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In Reply to: RE: Tube heat posted by Caucasian Blackplate on March 03, 2014 at 21:24:54
Can I assume then that the 211 & 845 are about the same in this respect ?
Thank you
saki70
Follow Ups:
The 211 can't quite cook off as much power on its anode (75W), but it's pretty close.
Well thank you all for the schooling .
I have my question answered and picked up some knowledge too .
Very much appreciated .
saki70
Well, again, I'm drawing on knowledge I've gathered elsewhere, but here's my take on this:
- They draw the same heater current, so given the 845 can output more wattage, economies seem better with the 845.
- Lower plate resistance is apparently better for audio. The 845 has a plate resistance of 1.7k versus the 211 with 3.6-4.4K. If the assumption is correct, the 845 should be the winner here.
- Control grid-wise, they're very differently spec'ed. (80V peak versus 150-190V to the grid)
http://frank.pocnet.net/sheets/049/8/845.pdf
http://www.hifitubes.nl/weblog/wp-content/rca-211.pdf
I know nothing about SET circuit designs, but to me, driving an 845 would be a little more "involved" tube-wise than a 211. A lot of 211-based amps I'm seeing on the net can get away with using small and mid-sized signal tubes to the drive the 211's grid. As seen in the supplied photo, this 845 tube amp is using KT66s!!!
I hope others can chime in, because that's pretty much the extent of what I know.
God, all this talk of big triodes is making me moist for one now hahahahahaha
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May your tubes be lively and long-lasting. Holy be thy heater.
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