>On Mon, 8 Mar 2004 08:28:38 -0800, R. Measures wrote:
>
>>? tnx. Gassy tubes usually don't blow the fuse, they draw anode-I on
>>standby.
>
>_________________________________________________________
>
>Ok, if you say so. My only experience with a known gassy tube was a
>3-500Z in a Heathkit SB-1000. I powered up the amp after it had been
>sitting for about five years. The fuse blew instantly. I connected it
>to a variac and slowly raised the line voltage. The tube started
>glowing a nice purple inside and was obviously gassy.
>
? agreed. It would have made an interesting lamp base if powered by a
neon sign xfmr.
>My AL-1200, on the other hand, developed it's problem relatively
>overnight, so gas may not be a likely culprit. I mentioned it only
>because of the possibility. More likely, something internal shorted.
? I know of another case where a 1200A7 filament shorted to the grid,
however, 0v from grid to filament would not cause a fuse to blow.
>
cheers, Bill
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