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In Reply to: RE: Triodes and speakers... posted by Interstage Tranny on May 26, 2014 at 19:27:46
when I first read the original post, I thought of recommending PP DHT's
my speakers are just a bit less efficient than the Tannoy Monitor Gold, and I do just fine for classical with DIY PP 6B4G's (6.3v filament, octal base version of the 2A3). I would like a bit more power for rock, so I'm building PP 300b's - not that I don't like my amps, but because I'm in the mood to build...
My amps are interstage coupled, fixed bias, choke input power supply, no feedback. I have taken them to club meetings, they walk all over SE 300b amps on 93-95 efficient speakers. They give up very little "magic" to SE's, but give plenty of tight, controlled bass.
If you like large scale music (symphonic, big band) on moderately efficient speakers, zero feedback PP DHT's are an excellent choice.
Follow Ups:
Thanks! If we leave out DIY amps at this point, could you suggest some vintage models? Which speakers do you use, btw?
My speakers are very loosely based on JBL L300's. 93dB efficiency. BUT, I use Edgarhorn "salad bowl" tractrix horns on the 2420 driver. For me, the tractrix horns get it right from a "tonality" perspective; no shout, no stridency, no honk. The 136a woofers go deep with authority (at the price of some efficiency).
Vintage PP DHT's are tough; not that many out there. The Brook amps are highly regarded but recently have gone for stupid "collector" money, and you would need a good tech to go through it. I think Cary made (makes?) a PP 2A3. You might want to investigate getting a custom builder to make you an amp. Something like the Seth PP 2A3.
- "Something like the Seth PP 2A3."
I thought that 6C45's were pretty scarce nowadays.
Dave
Sovteks seem to be out there for $30 or so. The Seth was an example for suggestion, more or less.
I always use 5842/417A for my builds, though it is getting pricey too (especially non-Raytheon).
My mistake. When I did a search yesterday, all I saw was out of stock. I see The Tube Store and others have them.
Dave
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