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In Reply to: RE: Full Monkey amps posted by Thorsten on November 14, 2010 at 07:41:23
And would it put out 12W+ RMS?
"What did the Romans ever do for us?"
Follow Ups:
Hi,> For the 211 what driver, what PS voltage?
You could use E810F or D3a or many others.
The 211 in a slight Class A2 Setup (Audio Note Japan Ongaku Style) needs no more drive than a 300B.
With an E810F driver you would need around 1250V +B and the 211 cathode will be at around 250V.
Power Output? Near 20 Watt I'd guess. The ANJ Ongaku claimed 27W.
I am not suggesting to build such a beast (there is however in my little black book a small design study, with a silver/permalloy TVC, a D3a Driver and full monkey/DRD style circuit with silver/permalloy anode load choke and silver/permalloy parallel feed output transformer plus silver parallel feed cap. Sadly the potential customer got way scared when all was priced out, so it remained a study.
As vhrynchuk points out, any 211 Amp (DC coupled or not) represents a substantial challenge and using one of the Super 300B's (or even just a plain 300B - I mean I get 16W from that alone) can get you as much power at lower voltages and with easier to get transformers etc...
I used the 211 example merely as illustration that there was no real limit to the full monkey design in principle.
Ciao T
Sometimes I'd like to be the water
sometimes shallow, sometimes wild.
Born high in the mountains,
even the seas would be mine.
(Translated from the song "Aus der ferne" by City)
Edits: 11/14/10
Holy smoke! Thanks.
"What did the Romans ever do for us?"
211 is not the best tube for DRD. The anode voltage for 211 only has to be around 1KV. So for DRD is around 1.3KV. The plate impedance is more than 3KOm which demands an output transformer 15KOm on primary to have a good damping factor. With mu 12 you will need DC on the filaments. All in all for 12 Wats of output power it doesn't worth all efforts. If you need 12 Wats 300BXLS from EML or Kron will sound much better and will cost less despite the price of the tubes.
and take a look at the 211/vt4-c plate curves ...
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