That is right thanks Bas, very kind of you. Well good news, i solved the problem, i swapped the D201 (small 6 pin chip) over to the other channel and the error followed, Just as well I had some flux and solder braid, as its very easy to solder the pins together. now to try and find a replacement somewhere, if anyone has any idea's (maybe two transistors would do the same, I presume they would have to match fairly well). Also found the issue with the marantz amp, power switch was not latching / staying on, and in between fixed a nice quad 405, pre-amp 34 they do really sound nice. And an old leak super 30 + so a successful week all in all. Thanks again everyone for your support and patients with this.
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So it was a bum input transistor after all. 2SA1240 is a dual transistor in a peculiar DIP-6 case (basically 2x ECB). I would make sure I buy one of these from a reputable source, they seem expensive enough for counterfeits to be an option and they are all over Chinese sources. A visual comparison with the original and quick check with the multimeter is advised.
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