Choice of tube amp?

I`ll check it out, thank you for the tip :)

Steinhart doesn`t answer mails and I don`t do business with such firms. When one has to politely ask or make a lot of hassle getting in touch with them I say good riddance. So Steinhart wont see me taking my business their way. The 2 "Hottest" candidates are VAC Phi 300, Wolcott 140s or 280Ms or Moscode 401HR.

So there I`ve ordered Wolcott :)

Ralph/Atmasphere,

I'm confused by your following statement made in your 08-02-06 post:

"If you are running ESLs it is the nature of the technology that you will have to run tubes for best results."

vacuum tubes have always been voltage devices & have traditionally never been good at driving low impedances. That's why McIntosh tube amps often use autoformers at the output. IMHO, that is also why your amps use several tubes in parallel to both get the output power up & the effective output impedance lower.
How, then, can you state that tubes work the best w/ ESLs?

Also confused by this statement from the same post: "but it is only half successful as you still deal with a dry coloration that is inescapable with most transistor amps due to the characteristics of the speaker (including the impedance curve)."

The low(er) impedance of the ESLs should play superbly into the hands of a ss power amp as sourcing/sinking current into a low impedance node is where such designs excel.
I can understand & concede on the "dry colouration" aspect of ss amps vs. tube amps.

Sorry for the ignorance/stupid questions. If you could shed more light on your statements, I'd appreciate it. Thanks!

Bombaywalla, the first thing to do is drop the notion that tubes are voltage devices and transistors are current devices. While it is true that tubes run more voltage and less current, and transistors more current and less voltage, to think in black and white terms in this respect leads to confusion. Both devices actually are power devices. The two appraches do behave differently, but to ignore the power aspects of them is to ignore Ohm's Law, the fundamental law of electricity.

The Quad has an impedance curve that is not based on resonance; it is based on capacitance. As a consequence, at 50Hz (where there is a realitively high impedance) it needs the same amount of power to make 92 db as it does at 10KHz (where the impedance is much lower). An amp that puts out 'constant voltage' (i.e. most transistor amplifiers) will be bass shy and bright on a speaker like this. OTOH tubes will *attempt* to put out the same power with respect to these two different impedances, making for more linear response.

It is true that the newer Quads have lower impedances than the older ones (ESL57 and ESL63). This is an attempt to make the speaker more compatible with transistors, but ignores the very nature of the speaker itself. Thus tubes do have more troubles with the newer models. The ZERO is a solution, but Quad ought to rethink the scenario and at least offer a high impedance tap for tubes and a low impedance tap if you insist on transistors. IMO your investment in the speaker and transistors is not good as you will not realize the performance of either; quite simply its a mismatch.