I've been curious about transformer covers for some time. In the M-500 days, the field coils had covers which were dispensed with on the M-500ts (except for some very early ones, one which I worked on).
Are the covers just decorative or do they shield EMI? In other words, is the composition of the cover important to the functioning of the amplifier?
It should sound like it isn't there!
There is a difference between hearing and listening...
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Carver: C-4000 & C-1 preamps, PSC-60 preamp/tuner, TX-11a tuner, M-400 (2), C-500, M-500, M-500t, M-500t Mk.II, A-500x, AL-III loudspeakers (2 pr.)
Sunfire:Theater Grand III processor, Ultimate Receiver, Cinema Grand Signature 400 ~ seven, True Subwoofer Mk. II, D-10 Subwoofer