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Do It Yourself (DIY) paradise for tube and SET project builders.

RE: "you generate waste heat, but the tube heaters will not fail prematurely."

It's easy enough to bring the B+ rail voltage down. Replace the 5AR4 with a "potato masher" 5R4. The 1st filter cap. can't exceed 20 μF. So, replace Dyna's crappy choke with something better, like a Hammond 159T, and pile the capacitance up after the choke.

At a 250 mA. B+ draw, the forward drop in a 5R4 is a whopping 67 V. ;>)


Eli D.


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