View Single Post
Old 3rd Nov 2021, 12:29 pm   #15
DMcMahon
Dekatron
 
DMcMahon's Avatar
 
Join Date: Apr 2019
Location: Worthing, West Sussex, UK.
Posts: 4,982
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.

David
DMcMahon is offline