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Vintage Marantz
7 Preamplifier
This customer came in with a
functioning 1959 Marantz 7 Preamplifier. He was
told by his friends that "the Marantz 7 would perform
well only if major components are upgraded, such as
capacitors, resistors and attenuators".
We performed a bench test on
the unit and found very few components which needed to
be replaced (4 resistors, and 2 capacitors). We also
performed the following test:
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L/R Balance check
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Amplifier noise and hum
check
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Line output distortion
check
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RCA and Tube sockets,
integrity and oxidation check
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Power capacitor leakage
check
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Phono stage noise and
distortion check
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RIAA check
The unit was bench tested
again to ensure all factory specifications were met.
We advised the customer not
to proceed with the optional "exotic" upgrades, which in
our opinion were unnecessary. He welcomed and
accepted our advice.
Total Cost of Upgrade: $ 80
dollars including parts
Turnaround Time: 2 hours,
repaired on spot.
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