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Silicon · 12th Jul 2022, 9:18 pm

When I opened up a 1942 military receiver I found it to be almost as it left the factory.
I was reluctant to replace any components but I wanted to see if it would work.

The heater circuit was OK and there was no serious leakage on the HT.
I used a 6V gell battery to power the heaters.

I monitored the HT current as I increased the HT voltage using a few PP3 batteries.
My Sennheiser HD420 headphones were a good match for the 600 Ohm output.

At 27V it pulled in a strong station.
At 36V it tuned across the MW band and the sound quality was good.
Since the valves were passing microamps, I figured no harm could be done in the short term.

12th Jul 2022, 9:18 pm	#13
Silicon Nonode Join Date: Jun 2007 Location: Coulsdon, London, UK. Posts: 2,171	Re: Dynatron mid 30's 'tuner' When I opened up a 1942 military receiver I found it to be almost as it left the factory. I was reluctant to replace any components but I wanted to see if it would work. The heater circuit was OK and there was no serious leakage on the HT. I used a 6V gell battery to power the heaters. I monitored the HT current as I increased the HT voltage using a few PP3 batteries. My Sennheiser HD420 headphones were a good match for the 600 Ohm output. At 27V it pulled in a strong station. At 36V it tuned across the MW band and the sound quality was good. Since the valves were passing microamps, I figured no harm could be done in the short term.