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In Reply to: RE: 813 in triode posted by Tubenstein on May 09, 2016 at 23:45:52
Question : What is the efficiency of your speakers, that you are being drawn to big clunky obscure tubes ??
Such Finals often require extra stages and high current to drive.
With your Moniker, if you are into tubes, run 100 dB sensitivity speakers and you can use simple. easy to drive, good sounding Finals tubes.
Jeff Medwin
Follow Ups:
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/
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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