jezz
100+ Head-Fier
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"Son of Zen" is a different amp than Zen (article here). Pass calls it "balanced single-ended."
"Son of Zen" is a different amp than Zen (article here). Pass calls it "balanced single-ended."
sr-007 and sr-009 are j66k at 20khz
srm727-2 is 8.5 ma per output driver, and is 3db down at 100khz with a standard 120pf load
all the other solid state amps are similar. Remember that there is up to 20db of feedback to
keep the frequency response flat.
the tube designs are 50k plate resistors, and 3db down at about 50khz. Also 20db of feedback.
The T2 is 20ma of bias per output tube and is 3db down at about 230khz.
(lots of other tricks going on here)
Surprisingly, this is a cheap inverter from HK and its a 50khz fast switching circuit. If you take a look at this circuit, 50hz switcher will need a huge transformer. The efficiency of this circuit maybe around 80-90%. The to220 transistor does not get hot at all.
...The T2 is 20ma of bias per output tube and is 3db down at about 230khz.
(lots of other tricks going on here)
"Stax SRM-T2, fry some eggs while you listen"...
I've been working on possible ultra simple Stax amps for a few months now but but I'm so frustrated by the disappearance of high voltage transistors that I'm going with all tubes for this one. That has problems as well but I'm fairly sure ECC83's will remain in production for decades to come.
That is possible but one has to thing about the filament-cathode voltage limit in that regard. Gain is not really the problem with these amps though as most are run without feedback. Add feedback and it becomes an issue.