Can we expect a fully shunt 2a3 conversion kit soon? -nt-
- Thread starter xcortes
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Paul Joppa
Moderator
I doubt it.
We did a prototype, but it turned out to be pretty difficult. There are heat and reliability issues, specifically with the current source that supplies the shunt regulator. It has to dissipate nearly twice as much power as can be easily handled by a TO-220 device. Whether we go to a larger TO-3 or use two or more TO-220 or TO-126 devices, or use a tube, it will take some engineering design and experimenting time to come up with a stable, reliable design that can be built as a kit.
What makes sense to me right now is fully shunt regulated 45 amps. Once the Stereomour is out and I have a bit of time, I plan to pursue that as the first step. So far, Doc B is not very excited about such a product, but as a designer I am so I'll probably continue to work on it. I want a pair for my own system, for one thing!
Remember, shunt regulation is very inefficient The regulator will usually dissipate at least as much power as the output tube, without contributing any audio power itself. And SETs are already quite inefficient.
We did a prototype, but it turned out to be pretty difficult. There are heat and reliability issues, specifically with the current source that supplies the shunt regulator. It has to dissipate nearly twice as much power as can be easily handled by a TO-220 device. Whether we go to a larger TO-3 or use two or more TO-220 or TO-126 devices, or use a tube, it will take some engineering design and experimenting time to come up with a stable, reliable design that can be built as a kit.
What makes sense to me right now is fully shunt regulated 45 amps. Once the Stereomour is out and I have a bit of time, I plan to pursue that as the first step. So far, Doc B is not very excited about such a product, but as a designer I am so I'll probably continue to work on it. I want a pair for my own system, for one thing!
Remember, shunt regulation is very inefficient The regulator will usually dissipate at least as much power as the output tube, without contributing any audio power itself. And SETs are already quite inefficient.
tsingle999
New member
I am excited about the stereomour as a SR45 product! I am currently addicted to the SR45 Paramour II. Taran
Bas Horneman
New member
Could you tell me more about the GM70?
Kind regards,
Bas
Bas Horneman
New member
Same here. Couple of months ago I bought the filament transformers....and this week some custom made teflon based sockets from ebay. Got parafeed transformers from MQ years ago.
Bas Horneman
New member
Thanks 2wo!
Wish Dowdy Lama would put up a schematic.
[EDIT] Oeps never mind. Found a description in one of the thread you posted. Essentially it is an 826 LC coupled to the GM70.
Kind regards,
Bas
Wish Dowdy Lama would put up a schematic.
[EDIT] Oeps never mind. Found a description in one of the thread you posted. Essentially it is an 826 LC coupled to the GM70.
Kind regards,
Bas
Bas Horneman said:Wish Dowdy Lama would put up a schematic.
Hi Bas,
I've read posts from Jim that hint at why he doesn't post schematics any more. It seems that when he did, some people would just throw the parts together and complain that it didn't sound good, etc. He believes in best practices for everything he builds, and it's not just the parts that make his designs work. It's one thing to build something sloppily at 400V, another at over a KV.
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