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In Reply to: RE: Which SET is next logical "step up" from 300B? posted by Funky Bob on June 04, 2022 at 03:29:00
Looks like these very low powered SET amps are rare as hen's teeth. Not into DIY and prefer something that I can easily buy and sell on the used market. Thanks.
Edits: 06/05/22Follow Ups:
There are three James Burgess built SET amps offered on US Audio Mart: a 2A3, a 45/2A3, and a 47 (actually a pentode but can be switched to triode.) Disclaimer: I have no connection to or interest in these sales, but I do have a Burgess built JE Labs 76 full feature preamp--he does great work.
That was my amp! The 45/183/VT52. I have a 183 now and a 801A.
845 tube amp. Some state the 845 is superior to 211 amps.
From Tube Audio Labs.... He can build you a pair of these! Jeff Korneff Design 45 MonoBlocks - Mirror Image with the Finest Components.
Edits: 06/07/22
From 250 Hz up on 104db horns? It's not very comparable to most of the SET implementations.
Correction: --- I use 115db Horns. And All Oris Horns are Bi-Amped. And I believe Edgarhorns and Avantgarde Horn Systems are Bi-Amped as well.
Hardly, not comparable as you say. SET implementations are 'made' for Horn Systems IMO.
I agree that SET'S are made for horn systems and I have no doubt that your 45 monos sound wonderful in your implementation. I only remarked ( clumsily admittedly) that somebody with Heresy like boxes sporting 12" or 15" with 93-96 dB efficiency will have very different results with such amplifier even in a small room. I'd rather recommend move into opposite direction, 300B PSE or big bottles or different set of speakers and bi- amplification
I don't disagree with that.... Although I have seen people with speakers in that sensitivity range use Korneff Amplifers in a small room and are completely satisfied with it. So, there are no Hard and Fast rules when it comes to this topic.... Individual Volume Tastes, Room Size etc. etc.
Inmate 'The Killer Piglet' comes to mind.... Korneff 45 Amps and Omega SAM speakers (94.5db)
Inmate The Killer Piglet System
I own Rehdeko RK-125-5s FR speakers. Kindy of chunky bastards with flat 8 Ohm impedance and 96 dB. Not much bass from 10" driver either and my 45 monos can't do it in 100 Sqft bedroom . 300B on the other hand can and very nicely so.
OT, but is the 6SN7 driver stage in your Corneff monos using both halves of the triode in parallel or just a single triode ?
Edits: 06/08/22
Not sure, but here is the Schematic from a Magazine Article that Jeff Korneff used to build his 45 amplifier. In his e-mail to me last year, he attached this article.
Gordon Rankin (one of the originalist SET amp builders) offers a commercial monoblock amp, the Corona, based around many of the low power triodes (50, 45, "others"). He's not a fan of the 2A3 however, but I'd bet he'd build one if you wanted it. I have a 20+ year old 300B integrated of his that is mothballed at this point, but it's a very solid build and sounds wonderful.
I have no idea what his current prices are ($$$ likely), website isn't the greatest, but he does respond quickly to emails. He's posted here several times (when he has the time) so you can do a search and get an idea of what he has to say about SETs and tubes.
Triode Labs (triodelab.com) also has several SET offerings as well that look nice although I have no experience with them. Really pretty slim pickin's on commercial SET amps these days.
Many more on here with much more experience than me, but mostly DIY suggestions whenever this topic comes up. I don't DIY either. Always wanted to try, but physical limitations exist that prevent me from being capable.
They have a few different models in 2a3 and 45
Here's another... TAL will build SET amps of most any design. I had him build a pair of Jeff Korneff Clone 45 Monoblocks last year. They are superb! - He's got a Portfolio on his website of all of the various designs that he has built over the years.
Edits: 06/05/22 06/05/22 06/05/22
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