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VintageKustom.com is your source for literature and information on the tuck-and-roll vintage Kustom amps from the 60's and 70's, as well as their related products such as guitars and organs . We provide a webboard for help with kustom gear history, technical information and repairs as well as discussions with other collectors.
Home » VintageKustom.com » Repairing Kustom Amps » '69-'70 Kustom 100 2 power cord upgrade (power cord upgrade queation)
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Re: '69-'70 Kustom 100 2 power cord upgrade [message #29188 is a reply to message #29173] Sun, 26 November 2023 09:31 Go to previous messageGo to previous message
stevem is currently offline  stevem
Messages: 4752
Registered: June 2004
Location: NY
Senior Member
1) black in the old power cable that went to the fuse was hot, in your new cable Brown is hot and green / yellow is ground.

2)
If you go to this sites tech section and look at the schematic for the 803 board you will see that the output jack on the tank is grounded to the tank due to the way the rca jack itself is made.
That ground wire you posted about needs to stay.

If the tank is original this jack assembly when screwed in place grounds out to the tank, but the input jack does not do that and this is done so that a hum making ground loop is not formed.

If you use any type of new or used tank this is the way the jack configuration needs to be.
2A) on the 803 board the rca jack closest to the red wires is the jack that feeds the input jack on the tank.

2B) most reverb tanks do not work because one of the small wires at jack has busted off due to the movement of the tanks spring trough.
These can be soldered back on provided that the coil the wires feed is not open, as that is the other electronic failure point in most tanks.

2C) if these two points are ok and provided the very fine wire at each have there hooks still intact, then if you can turn up just a spring then you could get that tank back to working again.

2D)
The tank I gave you the part number for is not made to be installed the same, as in hanging upside down.
However it should still work.

If the spring trough bottoms out then the 4 support springs can be moved to different holes.

I could not find a new tank that could be mounted the stock way and yet have the right input and output impedance.

The steel tag on the rear of the amp should say .9 amps, so use a 1 1/2 amp fast blow fuse.

Note that pictures can not be up loaded to this site.

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