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In Reply to: RE: 813 in triode posted by drlowmu on May 11, 2016 at 09:31:06
Not necessarily: the 813 is very easy to drive in pentode mode, easier than a 300B for that matter.
The RH813 is almost too input sensitive for my taste: it would work perfectly fine with a selector and a pot as an integrated amp, or with a passive preamp if one prefers the versatility.
******
http://rh-amps.blogspot.com/
Follow Ups:
The 813 is an easier load than a 45....by nearly 50%, so don't worry about the 2A3, let alone the 300B.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
Well not that easy a load as a 45 - in the RH813 you still need to swing some 60V peak (120V P-P) which is similar to a general 300B amp. Nevertheless, it's an easy load alright - just like all other pentode/beam-tetrode tubes.
******
http://rh-amps.blogspot.com/
With a B+ suitable for an 813, driver output voltage should not be an issue. The 4E27 amps I built run the driver supply out 20% taps in the OPT's primary.
cheers,
Douglas
Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
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