In Reply to: cathode stripping posted by Doc B. on March 6, 2007 at 17:41:38:
Hey Dan How are you. How is the VDH treating you, gosh I miss that midrange. Good reading article, thanks. Yes I know that the b+ switching causes stripping especially in high current high voltage applications but If you think about it every solid state rectifier comes on instantly and is at literally full HT before the 1st 2 seconds of turn on and is applying full B+ before the tubes heat up. Even your amps do that and I have not heard anything about Bottlehead gear that is negative in any way at all. In all fairness there probably is a negative effect especially considering the fact that amps today need re-tubing more often than the vintage stuff with tube rectifiers. The ARC amps we sold in NY went through tubes like M&M's ( early Chineese tubes) while vintage stuff just kept going.
I just don't like burning up those WE tubes 24/7.
Damm why do they have to be so good and spendy. I have a suspicion it is the caps forming much like the dreaded Black Gate warmup you have experienced except on a smaller scale since it is a MC preamp and possibly the 417a is more revealing. First thing tomorrow I am pulling the bleeder resistors and see if the stored charge in the caps reduces the warmup. It worked when I built a mu-stage using SKZ Black Gates.
Bob
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Follow Ups
- Re: cathode stripping - DHT 4 ME 18:43:37 03/06/07 (3)
- Re: cathode stripping - Doc B. 08:19:32 03/07/07 (2)
- Re: cathode stripping - DHT 4 ME 08:46:03 03/07/07 (1)
- Re: cathode stripping - Doc B. 12:31:08 03/07/07 (0)