I want to build a cost no object transformer input, transformer coupled single ended 0 feedback high power class A amplifier :
Most power that could be attainable from such a device ? 100+ Watts ?
I'm thinking active cooling with paste and large CPU heatsinks, custom transformers if nothing would be available.
But it has to sound good.
Most power that could be attainable from such a device ? 100+ Watts ?
I'm thinking active cooling with paste and large CPU heatsinks, custom transformers if nothing would be available.
But it has to sound good.
Such an amplifier like described under
https://www.diyaudio.com/community/threads/zero-feedback-impedance-amplifiers.42259/
but with more output power ?
I would ask Mr. Nelson Pass and Mrs. Susan Parker.
A commercial Product of a single ended version with transformer was design from Mr. Tim de Paravicini (EAR M100A)
https://www.diyaudio.com/community/threads/o-h-schade-1938-meets-mosfet.144105/ (post #20)
https://www.stereophile.com/content/earyoshino-m100a-monoblock-power-amplifier-measurements
https://hometheaterreview.com/ear-paravicini-m100a312-tube-amp-reviewed/
https://www.hifinews.com/content/paravicini-312-preamp-and-m100a-monoblocks
https://web.archive.org/web/2009012...ravicini_m100a312_tube_amp_reviewed002186.php
https://web.archive.org/web/20050302224226/http://www.envogue-24.de/Neue Seiten/ear/M100A.html
Here an overview from me (most links are probably dead - use web-archive in such cases):
https://www.diyaudio.com/community/...ntegrated-and-power-amplifier-devices.146528/
Erik: I want to power some ESL's
About the EAR M100A : i don't have 52000 USD at the moment
, but it does look nice though a custom version should be much cheaper, i expect.
I'm set on the following :
Single ended, 0 feedback like in transformer coupled tube amplifiers, like the Wavac, ongaku, AN Kits Transformer coupled version, etc.
Fully transformer coupled, no capacitors in the signal path, transformer input AND output
To reach the 100watts parallel would be an option. Wouldn't it require perfect matching of transistors, and with the SIT prices, that would be a problem.
I will be using active filtering so i could perhaps work with 75w for the midrange and tweeter of the ESL, but 100 would be better.
I would like to use external supercap PSU.
I only found 2sk180 Tokin SIT. If you know of any high powered ones that may still be found, i would like to know.
Roland.
About the EAR M100A : i don't have 52000 USD at the moment
, but it does look nice though a custom version should be much cheaper, i expect.I'm set on the following :
Single ended, 0 feedback like in transformer coupled tube amplifiers, like the Wavac, ongaku, AN Kits Transformer coupled version, etc.
Fully transformer coupled, no capacitors in the signal path, transformer input AND output
To reach the 100watts parallel would be an option. Wouldn't it require perfect matching of transistors, and with the SIT prices, that would be a problem.
I will be using active filtering so i could perhaps work with 75w for the midrange and tweeter of the ESL, but 100 would be better.
I would like to use external supercap PSU.
I only found 2sk180 Tokin SIT. If you know of any high powered ones that may still be found, i would like to know.
Roland.
Look for more info in this thread. I also see (just checked) a few larger disc shape 1000W 2sk182 (not es) and 2sk183 (look carefully at the cluttered image) offered in e-pray , US location. A single part should be able to deliver ~150-200W in SE.
When driving ESL my first thought was the big OPT from Monolith Magnetics, used by member Magz for his 833 SET - but then wired in reverse: SE solid state amplifier on the primary, and the secondary for direct drive of the ESL (of course it would be better to look for optimized turn ratio, but there are HIFI transformers available for this sort of power level and application).
Transformer can be found on the Monolith website, loo for SA 833.
Transformer can be found on the Monolith website, loo for SA 833.
Actually there is another option to cascode the last power device with high voltage tube and directly drive the ESL panel, similar to what Jan Didden is doing. Sound quality should be much better compared to transformer coupled system.
I agree with this, still did not mention it because of the high voltages involved in the amplifier section. But yes, it has potential for higher SQ!
from EAR's M100A are still no information in detail to find except this review:
https://www.stereophile.com/solidpoweramps/earyoshino_m100a_monoblock_power_amplifier/index.html
and this description:
https://web.archive.org/web/20080222081440/http://www.envogue-24.de/Neue Seiten/ear/M100A.html
go also to post #8 under
https://www.diyaudio.com/community/threads/o-h-schade-1938-meets-mosfet.144105/
Are there simplified schematics and internal images anywhere ?
P.S.: the distortion character from the diagram (last attachment - from fig. 8, review in "Stereophile") could indicate a fault in a component.
https://www.stereophile.com/solidpoweramps/earyoshino_m100a_monoblock_power_amplifier/index.html
and this description:
https://web.archive.org/web/20080222081440/http://www.envogue-24.de/Neue Seiten/ear/M100A.html
go also to post #8 under
https://www.diyaudio.com/community/threads/o-h-schade-1938-meets-mosfet.144105/
Are there simplified schematics and internal images anywhere ?
P.S.: the distortion character from the diagram (last attachment - from fig. 8, review in "Stereophile") could indicate a fault in a component.
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