Well that's very interesting but I have used my Quadra for 10 years without
any problems. I repeat, the amp has never needed any repairs and I have no
desire to replace it and I use it from 6 to 160m.
Doug
I wasn't born in Saskatchewan, but I got here as soon as I could.
-----Original Message-----
Quadras aren't bullet-proof; the RF deck seems to be rather solid but the
control circuitry is another topic entirely. I don't have the schematic at
hand, but the Quadra has an unregulated DC "sub-supply" ahead of the main
logic board to provide Yaesu transceiver-controlled power switching. This
supply uses "fuse resistors" to provide protection and drop the voltage to
the logic board, and there is a tendency for these to open in the presence
of relatively mild transients. This requires opening the amp up to the core
and replacing devices that are rapidly becoming obsolete. It takes a rather
substantial line conditioner ahead of an amp to help prevent this from
happening on a routine basis. The Quadra tuners, which I realize are not the
primary reason for buying the amp, struggles to make matches within the
advertised impedance range.
They're great amps, but hardly perfect and that's why I'm one of the people
that replaced them with Experts.
73,
Mike - N8MSA
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