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In Reply to: none at all posted by wazoo on January 25, 2012 at 18:14:27:
Wazoo:
When I got my Marantz's, I was told when I replaced the original tubes, which were still very strong, to set the bias a little shy of the preset point on the meter. I did and haven't looked back.
When I got my Dynaco ST70 (when I was building my B Sytem), the bias point is 1.57mv and I played around with it for about a month to find the "sweet spot", and it turned out to be 1.48mv. Everything just seemed to bloom right there. Understand, I put NOS Mullards in and even though they were new tubes, after several hundred hours later and having burned in, I still find that between 1.45 and 1.50 is where they sparkle and just seem more relaxed.
I don't need to use a multimeter to bias the Marantz's, but I suspect they too are about 5% under the recommended bias point.
If you get the inclination, try biasing your VAC a bit cooler and see if you get more love out of it.
Jim
Nothing Sounds Better Than Tubes To My Ears! The Asylum where slander/libel is rampant...
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Follow Ups
- bias points - Medium Jim 18:29:01 01/25/12 (9)
- I did ;-) - wazoo 18:41:28 01/25/12 (8)
- RE: I did ;-) - Medium Jim 19:31:47 01/25/12 (7)
- milspec is also interesting - wazoo 20:34:20 01/25/12 (6)
- Graded milspec - esande 20:49:56 01/26/12 (2)
- RE: Graded milspec - Medium Jim 21:29:35 01/26/12 (1)
- RE: Graded milspec - Medium Jim 11:56:01 01/27/12 (0)
- RE: milspec is also interesting - Medium Jim 20:50:10 01/25/12 (2)
- JAN 5751's - MaggiesAndCats 09:53:58 01/26/12 (1)
- RE: JAN 5751's - Medium Jim 10:05:32 01/26/12 (0)
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