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.

rvpiano03-13-2019 5:28pm

gochurchgo Details Discussions Posts This discussion Message User 910 posts 03-14-2019 at 03:08am Copy Comment URL Report Comment Edit Delete I had chatted with him about a system I was looking to put together. I don’t know much about tubes and he was quick to answer all questions. ultimately the answer to any question about any of his amps was his dynaco style amp. So I bailed. i May still consider his TOTL tube pre though. nice guy.
Post removed Mar 14, 2019
jsl1234 Details Discussions Posts This discussion Message User 36 posts 03-14-2019 at 02:12pm Copy Comment URL Report Comment Edit Delete 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.
Post removed Mar 14, 2019
jsl1234 Details Discussions Posts This discussion Message User 36 posts 03-14-2019 at 04:16pm Copy Comment URL Report Comment Edit Delete Thanks for the clarification—cheers!