In article ,
cliff wright wrote:

If a search tells you that they are Darlington devices get
rid of them right off!!!
Darlingtons have a minimum collector/emitter voltage of ~1.5 volts or
more so they will get very hot indeed at 30 amps or so.

Cliff-

Are you sure that applies to Astron-type power supplies? The ones I'm
familiar with do not operate with the pass transistors near saturation.

Perhaps a Darlington device is not the best choice for some other
reason, but I would think a pair of 50 Amp devices could handle 15 Amps
each (30 Amps total) with sufficient cooling, if they are rated for at
least 120 watts each. (I assume 22 volts input, 14 volts output, 8 * 15
= 120 Watts per device.)

Fred
K4DII