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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: why top of my 2a3 glass envelop change color? posted by bouncy ball on May 20, 2012 at 05:43:37:
Q. " I am running my new car continuously at 100 MPH on the freeway, and the bright red color on the cam cover has changed to dull red, .....what should I do " ??A. Slow down to 62 to 70 MPH. and enjoy the scenery some.
You are running the tubes at 15 watts plate dissipation, which is their maximum dissipation. This means you will NOT get great tube life from them, and that they are now continuously degrading. Additionally, they are now operating thermally stressed, and they SOUND that way.
The tubes will last tens of thousands of hours, and, (if your internal wiring and layout is sound), the amp will be more relaxed, less stressed sounding, if you REDUCE the plate dissipation from the 15 Watts to about 10 to 10.5 Watts.
To reduce 2A3 dissipation and current draw requires (1) a proper DC voltage on the 2A3's grid, and usually simultaneously, (2) a higher value self-bias (Rk) resistor.
Jeff Medwin
Edits: 05/21/12 05/21/12
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- RE: why top of my 2a3 glass envelop change color? - drlowmu 06:26:28 05/21/12 (0)
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