Marantz 7C Vintage Stereo Tube Preamp

Description

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I am offering the
vintage
Marantz 7 preamplifier
S/N 7-21059
without
walnut cabinet displayed in the photo. This is a
working
device; however, many electrical components including
- the power supply electrolytic capacitors, HV selenium rectifier, and intermittent Volume control potentiometer -
are
original,
hence this device is offered for
parts &
restoration.
It is evident that the
original
filament supply selenium rectifier was replaced; also note that a resistor network was added
either back in 1982 or 1987
above the terminal strip presumably to accommodate the previous
replacement
silicon bridge rectifier
- see photos.
The same shop technician replaced several "Bumble Bee" AC coupling capacitors with the orange mylar types, and
four
electrolytic cathode bypass capacitors were replaced as well
- see photos.
Besides these components, most others appear to be
original
including the power supply capacitors and the HV selenium rectifier
- see photos.
This preamp is specified for
117V
operation. This preamp was tested at slightly
reduced
voltage and both power supplies look to be
OK
. Five of the six preamp tubes are
Telefunken
; the other (V2) is an
Amperex Bugle-Boy (Holland)
-
see photo
. All tubes test at least above nominally good and are presumed to be the original complement for this device
- see photo
.
The exterior is not perfect; however, is in relatively nice cosmetic condition - i.e., the soft metal front panel does not display any seriously deep scratches, dents or dings from mishandling
- see photos.
The preamplifier does have some interior dust and grime, however, I've opted
not
to clean the device and
risk smearing the lettering on
the tubes - or, leaving any residue on the interior board, wiring and components.
I have never used Deoxit on the controls for this device as well. Detailed photos of the interior including views of the previous repairs are provided for your inspection
- see photo
.
Even with the problematic Volume control, vinyl LP records played through this preamp last sounded
wonderful.
Interested buyers familiar with this device are invited to bring their own test instruments and inspect the device for themselves; hence, local pickup is available and preferred.
Again, this device is offered without its walnut cabinet and as described in this listing.
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