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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: they won't listen ... posted by rage on January 24, 2022 at 18:56:38:
Gotta understand, Dude! One has to think it through
first:It's a Direct-Coupled amp because that's the best sound
that money can buy. That means some considerations:
(A) Main B+ power supply must supply
higher voltage in order to get proper cathode
and grid voltages on the output tube, and to
deliver proper operating voltages for the driver stage.(B) The higher the main B+ is, the more output tube
plate current you can run because your driver plate
can run higher, and this is also the output tube grid.
Higher grid voltage here means more output tube plate current.The best sounding bypass capacitors-- which include
the excellent Dynamicaps, have voltage ratings of
somewhere near 410 volts D.C. Would you like those running
at-- say-- 500-to-550 volts? No? How about a higher voltage
bypass capacitor that sounds like !#@$@$# compared to
Dynamicaps or Mundorf Silver-Oils? Afraid not.......How about rectifiers? 5U4GB's even with choke-input much
prefer Power supply voltages that are under 475 VDC. Want
a higher-voltage rectifier than the 5U4GB? Hint: in order
to sound GREAT, Directly-Heated is far superior. Solid-State?
OK-- step-down a notch on music quality. Not for me.I could go on and on, but one can see that a Direct-Coupled
2-stage amp will TELL YOU what the output tube plate current
WILL BE.It is, however, no problem whatsoever. In fact, the resulting
sound quality is quite superior.This doesn't mean that I run plate currents that are too low
to get great sound. Reliability and sound quality must go together.D.C. amps really design themselves. They will TELL YOU what
output tube plate current you will run for a given combination.Fortunately, we have happy marriages of driver tube,
and output tube that offer stellar performance when connected
directly to each other.These combinations are Lucky Finds that we search for-- and
so far, have been able to find!One does have to consider what vacuum tubes are available,
are built right, and are excellent sounding also.-Dennis-
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Follow Ups
- RE: they won't listen ... - tube wrangler 01/24/2222:24:39 01/24/22 (0)
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