On 4 Mar 2005 at 14:42, R.Measures wrote:
> Hello, Brad -- My guess is that the tube has an intermittent fil-grid
> short since neg grid-I is what typically results when such a short
> occurs.
I agree. But the problem MIGHT not be in the tube. I once
encountered an amp with exactly these symptoms, but even trying a
couple of good tubes didn't help. Eventually, I found a little
solder whisker or blob at one end of the filament choke that would
sometimes short (the filament) to the chassis. A few seconds with
the slobbering iron cured the problem completely.
Other times it most certainly WAS the tube. I'm just suggesting
another place to look.
73,
George T. Daughters, K6GT
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