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In Reply to: RE: Yet another Stereo 70 posted by mbnx01 on May 09, 2016 at 10:20:14
One of their bullet points on the new Dynaco amp says:"The original 5AR4 tube has been replaced by Solid-State rectifiers, thus removing the 5AR4's inherent losses and reduced regulation, while eliminating a failure-prone out-of-production tube in the process."
While a 5AR4's "inherent losses, reduced regulation, and prone to failure" are open to debate, the fact that they are still in production, from multiple sources, is not.
It sounds like TAS was simply publishing ad copy they were handed. You would imagine that any competent reviewers of tube audio equipment should be aware that the 5AR4 isn't "out of production".
Edit: Oops. It does say, "The following is a press release issued by Hafler-Dynaco" right at the beginning of the article.
Edits: 05/12/16Follow Ups:
I think at the time of that press release ALL tubes were going out of production.
There was a non related posting over at the vintage forum about how McIntosh started offering a trade in program of their old old tube amps for new SS amps. They claimed the out of date tube amps no longer had replacement parts and tubes. So they offered a trade in.
makes you wonder what happened to all those McIntosh tube amps that did get traded in??????
"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.
that the company producing this item is unaware of parts availability for it and making bizarre design decisions based on - who know's what? I mean, they're making a tube amp but claiming that tubes are out or production?
Really?
Big J
"... only a very few individuals understand as yet that personal salvation is a contradiction in terms."
...Got their 7199 mixed up with their 5AR4.
The post I was referring too was about tube amps some where in the mid to late 60's. Not the present.
At THAT time I actually remember seeing tube stereos being chucked out in the thrash. My neighbor who was apparently an audio nut had died. His widow asked ME if I wanted any of this stuff. Of course being a stupid kid and not knowing what the future held I said no. The next day there was a pile of stereos, tubes and what not about four feet high and four feet wide. I'm sure that pile could have paid for my house AND car at today's market values.
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