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DEVILLE
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MINI-TWIN
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PRINCETON 5F2-A
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SUPER CHAMP
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SUPER TWIN
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VIBRO CHAMP
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Kay
703-C
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Marshall
DSL100
• choke & o.t. install
Montgomery Ward
VALCO 62-9033
• 6973 tube substitute
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Peavey
6505+
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CLASSIC-30
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Selmer
LITTLE GIANT MK 3
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Vox
AD50VT
• power resistor
VALVETRONIX
• pot replacement
Keyboards
Akai
MPC2000XL
• bad jog wheel
Casio
PRIVIA PX-130
• broken power jack
E-Mu
VINTAGE KEYS
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Ensoniq
SQ-2
• battery change
Farfisa
MINI COMPACT
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Korg
01/W
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KARMA
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KRONOS
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M1
• worn-out buttons
POLY-61
• envelope problems
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SV-1
• removing the keybed
• removing the keys
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TRITON
• disassembly
TRITON
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X3
• floppy drive belt
X3
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KEYS & CONTACTS
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Kurzweil
PC88
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M-Audio
KEYSTATION
• broken USB jack
Moog
MICROMOOG
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MINIMOOG
• key bushings
PRODIGY
• key contact cleaning
ROGUE
• broken power jack
Roland
D-50
• key contact cleaning
JUNO-60
• battery upgrade
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JUNO-106
• 3-prong AC jack
TR-808
• cracked ribbon cable
• worn-out switches
• new battery holder
Sequential Circuits
PRO-ONE
• key contact cleaning
Vox
CONTINENTAL
• key contact cleaning
• drawbar problems
• new panel switches
Yamaha
DGX-530 / YPG-535
• no sound
MOTIF 6 & 7
• disassembly
MOTIF 6 & 7
• worn-out buttons
SY77
• battery change
KEYS & CONTACTS
• motif 6/7, w5, kx76,
• dx7, sy77/85/99 ...
Technique
• IC Sockets
• Phone Plugs

Fender Vibro Champ® View
the
Repair
Shock Prevention

 

The AC wall plugs of vintage guitar amps are non-polarized.  That is, they can connect to wall sockets in two different ways by simply rotating the plug 180°.

NEMA connectors

This can create a shock hazard for the guitarist because one side of the socket carries the hot voltage and the other side is neutral.

Polarized AC Plug

Our iFAQ on Amplifier Shocks has details on why these shocks occur, what a 'death cap' is, and what ground switches do.

Polarized AC Plug

This repair story shows how to install a polarized wall plug on a Fender® Vibro Champ® guitar amp.

A polarized plug fits a polarized socket in just one way.  A wide prong fits the neutral slot and a narrow prong fits the hot.

 


Replacing a non-polarized wall plug with a properly wired, two-prong, polarized wall plug is often all that's needed to eliminate the risk of ground shocks in vintage guitar amps.





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