simple question,
sometime for one reason or other a new power tube shortly red plate ,
fos 60/120''
then you find the problem, the tube still work perfect or sometime few more or less current than new
this tube go have shorted life, sure, but can still be employed or you discard???
i means the tube still measure good, its like new, but get short red plate.
dust bin or let him work ???
my opinion its to let this tube finish its short life
waths yours opinion???
sometime for one reason or other a new power tube shortly red plate ,
fos 60/120''
then you find the problem, the tube still work perfect or sometime few more or less current than new
this tube go have shorted life, sure, but can still be employed or you discard???
i means the tube still measure good, its like new, but get short red plate.
dust bin or let him work ???
my opinion its to let this tube finish its short life
waths yours opinion???
Over heating the anode is not too much of an issue as long as not for a prolonged time as damage can occur to the screen grid and the elements may bend causing damage. When the anode 'red plates' the anode stops attracting electrons and and will try to emit electrons back to the cathode so the power output is reduced.
Many years ago, I built a power amplifier using 813 type valves. They had carbon anodes and being carbon do not emit electrons and one can over drive the valves without too much problem until the glass melted and imploded!
Many years ago, I built a power amplifier using 813 type valves. They had carbon anodes and being carbon do not emit electrons and one can over drive the valves without too much problem until the glass melted and imploded!
I built an 80 watt valve amp.
I didn't realise straight away but one of the output valves was red plating.
It was a stupid mistake I had forgotten to fit a grid stopper and the valve was fully on all the time.
I fitted the resistor and the amp was fine after that.
I would just go with the same tube and see how it goes.
I didn't realise straight away but one of the output valves was red plating.
It was a stupid mistake I had forgotten to fit a grid stopper and the valve was fully on all the time.
I fitted the resistor and the amp was fine after that.
I would just go with the same tube and see how it goes.
to die=mourir,yes can go bad, low emission or sometime screen short/open any time if pushed again harder
difficult to now wat to do, thats way i ask your experience and feeling
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