Revisiting the Revox A77 (comments over broken sound)

This Revox A77 has developed a bit of an audio quirk. And so did the stream - so this is a reupload with some comments during the broken sound bit.
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[@WestCoastDP]

You have the last of the Revox A77, the MKIV. The playback boards you have are the earlier ones from a MKI, MKII.. The MKIV had plastic transistors, yours show the metal case transistors. The all work the same, no big deal. Yes, cleaning the heads really, really good helps.