In Reply to: Re: COUNTERPOINT SA-4 posted by lone gunmen on March 6, 2006 at 09:41:15:
I don't think there is anything inherently wrong or unstable about the 6LF6. Julius Futterman knew what he was doing when he selected them for his last crop of amplifiers. But as Alta Vista notes, the 6LF6 used to be plentiful and cheap. When I owned Futterman amplifiers, I could buy 6LF6s at local radio supply stores for a few dollars a piece. As for stability, one pair of Futts that I owned lived for 10 years on one set of 6LF6 output tubes. At this time, one has to go to the esoteric tube dealers to acquire 6LF6 replacements at a relatively high cost. In the modern era, most makers of Futterman-type amplifiers, e.g., Transcendent, have gone over to the PL-509, also variously known as EL509, 519, etc. These are still available at reasonable prices. I wonder why Alta Vista has not worked up a conversion option, so that one could use the latter tube type in the SA4. This would be as much of a boon to its continuing existence as is the added balancing circuitry.
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Follow Ups
- Re: COUNTERPOINT SA-4 - Lew 07:12:58 03/07/06 (1)
- Re: COUNTERPOINT SA-4 - lone gunmen 08:49:29 03/07/06 (0)