ICAS) with
240 VDC input. Both outputs are using voltage doublers. I suspect
using the output of the transformer sans doubler with 120 VAC in is
300 VAC or so volts at 1 ampere.

I think that if I was using a voltage tripler for the circuit (with
the primary set to 120 VAC), I could realize 900 VDC at .33 amps
(which is close to my 1040 VDC/230 mA requirements).

Does this sound reasonable? Looking for any comments on this proposed
circuit. Also, I see that their spec says 1200 VDC at .4 amp in ICAS condition. I want to run AM operation (which I suspect is CCS condition). This transformer otta handle that, right? Thanks.


Cal, N6KYR



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