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In Reply to: RE: Andy, Al, Triode-Kingdom, and Mr. X, I agree with you posted by drlowmu on September 12, 2014 at 12:14:51
IMHO is the 6A5G. Always dead quiet, same power and linearity as a 2A3, no heater to cathode issues which is limited to 200v max on the 6AH4.
You can run one and it's driver (assuming 6.3v) off the same filament winding. So you need only 2 6.3V/2A windings for a stereo amp. One more if you run a tube rectifier. If direct coupled the driver must then meet heater/cathode ratings, or add a separate filament trans for the drivers.
If IT or RC coupled then just 2 is fine.
Follow Ups:
The only IDHT I know that can cope with a good DHT is the French R120 from Radiotechnique or Dario. It was mentioned as a good sounding tube by Jean Hiraga, the man who brought the attention of small DHT's and horns back to Europe and the US when most of the best stuff had gone to Japan or to the dump.
The very first SE amp I made was with R120, and I can confirm they are really good sounding.
I love those tiny cathode sleeves on the 6a5g with the insulated heater wire inside.
Call me when you get a chance and I'll tell you about the guy in southern Oregon.
Tre'
Have Fun and Enjoy the Music
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