SET Amp question

Depends in part on the amp's output impedance and the speaker's input impedance.

Oversimplifiying a bit, a high output impedance (low damping factor) amp will put out increased power into an impedance peak, and decreased power into an impedance dip. In contrast, a typical solid-state amp will have the opposite characteristic.

So if the speaker was "voiced" on a solid state amp, and its impedance curve has significant peaks or dips, the resulting tonal balance will probably be quite a bit different on a typical SET amp, regardless of whether the amp has enough power to drive the speaker to satisfying levels. For example if your solid-state-voiced speaker has an impedance peak at 3 kHz, it will probably sound too bright and forward with a SET or OTL amp - and you would be mistaken to lay the blame on the amplifier, as the cause would be poor synergy.

Duke
dealer/manufacturer

Nothing good (unless you go to higher output tubes).

The Verity Parsifal/Encore is a modestly difficult load and it swallowed my Cary 300B monos whole. OTOH, the Cary 805s work just fine with the P/Es. Never even thought to try the 300Bs with my Ohm 100s (which seem to like more, more, more when it comes to amplifier muscle). I'd bet that the 805s would work, but I wouldn't expect improvement over the ARC VT130SE I'm now using, so I'm not about to schlep the 805s into the listening room in anticipation of degraded results.

The problem is that -FOR THE TRUE BELIEVER SET GUY- the low powered amps are the only true key to a happpy life. Flea powered designs just won't work in the type of application you describe and even 300Bs IME will struggle. You're left with the 211/845 designs which will probably provide decent results, but:

A) won't sound their best in such a pairing,
and
B) may not be "SET" enough to satisfy the experiment.

Just my experience.
Good Luck.

Marty

Good answers guys. Thanks!

The Cary 805 AEs are honestly hard to fault in comparison to even the best SET amps (which to me are 45s). I never did any sort of A/Bing because you wouldn't use the two on the same speakers - but the AEs are no slouches in any department.

To get a hi-power SET (anything stronger than a 300B) to sound really good takes a great deal of money in the power supply and output trannies. There are no good, cheap 211 or 845 SETs. Not really good anyway. The bargain gear does still give some SET sound but will be slow and rolled-off due to the inevitable bandwidth restrictions.

Pardon from the semi thread jack.
Is there anything that will minimize the speaker SET interaction. e.g. bigger, shorter speaker wire: adding additional stuffing inside the cabinets: changing bias voltage. Any suggestions?