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Sideband · 11th Apr 2019, 8:40 am

The arrow on your diagram is pointing to a filter capacitor in a voltage doubler circuit. The voltage doubler is in turn supplying 272V DC to the rest of the set.

The filaments (heaters) of the valves (6AL5, 6CG7, 6BC8) and the pilot lamp (PL 1) are being fed from a separate AC supply as normal.

11th Apr 2019, 8:40 am	#4
Sideband Dekatron Join Date: Oct 2003 Location: Croydon, Surrey, UK. Posts: 7,580	Re: Dc filament / capacitor The arrow on your diagram is pointing to a filter capacitor in a voltage doubler circuit. The voltage doubler is in turn supplying 272V DC to the rest of the set. The filaments (heaters) of the valves (6AL5, 6CG7, 6BC8) and the pilot lamp (PL 1) are being fed from a separate AC supply as normal. __________________ There are lots of brilliant keyboard players and then there is Rick Wakeman.....