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Old 15th Aug 2022, 10:13 am   #21
murphyv310
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Join Date: Sep 2006
Location: Kilmarnock, Ayrshire, UK.
Posts: 5,420
Default Re: Band 1 Rod Pentode modulator (Part 2)

Hi.
I've been asked for more details re parts. Crystals are harder these days to obtain, they are no longer manufactured in the UK unfortunately but are available from European manufacturers and China. Beware any company that can sell newly manufactured crystals and deliver in a week, these are not properly aged. Expect an ETA of at least 4 weeks.
The coil formers are 8mm OD wound with enamelled copper wire 0.5mm diameter, thinner wire can be used but it gives less Q and the tuning is flatter, adjust the video tuning for minimum sound buzz consistent with good output.
Valves are available from many ebay sellers in Russia, Eastern Europe and Ukraine, I recently got valves from Ukraine although the delivery time was long.
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Trevor.
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