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Chindit · 11th Feb 2019, 3:11 pm

I had a one valve HAC set. It used the triode section of an army surplus AR8 (aka HL23DD). This is a 2 volt valve and the filament was powered by an Every Ready type 800 (the twin cell 3 volt bike lamp battery with the flat brass strip connectors) through a dropping resistor of around 8 ohms from memory. I bought a big Ever Ready B136 90 volt + 1.5 volt battery from Halfords to power it. I only used the HT section of course. This would be around 1974 and the battery cost me around £1.50 back then. I think the only other HT battery that was still available at this time was the smaller B126 which cost around £1.10.
Of course, seeing as the HT consumption is only a few milliamps, it would be easier to run it from 10 off PP3s daisy chained together in series and taped up. This would last for ages and would be true to the original method of powering the set.

11th Feb 2019, 3:11 pm	#5
Chindit Tetrode Join Date: Feb 2011 Location: Bishop Auckland, County Durham, UK. Posts: 97	Re: HAC Regen receiver PSU I had a one valve HAC set. It used the triode section of an army surplus AR8 (aka HL23DD). This is a 2 volt valve and the filament was powered by an Every Ready type 800 (the twin cell 3 volt bike lamp battery with the flat brass strip connectors) through a dropping resistor of around 8 ohms from memory. I bought a big Ever Ready B136 90 volt + 1.5 volt battery from Halfords to power it. I only used the HT section of course. This would be around 1974 and the battery cost me around £1.50 back then. I think the only other HT battery that was still available at this time was the smaller B126 which cost around £1.10. Of course, seeing as the HT consumption is only a few milliamps, it would be easier to run it from 10 off PP3s daisy chained together in series and taped up. This would last for ages and would be true to the original method of powering the set.