Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old December 2nd 19, 10:55 PM posted to sci.electronics.repair
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Default Valve amp standby


in a previous post of mine about a faulty Engl amp I had that destroyed all its valves, I believe it was suggested by Phil Allison that Standby mode can be inmplemented in a push/pull configuration simply by removing the Screen Grid HT.

Since this grid does not pull much current, switching it off is fairly trivial, as opposed to the trauma of switching the whole HT in and out.

I posted that I had never come accross such an implementation and wondered why, but yesterday I finally did.

It is in this thing:

Interestingly, this HT switching is done by a solid state device - this one:

The switching is done via the switched speaker jack.
No speaker lead, no Screen Grid HT.


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