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Old 9th May 2004, 04:45 PM   #31
Fuling is offline Fuling  Sweden
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Ill run them at about 430-440V and 90-100mA, so somewhere between 39 and 44W.
I think 811As are built to do some serious work in professional and military equipment so I guess we would have to run them really hard if were going to burn them out in an audio circuit.

BTW, they are cheap enough to buy some spares.
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Old 9th May 2004, 11:20 PM   #32
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Yes. Tube dealer here in China quotes me 50 yuan each for Shuguang-made FU811, or nearly 6 US dollars. Quite cheap for you but still a little bit dear to me.
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Old 10th May 2004, 06:26 AM   #33
Fuling is offline Fuling  Sweden
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6 USD?

I paid 250 SEK (30 USD) each for mine, chinese made. American NOS are more expensive. Still cheap for being big DHTs I think

Well, the bottom line ist that I dont think lifespan will be much of a problem here.
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Old 10th May 2004, 07:06 AM   #34
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I bought 4 jan cetrons for 50usd and 45usd for 5 rcas. Running it as 44watts would that be close to its max plate dissapation? why do you think it would not effect the life span?
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Old 10th May 2004, 09:54 AM   #35
Fuling is offline Fuling  Sweden
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Since theyre made for continous duty at 45W it should be just fine.
These are tubes made for serious work, remember
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Old 10th May 2004, 01:17 PM   #36
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The quoted FU-811 is "J" grade, or millitary grade. They are quite study and feature high stability to stand hostile environment, such as battlefield.
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Old 10th May 2004, 04:05 PM   #37
Fuling is offline Fuling  Sweden
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Quote:
high stability to stand hostile environment, such as battlefield
Might be necessary when I listen to parts of my record collection
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Old 11th May 2004, 04:28 AM   #38
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Can SE do well in replaying heavy metal or synphony with great dynamics? I prefer to use my EL84 SE for guitar, violin and sweet songs sung by female singers.
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Old 11th May 2004, 07:33 AM   #39
Fuling is offline Fuling  Sweden
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I remember that these A2 amps worked particulary well for reproducing all kinds of rock music. A lot of power and "drive" and, with some feedback applied, great bass response.
I will use adjustable feedback to "tune" the amp to work together with my dipole speakers.
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