I haven't had any problems with electrolytics on my machines but then they've been in reasonably regular use (switched on at least once every couple of months) for their whole lives.
However, if it is a fault with a channel card it might be worth removing them one at a time to see if the fault goes away when a particular card is removed. Always switch the machine off when removing or replacing these cards.
However, before you remove anything I'd check the power supply voltages on the backplane with a voltmeter.
Quote:
Originally Posted by Barks67
I can only think at this stage that as the head has worn and signals got weaker as a result, somebody has maybe cranked the outputs on the cards and this may be causing this?
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That's very unlikely - normal signals don't really get weaker with head wear although high frequencies may reduce and head to tape contact is worse.