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The press release from Hafler-Dynaco is dated

"Vancouver, BC | May 9, 2016" so I'm not sure what you mean about tubes going out of production "at that time", since that was three days ago.

I have a New Sensor catalog in front of me from Fall 1995, and Sovtek was making a 5AR4/GZ34 as long as twenty-one years ago, and probably longer.

A single 5AR4 has always been over-taxed in a ST-70, as noted in David Gillespie's testing (link below), and building the amp with two, one for each channel, would have been a good idea.

Replacing it with solid-state rectification may be a good idea in many ways. But the press release, at least regarding the 5AR4 being out of production is misleading at best. After seeing Bob Latino's link to the lawsuit, it seems that that's the least of their problems.









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