[Amps] Running 3-500s upside down

[Pete Smith]

I understand that running 3-500s on their side risks internal shorts.  I 
need to do some trouble-shooting on my modified SB-220's relay/bias 
switching circuit, however, which would be much facilitated if I could key 
but not drive the amp (no RF out) with it upside down.  I can pull the 
tubes if I need to, of course, but would prefer not to.

73, Pete N4ZR
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