R-388 s/n 182
This receiver has an excellent front panel, both top and bottom covers, with the wing nuts for the top cover. Only slight marking at the rack mount holes. The KC dial is nice, no holes or scratches. The MC band drum is somewhat yellowed, not badly, some stains and a few small marks. Inside, dusty as received, no alignment tools, but has tube/filter and xtal hold-downs. The top cover has the original Allen & Bristol wrenches in their clips. All tube shields present. Has Navy anchor logo on outsides of side panels & on top front bracket. Slight pitting on outside of side panels. Has all knobs, original and shiny except some scratches on the RF gain knob. IF cans are shiny, but have ID scratched into the top of each.
When powered up it received good signals on the AMBC band, but not strong audio. Did receive on all bands. The PTO is off ~11kc from end to end.
After removal of the bottom cover it was found to be clean, and no indication of modifications or previous work.
Tubes, knobs and MC drum were removed and chassis was cleaned.
(no pix of "before" condition)
back of panel before & after (black) product detector cables added. I re-installed the panel, tested all tubes (replaced a 12AX7) & got the dials lined up (preliminarily) after putting power on it. Could hear signals on AM, but no BFO connected due to the cabling changes being started.
The PTO has been pulled & refurbed, incl. trimming the compensating coil to change the "span", which was 11kc end to end. After recalibration it's now ~ 1/2kc end to end & better than that between each 100kc point.
Underneath pix before removal of bathtub capacitors & any product detector wiring installation. Solder has been "sucked" from bathtub capacitor terminals.
sockets stripped for product detector installation & C-204
replacement. IF input filter for the prod. det. is installed, just above the "Orange
Drop". The BFO tube gets changed from a 6BA6 to a 6BE6, with
major wiring changes on the socket
One bathtub capacitor replacement bottom view after all caps replaced & most under-chassis work done.
Product Detector area, completed front & top views during alignment
outside views with covers inside of top cover
inside details AVC mods. term. strip AC line cord input Prod. Det./BFO area Prod. Det. & AVC schem.
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