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K100-2 reverb and treble boost mods [message #18813]

Sat, 01 June 2013 03:21

bozole
Messages: 3
Registered: May 2013
Location: Paris (France)

Junior Member

Hi

I posted on another topic this mods, and I think it should be easier to make it visible in a new topic, so here it is

Here is what you need to do for modding K100-2 amps, converting the unique channel (which is equivalent to the bright channel in the K100-1) to the K100-1 normal channel, and keeping the reverb feature :

You just have to remove from the board 4 components : R127, C116, C117, C118 (you'll find a picture from the portion of the schematic here : http://vintageamps.free.fr/K100-2mod.jpg)

In complement, another mod interesting if you want to have a reverb with a much less pronounced intensity : increase the size of R170. For me, 120K works really fine, try different values to find the best one for you Wink

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Re: K100-2 reverb and treble boost mods [message #18814 is a reply to message #18813]

Sat, 01 June 2013 07:22

stevem
Messages: 4733
Registered: June 2004
Location: NY

Senior Member

Hello, and thanks for coming on board and posting + sharing this info!
In regards to the tone of the reverb, I find that with some guitars I like to roll off some more of the bottom from the reverb, and to do this I change out C126. Swapping it out from its 10 mfd value to 5 mfd.
My need to do this in certain amps( not only Kustoms) seems to be a function of how well the pan is made, and not just new replacement pan`s!
If the Transducers(little transformers that the wires go to)at each end of the pan are a bit loose on their iron core(which most are to some degree) the pan will lack highs and flowing thin super glue down into the core passage and then setting with fast set spray makes for a pleasing tone improvement.

Also many times with the age of these amps we are dealing with these electrolytic coupling caps of which many are used through out these amps drift and change value. The drifting can shift the caps value up or down, and if it happens to go up the amp will have more bass than intended.
This extra low end can make the reverb sound muddy and bongy while in other sections of the amp can make for alot more bass than needed to be on hand. In a situation like this if the amp is played loud enough this extra bass will make the low end fart out as the power supply voltage gets pulled down and the amp clips hard.
The reverb having a tone control like on the slant metal face amps is one of the many reasons I like them so much for guitar work.

[Updated on: Sat, 01 June 2013 07:31]

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