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Old 3rd Nov 2021, 12:29 pm   #15
DMcMahon's Avatar
Join Date: Apr 2019
Location: Worthing, West Sussex, UK.
Posts: 4,985
Default Re: Grundig TK27 - Low audio output

The black transformer wire also takes one side of the mains to the bottom of the lower primary winding, the secondary of which provides the H1 filament heater supply for some of the valves, so presumably the valves effected will not have the full heater voltage.

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