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Selectone PCB [message #7802]

Thu, 26 October 2006 16:51

RobbieNuke
Messages: 66
Registered: October 2006
Location: Baltimore

Member

I have the K200B-3 amp with the Normal (left) channel and the Harmonic Clipper/Selective Boost (right) channel. Is it an easy swap to replace the Normal PCB with a Selectone PCB? If so, is there a source for of these boards (NOS, used/rebuilt, boutique aftermarket)?

I tried a 250 series amp that had Selectone in one channel, and I found it to be a very nice tone shaper for bass. However, the K200B-6 heads seem very rare.

I kinda like the Clipper/Boost features for special FX (nice fuzz bass tone; I split my bass signal into the FX and the Normal channel to keep the bottom sounding full), but would like to add (Selectone) to the overall sound instead of trading off amps (Selectone instead of Clipper/Boost).

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Re: Selectone PCB [message #7805 is a reply to message #7802]

Fri, 27 October 2006 07:06

stevem
Messages: 4745
Registered: June 2004
Location: NY

Senior Member

Hi, installing a clipper board into the left side is pretty much a drop in, the only thing you have to do is extend the foot switch jack leads due to the fact that now a control pot will have to come thru that hole and the jack will have to go into the lower hole next to the input jack vacted by the control.
The impossible part will be getting a board, you will be looking at having to pick up another amp to get the board.
I would say that you will have more flexibilty end end up keeping more money in your pocket if you get MXR 11 band EQ pedal and using that in your current left channel to get even more tonal range than the Kustom selectone can provide.

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Re: Selectone PCB [message #7807 is a reply to message #7805]

Fri, 27 October 2006 09:09

RobbieNuke
Messages: 66
Registered: October 2006
Location: Baltimore

Member

My K200B-3 amp already has the Clipper/Boost circuit so I don't need to reconfigure anything for that aspect. My question was concerning the swap-out of the Normal PCB for a Selectone PCB. I guess I can always refer to my Kustom schematics to verify if there are any connecting issues. But the Normal and Selectone PCB's seem so physically and electrically similar it should be a simple swap.

I agree for the money a graphic EQ would get me the same results, but I just like the idea of the 3-position Selectone switch with pre-set EQ points. Sorta like the toroidal mid-range selector circuit in the Ampeg SVT.

[Updated on: Fri, 27 October 2006 09:11]

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Re: Selectone PCB [message #7816 is a reply to message #7802]

Mon, 30 October 2006 07:37

stevem
Messages: 4745
Registered: June 2004
Location: NY

Senior Member

Sorry I mis-understood you.If you mean to install the selctone tone channel from a k150 or k250 into the 200, than no that is not by any means simple, it would be better to mod the normal channels circuit by doing something like removing one of the input jacks for that channel, installing a dual gang 3 postion rotory switch and modding the tone circuit to emulate the selctone variatons in the 250 head, Still quite an undertaking!

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Re: Selectone PCB [message #7819 is a reply to message #7816]

Mon, 30 October 2006 09:23

RobbieNuke
Messages: 66
Registered: October 2006
Location: Baltimore

Member

Yeah, you misunderstood me again! I'm looking to put a Selectone PCB from the k200b-6 amp (the vertical front black plexi series where the Selectone PCB is placed in the left channel location looking from the front of the amp) into a K200B-3 amp(also a vertical front black plexi panel) where the Normal pre-amp PCB is located (also the left channel looking from the front of the amp).

This would leave my right channel (Clipper/Selective Boost) untouched and functional and hopefully give me a more flexible bass amp yet retain a stock look (but instead of the ON/OFF bright switch I would have a 3-position Selectone in the left channel).

My only reference to the slanted metal face 250 series amp was that was where I first ever tried out the Selectone circuit, which I took a liking to it's sound. Since then I've done some research on this site and found that the Selectone was first offered in the vertical plexi front 200 series as a K200B-6 (a rather hard to come by model it seems) just prior to the introduction to the slant-face 150/250/500 series where Selectone was available on ALL amps as standard.

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Re: Selectone PCB [message #7828 is a reply to message #7819]

Wed, 01 November 2006 20:33

C4ster
Messages: 686
Registered: June 2001
Location: Mukwonago, WI (Milwaukee...

Senior Member

Since I have been kollecting these beasts, I have only seen 1. I should have picked it up but I'm into K100's. Sooner or later when I have all the colors of the K100's I might start collecting K200's. I know where there is a K200-B4 out of its T&R, naked if you will. But the A4 is a much better find. I know what you are trying to do. To me, the fewer pedals the better. I love the sound of a pure, clean Kustom. Nothing better in my not so humble opinion.
Conrad

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Re: Selectone PCB [message #7829 is a reply to message #7828]

Wed, 01 November 2006 20:34

C4ster
Messages: 686
Registered: June 2001
Location: Mukwonago, WI (Milwaukee...

Senior Member

P.S. You still need the faceplate though.

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Re: Selectone PCB [message #7830 is a reply to message #7829]

Thu, 02 November 2006 05:17

RobbieNuke
Messages: 66
Registered: October 2006
Location: Baltimore

Member

I'll use the stock faceplate labeled and use "Bright...ON/OFF" 2-position control location for the Selectone 3-position rotary. I may fabricate some peel & stick labels to indicate the Selectone settings that will not be permanent and will retain the ability to return to original. I need to use the stock faceplate since I will retain the stock Clipper/Boost PCB in the right channel.

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Re: Selectone PCB [message #7832 is a reply to message #7830]

Thu, 02 November 2006 11:06

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

Robbie:
Just a thought here. I've never seen one of the 200B's with Selectone, so I don't know if they sound the same as the metal front versions. Technically, the metal fronts use an op-amp IC pre-amp design, while the 200B's use discrete transistor circuits. Does anyone out there know if the Selectone circuits are the same?

Maybe one of the guys here that have access to both can let us know if they sound the same.

Bill

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Re: Selectone PCB [message #7838 is a reply to message #7832]

Thu, 02 November 2006 22:39

RobbieNuke
Messages: 66
Registered: October 2006
Location: Baltimore

Member

I guess it's easy to argue that any two of the same anything could sound different in comparing the IC preamp vs. discrete transistors. I am not looking for the "purity" in sonic observance here, just a stock "looking" (3-way) variable tone preset with easily discernable shelving of sounds!

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