SET Asylum

Posted by David McGown (A) on November 14, 2010 at 04:15:35

In Reply to: RE: Full Monkey amps posted by Frihed89 on November 14, 2010 at 03:38:57

I believe the reason has more to do with power supply than circuit, in my estimation. Using the higher power DHTs means designing power supplies 650VDC or above, which is above the rating most of the commercially available capacitors, outside of motor runs. Also outside the voltage rating of commonly available hook-up wire. You can use of series pairs of lower voltage caps (450V) with voltage dividing resistors in the power supply. Also, drive voltage increases with the higher power low-mu tubes, so it is increasingly difficult to use a single tube driver. (300B is OK with high transconductance triode or triode connected pentodes with a Mu around 45+). Forget about 845s, except at low voltage (211s would work with high voltage supply).