Acoustat servo amps ??

I owned the "monitor III" speakers with their "servo-charge" amps for 18 years, having purchased them in 1979. The "model III" succeeded Acoustat's attempts at selling a tube-powered speaker. Acoustat offered a couple upgrades over the years to the amps that involved replacing capacitors, I believe. They definitely helped on the low end and with clarity. Joe Curcio offered a $2000 mod to the amps that involved replacing part of the diode circuit with tubes. The power tubes were 6hb5's, which are unique to this amp, so may be getting a bit hard to find. I sold my speakers a few years back for about $650. If you're lucky you might find someone selling them locally. They were a great pair of speakers, but had their own issues and quirks.

Kubla, if you send me your phone number I'll give you a call and share my 23 years of experience with Acoustats. I am a former dealer who sold monitor IIIs and have had 2+2s for the past ten years. Just bought another pair of 2+2s this week (these have the Medallion interfaces) and haven't even uncrated them as yet. Don

If you want to hear Accoustats at their best, the servo amps are the way. One of the best stat systems I have heard over the years was a pair of Accoustat 2+2's with servos. Unfortunately, the servos are hard to find and expensive when you do find them these days. There is a cult for these amps, so most of them have been hunted down and are in the hands of people who know their worth. I have a friend with a pair but he won't part with 'em...just in case he gets "Accoustat Fever" again. Happy Hunting!

Well, yes, the servos can be great, but there are MANY different mods and levels of servos -- the best (and most lethal, literally) in my experience, are the AHT/Dan Fanny modified units that use the 6LB6 tubes and dual 7308 input drivers. Please note that high-voltage parts are sometimes hard to locate and these amps do require regular periodic maintenance to ensure top performance and to replace certain components BEFORE they disintegrate.

One advantage to the 6LB6 servos is that they can drive up to 8 panels per amp -- so if you own Acoustat Sixes or Eights, you don't need 2 amplifiers per speaker; one will do nicely.

Of the Acoustats I have owned the ones that I liked the best were 2+2s and IIIs. The Sixes are great with the AHT-modified servos if your listening room is VERY large (mine wans't big enough). They are capable of playing unbelieveably loud, with tremendous bass. A few of my friends own these systems/amps and are quite happy. :)

I have since moved on to the InnerSound Eros because it plays loudly and precisely, is smaller, and I no longer have to worry about dealing with the attention the servos require.