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Old 17th Dec 2019, 5:01 pm   #3
cathoderay57
Octode
 
Join Date: Oct 2017
Location: Bristol, UK.
Posts: 1,206
Default Re: Marconiphone 538

Re: higher than expected HT voltages, reading the Trader sheet again it says the voltage test results were taken with a mains voltage of 228v AC on the 224-255v mains transformer tapping. My mains is about 235v AC and there isn't a higher tapping to select. Also, doing some basic calcs shows the anode current of V2 is spot-on (3.4mA) and that of V4 very close (4.6mA vs 4.5mA). So I reckon unless I fit a stonkingly high wattage dropper resistor into the HT line I am stuck with the high voltages. Any comments welcome.
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