From the AVAHiFi web site:
"The Ultravalve is our lovely looking and playing pure tube amplifier with a polished stainless steel chassis and a silver anodized faceplate.
The great grandmother of the Ultravalve amplifier is the original Dynaco ST-70, no big surprise. We started taking a close engineering look at the ST-70 in the 1970s and were able to identify several design weaknesses that could be fixed at a rational cost. These included getting the bandwidths of the power supply, audio circuits, and input acceptance into the right set of ratios so that no input signal short of output clipping could drive the unit into gross distortion at any frequency. This made the feedback loop's job much easier and the whole amp cleaned up a lot. We also added a solid reference to the screen grid resistor and achieved even better stability.
Later, we came up with some unique, successful power supply design ideas which we first implemented in other products. Learning more, we incorporated these concepts into a brand new design, the Ultravalve.
To offer you a unique high quality, rationally priced pure vacuum tube amplifier, we designed a lovely polished stainless steel chassis and added a double anodized faceplate.
The Ultravalve has premium input jacks, 5-way binding post output jacks on 3/4" centers for 4 ohm, 8 ohm, and 16 Ohm taps, a line fuse, and an standard IEC power jack and AC power cord. The chassis top has small pin jacks for bias adjusting and the bias adjust controls.
Dimensions: 13" wide, 10" deep, 7" high. Shipping weight is 31 pounds."
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This is a great amp! Please search on the web for the many great reviews. I was just listening to it this morning and it is set up for a listen if you happen to be in the Blue Springs Missouri area. I'm also selling an Audio by Alstine Fet Valve CF Preamplifier which matches very well with this amp.
I did take off the factory footers on this amp and will supply 4 vibrapods for feet for the amp. These feet are better than the factory feet in my opinion.
I will include a standard power cord.
This amp is in extremely good condition and looks great! Please review the pictures. Because of age and the lack of feet I'll rate it 7 out of 10.
I also have an extra set of tubes for this amp that will be included. All tubes are the tubes spec'd from AVA. I did not roll any tubes. The spare tubes are because I always wanted to make sure I had tubes if one went out so I just bought another set.
I'm the third owner of this amp I believe. Or at least that I know of. AVA sold it as used and I then bought it from the person who bought it used from AVA. I have owned the amp since 2014. I did send the amp back to AVA in 2015 for a checkup (I thought I had a tube problem) and it checked out just fine. No tube problem. Someone just didn't know how to run his volt meter for biasing. Please don't ask! But yes you do need to bias the tubes on this amp. The correct value is 1.6V DC. I will send all documentation with the amp.
I have the original box and will be able to ship after payment is made. Shipping will be at the buyers expense. Paypal only. I will eat PayPal fees. $900 for the amp.
