Sander deWaal wrote:

(Bruce J. Richman) said:

You must be considerably younger than I am. I've seen lots of them;
designed lots of them. Flip-flops and other logic components were
among the first things to be replaced by transistors. What a relief!!

Of course, transistors and other solid state components never fail, right?


To be honest, transistors almost never fail in switching circuits.
They have near infinite life, as opposed to tubes.


I've had transistors and other parts fail (resistors, capacitors) in various
pieces of solid state equipment that I've owned. Of course, not being an
electronics engineero or repairman, I had to take the equipment to a service
center for an appropriate diagnosis.




At least when a tube goes bad, it's generally user-replaceable by most
owners.
This is definitely not the case with transistors and/or other solid state
parts.

It is to me :-)



The average person owning such equipment, however, has neither the expertise or
equipment (e.g. voltmeter, oscilloscope, etc.) to determine why a particular
circuit malfunctions and/or what parts might need replacement. When a tube
fails, it's pretty obvious and easy to replace by the average user.






--
Sander de Waal
" SOA of a KT88? Sufficient. "








Bruce J. Richman