UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

DMcMahon · 24th Feb 2020, 9:58 pm

I have always wondered why on some of the old R2Rs there are separate heater supply windings, you may be right about minimising interactions between the different valves.

Early on in the posts there was discussion about the humdinger pot or lack of it in the case of the TK 819.

Yes it is interesting how practices change over the years, also interesting the varying different designs over the various makes/models around same time periods.

Yes I found the TK 819 central/common earthing point (actually called CEP on some of the larger industrial equipment I have worked on) somewhat unusual for R2Rs.

24th Feb 2020, 9:58 pm	#192
DMcMahon Dekatron Join Date: Apr 2019 Location: Worthing, West Sussex, UK. Posts: 6,603	Re: Grundig TK 819 Any Useful Info I have always wondered why on some of the old R2Rs there are separate heater supply windings, you may be right about minimising interactions between the different valves. Early on in the posts there was discussion about the humdinger pot or lack of it in the case of the TK 819. Yes it is interesting how practices change over the years, also interesting the varying different designs over the various makes/models around same time periods. Yes I found the TK 819 central/common earthing point (actually called CEP on some of the larger industrial equipment I have worked on) somewhat unusual for R2Rs.