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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: Re: Rectifier Flashing.... posted by Derick on September 7, 2002 at 13:26:12:
Derick, as Steve rightly points out, the 5V4 is NO sub for a 5U4G, and in a Sun amp, it pumps way too much current for a 5V4 to handle. The 5V4 is rated MUCH less than a 5U4. When you see arcing on startup, you are causing damage to the amp. Continued use of a 5V4 in this amp will cause power supply cap failure, and when they arc for the last time before blowing out, they may very well take the power tubes with them.You should never do this kind of thing, subbing a wrong tube in is almost always a disaster waiting to happen.
In the Sun amps, you can sub a 5AR4 (only a NOS one) for the 5U4G, this will reduce the headroom a little and raise the operating point of the power tubes. It is also ok to sub a 5R4, this will drop the operating point a bit and give a slightly more open sound.
The Mullard 6X4 flash at startup is typical of genuine Mullard tubes and is no issue.
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Follow Ups
- Re: Rectifier Flashing.... - Robert H. 14:01:50 09/07/02 (4)
- Re: Rectifier Flashing.... - Derick 14:42:54 09/07/02 (3)
- Re: Rectifier Flashing.... - Robert H. 15:52:37 09/07/02 (2)
- Re: Rectifier Flashing.... - Derick 01:01:02 09/08/02 (1)
- Re: Rectifier Flashing.... - Robert H. 05:46:15 09/08/02 (0)
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