I have got a Matsui TV (link:
It could be a loose ferrite core in the line O/P transformer or possibly the line driver transformer, the PSU chopper transformer can also be a suspect.
Opinions vary on what to use but I've found superglue usually does the trick - or if "a while back" means so recent there's still a warranty, take it back and complain.
a ringing transformer with a lose or cracked ferite core or bad cap in EHT circuit
(link:
quite common. not usually a fault. often a blob of superglue on the coil cores near the line stage stops the singing! or a gentle tap on the case of the set.
-B
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