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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: ARC D70II - slight buzzing - screen issues posted by Gofast on April 11, 2006 at 05:54:39:
>One other difference between the 2 amps: on this amp, when its >turned on, the screen bulb comes on in 1 sec, goes out in 3, and >then comes on again in about 15 secs, and then stays on.>On the older amp, the screen bulb only comes on after 15 secs.
You need a fresh european-made 12ax7 / Ecc83 in the screen power supply.
If you use an USA made (delayed-heater warm-up) or a worn tube, the heater supply will not self-stabilize within 15 seconds, therefore the noise.
To select a good tube, look for the ones that flash brightly when turned on. This is the norm for european tubes, because they were not made for TV sets.
You do not need to spend a fortune, a Miniwatt Ecc83 is a good choice, as are most Tungsram, India and Tesla tubes.
Also, the screen supply 6550 tube must be new and very strong.
Good luck
Carlos
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- Re: ARC D70II - slight buzzing - screen issues - Carlos 16:27:18 04/14/06 (0)
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