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So far all ten zener diodes on main pcb on diode test in one direction are between .6v and .8v and other direction 1.7v upwards, other than D17, found nearest the relay (not the regular diode half visible right next to the relay or the zener half visible and labelled D18 a bit nearer the corner...

Thanks for the compliment re. photos :) Pink stuff is likely remnant of red silastic from nearby connector. Some connectors have received tan coloured hot glue instead but being easier to remove should be less apparent than silastic. Started by diode testing pins of transistors Q1 to Q6 on...

Here are some photos of main and input PCBs front and back, let me know should these be inadequate or if more are needed before box is reassembled for further testing. MainPCBTrace by Zjho posted 23 Dec 2021 at 12:29 PM MainPCBTop by Zjho posted 23 Dec 2021 at 12:25 PM InputPCBTrace by Zjho...

PCBs

Lol, have just downgraded to a second hand flea bay older model Cambridge Audio Azur 340, well, already have another 340 so a bit biassed.

Thanks for those links, wish i could find a YT channel on repairing amps. Audio Amplifier Servicing Youtube Channel have offered free advice for temporary fixes but think this issue is beyond that. Nice to see that Audio output IC is still available and affordable.

Will test headphone jack as soon as get jack adapter for earphones. I will need to learn how main pcb relay should operate. Searching web revealed this thread on the AM10 by Treeman who briefly identifies the AFE relay pins. His blurry image of rear of pcb may enable probing without removing...

It does look a substatial overvolatage.

Great suggestions, particularly regards relays. Have changed the cable for the inputs and changed mp3 players and makes not difference. Earphones work from mp3 players. Yes my phone has a earphone jack but different mp3 players should cover that. I don't have 6mm headphones, if this is an...