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Vintage threads from the first ten years

previous: M/J OK Guys, I just tried something el... -- 9/2/1999 1:05 AM

Re: update

9/2/1999 1:37 AM
SpeedRacer	Re: update I use 5W for the 1K screen resistors, just habit and that's what I use for the Marshalls. (fewer parts to order!) It prolongs tube life by limiting screen voltage on big swings. While we worry about plate dissipation, the thing we often can't track so well is how hot the screens are getting. The most common tube failure mode (IMO) is the screen shorting.. it is after all, only a wire swaged in place on a couple posts. It gets hot, sags, and boom - you're outta biz. Keeping the screens cool is a great way to keep your tubes alive. The screens can glow bright orange on overdrive (it's easier to see on EL34's where you can peek through the plates) check it out. Glad you've found a good setting for your DR btw!

9/2/1999 1:37 AM

SpeedRacer

Re: update

I use 5W for the 1K screen resistors, just habit and that's what I use for the Marshalls. (fewer parts to order!)

It prolongs tube life by limiting screen voltage on big swings. While we worry about plate dissipation, the thing we often can't track so well is how hot the screens are getting. The most common tube failure mode (IMO) is the screen shorting.. it is after all, only a wire swaged in place on a couple posts. It gets hot, sags, and boom - you're outta biz. Keeping the screens cool is a great way to keep your tubes alive. The screens can glow bright orange on overdrive (it's easier to see on EL34's where you can peek through the plates) check it out.

Glad you've found a good setting for your DR btw!