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Chris Parry · 24th Dec 2011, 12:38 pm

Pin 7 should indeed have a grid leak resistor to ground. Value 22k sounds suitable. There is one other significant design or drawing error. The 8uF HT decoupler will not reliably decouple to 100kHz I frequency. Therefore it should be shunted by 100nF. Otherwise, the circuit appears sensible. Chris.

24th Dec 2011, 12:38 pm	#2
Chris Parry Retired Dormant Member Join Date: Jun 2011 Location: Waterlooville, Hampshire, UK. Posts: 237	Re: VMARS RA17 product detector modification Pin 7 should indeed have a grid leak resistor to ground. Value 22k sounds suitable. There is one other significant design or drawing error. The 8uF HT decoupler will not reliably decouple to 100kHz I frequency. Therefore it should be shunted by 100nF. Otherwise, the circuit appears sensible. Chris.