David's Vibroclone In Progress Page
05/28/02
This Vibroclone project is going to use a '69 BMR chassis.
Unfortunately this chassis has been seriously hacked up someone else. Amp was
hacked into a high gain distortion amp with a master volume. My first milestone
will be to just about strip the fiber board clean and then build it up from
scratch. Someone else already replaced the power supply electrolytic caps and
did a fine job. Someone else also already fitted the amp with a New Sensor
(Schumacher) multi-tap Bassman output transformer. Besides basic restoration and
Vibroclone conversion, David needs a Vibroclone faceplate and will keep the
chassis in the original BMR head cabinet for easy traveling.
Initial Condition
Another really smoky chassis in need of a
good cleaning. New electrolytic caps.
Hacked output section, normal and vibrato channels and tremolo removed, etc.
Restoration and Conversion Progress
Stripped fiber board. Cleaned back panel and new on/off and standby switches.
Cleaned chassis. Vibroclone faceplate, new knobs, intensity, speed pots and
bright switches.
Completely re-wired fiberboard following the blackface topology.
Fiberboard again. New output socket heater wire, AC cord and sole control.
Alive on the bench in test.
Completed Restoration
Completed chassis pics.
David sent me these pics of his Vibroclone "piggy back" and a couple
of cool axes. Nice!
What's left to do:
completely clean chassis
strip fiber board of hacks
rebuild normal channel
rebuild vibrato channel and stage coupling to vibroclone
spec's.
rebuild tremolo
partial cap job (cathode and bias only)
rebuild and blue print output section to blackface topology
replace grid and screen resistors
install new standby and on/off switches
install new power cord
install new output octal sockets and heater wire run
clean and tighten tube sockets
sole control mod
install vibroclone faceplate, new knobs, lube pots and input
jacks
replace vibrato volume pot and bias pot
install new tubes, dc/ac test and burn in
final test and voicing
ship amp back