Appologies...
I've had a quick rumage around and pulled the book out. Jones calls it 'The beast'!
It's SE input with 2 constant current differential pair stages and 2x 845 triode outputs in PP.
An OP choke is used, (like a PP output transformer with no secondaries) and the ESL is connected across the tube anodes with 4.7 nF caps. Elegant design, but the PSU is complex!
Still, if you really want to do it...
Great book... Get a copy!
I've had a quick rumage around and pulled the book out. Jones calls it 'The beast'!
It's SE input with 2 constant current differential pair stages and 2x 845 triode outputs in PP.
An OP choke is used, (like a PP output transformer with no secondaries) and the ESL is connected across the tube anodes with 4.7 nF caps. Elegant design, but the PSU is complex!
Still, if you really want to do it...
Great book... Get a copy!
Direct drive of an ESL 😱 This is just the sort of thing we need!
Of course there are some fun safety issues with multi-kV speaker cabling. Perhaps there really is a genuine use for these http://www.cableisolators.com/ after all
I guess the slew rate figures for such an amplifier would also make for interesting reading!
ESL and planar magnetics are really electrical complements to each other, one derives its principal force from voltage, the other from current. Luckily, semiconductors can give us a direct drive for high currents.
Ed
Of course there are some fun safety issues with multi-kV speaker cabling. Perhaps there really is a genuine use for these http://www.cableisolators.com/ after all
I guess the slew rate figures for such an amplifier would also make for interesting reading!
ESL and planar magnetics are really electrical complements to each other, one derives its principal force from voltage, the other from current. Luckily, semiconductors can give us a direct drive for high currents.
Ed
Ed Holland said:
I was more thinking of signal cable through the room, amps safely in the ESL 'cage'.... sort of like an 'active speaker' idea...
Vince.
There is also "Daughter of the beast" for electrostatic headphones!, employing both halves of 6BX7 for PP output. No chokes or transformers on the output of this one... Just 6 x 2M2 resistors, and 10nF coupling caps.
Hi,
I saw the "Electrostatic Beast" in the 2nd edition too,
and it was for loudspeakers, but as I remember he metioned to
have never build that beast.
Frank
I saw the "Electrostatic Beast" in the 2nd edition too,
and it was for loudspeakers, but as I remember he metioned to
have never build that beast.
Frank
The fun is having the beast in the cage....
No really, I have ESL57 speakers and during a test a leaf of one of the plants in my room touched the 6kv output of the charge tranny, smoke, sparks and a big brown spot were the result....
Don't wanna know what would've happened if I had touched it myself...
No really, I have ESL57 speakers and during a test a leaf of one of the plants in my room touched the 6kv output of the charge tranny, smoke, sparks and a big brown spot were the result....
Don't wanna know what would've happened if I had touched it myself...
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