[Amps] 3-500Z Troubles

[Gary McAdams]

Gents,

Having been a service technician for a long time, all I can say is: If every
problem a group of machines exhibited was due to one single cause, I would
have been out of a job long ago, and so would my company(s).

I had problems with an amp running 3-500Z tubes many years ago.

The resident expert(s) recommended a retrofit of the "Measures mods". This
was done, and I still went through two additional sets of tubes before I got
a good set. My amp has been stable now for a couple of years, and I
attribute this to the fact that I finally, through a process of elimination,
have a good set. Quality control is the biggest factor in my opinion, not
one mythical, un-provable cause. 

There may be something to this parasitics theory, but that can't be the only
thing that causes tubes to fail. Simple logic will tell you that.

You don't need to be an engineer to come to that conclusion.

Now back to your regularly scheduled arguments.

73

Gary McAdams
WG7X