Showing posts with label
GM70
.
Show all posts
Showing posts with label
GM70
.
Show all posts
Saturday, 6 September 2014
Coleman Regulators Part 2 - GM70
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Rather a long time ago now I posted about Rod Coleman's filament regulators which I use for heating GM70s (and other DHTs). They...
Sunday, 15 December 2013
Coleman Regulators - GM70
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Heating of directly heated filaments is a much discussed subject. Unlike indirectly heated valves directly heated filam...
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