AVA Ultravalve Vacuum Tube Amplifier by Van Alstine


Does anyone have any knowledge or comments about this tube amplifier by Van Alstine?
 It’s said to be modeled after the old Dyna Stereo 70 amp.
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Interesting to the point I can understand about 10% of the content :) thanks for sharing this.

One thing he does point out that I know to be an issue, even with the modern versions of this amp—the tube rectifier. Per his article, “A much bigger compromise -- in my opinion -- is the use of a single rectifier tube to support a 70 watt amplifier.”

I swapped out my tube rectifier earlier this year for a Weber WZ68 (SS device), which has twice the rated current output as the single 5AR4 rectifier tube that came with my VTA 120—IMHO it resulted in a big sonic improvement when the volume is turned up.
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