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Old 27th Oct 2020, 6:15 pm   #37
crackle
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Join Date: Mar 2011
Location: Basildon, Essex, UK.
Posts: 4,100
Default Re: Adding a selectable line input to valve radiogram

Quote:
Originally Posted by Richardgr View Post

If you wired the radiogram for 3 wires, create a chassis ground, then only supply the primary of the power transformer from the mains, breaking the connection of the neutral from the chassis, and take a amplifier ground from the last smoothing capacitor, then it would be no more treacherous than any other vintage tube amp.
The secondary mains transformer T3 is only supplying heater current. The HT is derived from the mains side of the transformer.
So I don't think that suggestion is going to work.
Mike
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