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Old March 7th 19, 06:47 AM posted to
Phil Allison[_3_] Phil Allison[_3_] is offline
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First recorded activity by DIYBanter: Aug 2014
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Default Engl valve amp disaster


the standby switch opening the cathode path to ground makes me nervous.

Maybe the switch arcs when it opens.

I'd find a different way to put the amp in standby or at least put
a snubber cap across the switch.

Maybe wire a switch in series with R74 and let the negative grid bias
go way up to cut the tubes off.

** A switch in the supply to the output tube's screens works well - assuming beam tubes or power pentodes are in use.

Only a few mA need be switched at idle and no electros to discharge.

...... Phil