[AMPS] SB-220 meter shunt R failure

[nospam4me@juno.com]

Yes, I have been using "protection diodes" in my amplifier circuits 
for years. The same locations as described on Rich's site.  Over 
the years, the physical location has moved around a little, but the 
end result is an equivalent circuit. 
skipp

>Skipp wrote:
>A tube inside an SB-220 I rebuilt 3 months ago suffered 
>a grid to cathode short. I heard a loud bang and found the 
>meter shunt resistor blew apart and the grid fuse resistors 
>way out of spec. The amp has all the upgrades in place... 

:Including the diodes (as on Rich's web site)?
:73 from Ian G3SEK     
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