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Old 2nd Mar 2016, 9:44 pm   #89
ms660
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Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
Default Re: HMV 653 Broadcaster all wave.

Yes, if replacing that cable it needs to be screened cable, I'll have a Google
for some when I have time.

R3 & R7 supply the LO (local oscillator) anode via R4 and L11, the LO anode is actually a grid that functions as an anode, so far as I can see that's all R3 & R7 supply, LO anode current given in the Trader sheet is 4ma, you can work out the power dissipated by squaring the current then multiply by the value of R3, ditto for R7, ditto for R4, choose resistor wattage rating accordingly, I normally go 2x.

This post might or might not cross.

Lawrence
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