What's the greatest bargain in SET these days?


Hi, Gang,
I response to my recent review of the Reference 3A De Capo BE speaker, someone wrote that if you really want to hear them sing, you should try them with a SET amp, or words to that effect.
That got me thinking. The De Capo's are 92 db efficient, which (correct me if I'm wrong) seems kind of borderline for low-power SET amps.
In any event, right now I'm running mine with a pair of Manley Mahi mono-blocks. They are switchable from triode (20 watts) to "ultra linear" (40 watts). I run them in triode all the time, and in my room, the volume knob almost never goes past 9 o'clock; more would just be too loud.
All that said, what do you guys think of running the De Capo's with a SET amp? And if I did, what's the best bargain in SET's these days?
Thanks!
rebbi
Charles1dad,
Good question.
The Bottlehead's trannies are made in the USA by Magnequest, apparently. Magnequest also sells upgraded transformers (several levels of them running $400 to $650) for the Paramount kit. Paul Joppa, the designer, says that they do make a subtle difference but not as much of a difference as tube rolling or, say, upgrading caps. I should add that the Paramount (like Bottlehead's other kits) used solid state rectification. Anyway, Bottlehead is a class act, in my experience, and although some people love to tinker and upgrade the original parts, I feel confident there's no junk in that kit. Paul Joppa is an electrical engineer and respected designer, so I trust that kit.
Now, at least from the photos on the AN web site, that kit seems to have some serious "iron" in it. There are four big transformers in that integrated. Now, it seems that you have an option at the time of ordering our kit to deduct $75 from the price and then order upgraded components from an outfit called Parts Collective in the UK. It's not clear to me from the web site what parts they leave out when you take that route, and I've written to ANKits to try and find out.
Got one other question for you, Charles:
So, that Art Audio PX-25 is still apparently unsold. Let's assume the PX 25 tubes need to be replaced to straighten out that bum tube that the seller says is humming somewhat. Would you still try to cut a deal for that amp? And just how weird-a** is that PX-25 tube, anyway? Lots of online dealers don't even seem to stock it.
Rebbi,
I have respect for Paul Joppa and his bottle head products. AN Kits have really eared a strong reputation for their design,part quality options and built. Both of these are to a degree built to fit a price point. This is why upgrade options are offered.

Art audio begins at a higher price point, their stock parts are the other two amp's higher upgrade level. I would lean toward the Art Audio and replace the bad tube. This is a very highly regarded SET amplifier. The PX 25 is less common than the 300b but they are certainly available.
Any of these 3 choices are good at their price point. A used Art Audio in good condition is very tempting.
Again, I don't like to rain on anyone's parade, but fwiw:

The PX-25 is rated at either 5 or 6 watts, depending on what specs are looked at. The Art Audio Jota, another SET amp, is rated at 20 watts or more, depending on tube choice. Here is a comment that was posted elsewhere a few years ago by one of our particularly knowledgeable and experienced members, Jazdoc, who uses Daedalus Ulysses speakers (which I also happen to have), which are MUCH more efficient than the de Capos:
I tried my Ulysses with the high current Art Audio Jota. It was great at low volume but audibly ran out of gas a mid-high listening volumes.
I have nothing but the greatest respect for the credibility and opinions of both Charles and Jazdoc. I have no experience with Art Audio products, and I have no idea how to reconcile these seemingly conflicting inputs. But I thought I should point this out.

Best regards,
-- Al
Common Sense Audio offers a 300B-based integrated under the name Audio Nirvana for $1.5K that, to my ear at least, was not far behind a similarly-spec'd Audion amp that costed four times as much. Could be worth looking into. See here for details:

http://www.commonsenseaudio.com/nirvanaamps.html

(To be clear: I am not in any way affiliated with Common Sense Audio...just liked what I heard)...