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Old 20th October 2019, 07:43 AM
snowman_al snowman_al is offline
Join Date: Nov 2016
Location: West Wales
Posts: 71
Default Re: KEL84 from the recycling centre

The extra voltage on the ECF80s is 'normal' but not necessarily desired.
You must test it with all the valves in though, to get a true reading.
That way the transformer is loaded correctly and you are not measuring just the 'peak' DC voltage. It won't hurt the ECF80s for a few minutes.

Once you know the actual working DC voltage you can work out a resistor to get it between 6 and 6.6 volts. (Assume 2 x ECF80 consume 0.9A) Most people have ended up with a 1 ohm 3 or 5 watt job.
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