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Gi4CZW Cliff · 13th Feb 2021, 10:32 am

Hello and I hope some-one can help. I’ve had a number of qso’s on this Tx/Rx until the bfo started to delay oscillating from mains-power-on ( as different to it’s own on/off switch ) now it’s no osc. all the time. DC Voltages don’t change osc/no-osc but Vp-p only show when working. Component values with green dot checked, R22-23 look reversed values on component listing and changing C42 no improvement. C42 is a Dubillier type 400 ( resistor looking ) with orange, black, brown bands.
I used scope with X10 probe for voltages, avo for resistors and 1KHz capacitor tester. Lovely set, component access a problem and I hope to get it going again.Cliff.

13th Feb 2021, 10:32 am	#1
Gi4CZW Cliff Pentode Join Date: May 2011 Location: Enniskillen, Fermanagh, UK. Posts: 188	MK.123 spyset BFO fault. Hello and I hope some-one can help. I’ve had a number of qso’s on this Tx/Rx until the bfo started to delay oscillating from mains-power-on ( as different to it’s own on/off switch ) now it’s no osc. all the time. DC Voltages don’t change osc/no-osc but Vp-p only show when working. Component values with green dot checked, R22-23 look reversed values on component listing and changing C42 no improvement. C42 is a Dubillier type 400 ( resistor looking ) with orange, black, brown bands. I used scope with X10 probe for voltages, avo for resistors and 1KHz capacitor tester. Lovely set, component access a problem and I hope to get it going again.Cliff. Attached Thumbnails