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K-250 amp [message #22955]

Fri, 22 May 2015 16:14

Iowa Boy
Messages: 767
Registered: June 2014

Senior Member

Hey guys I need some advice on a 250 that has all the effects on it for guitar. The fuzz effect does not work and channel 2 is totally dead. The guy is asking $200 for it and does not have the foot pedal. I was wondering if this is something worth maybe buying and repairing or should I just walk away from it? Was thinking maybe it might be something as simple as the Molex plug with a bad connection. Any thoughts?

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Re: K-250 amp [message #22956 is a reply to message #22955]

Fri, 22 May 2015 16:45

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

If it has fuzz, then it's probably a K250-4. The fuzz only works on the 2nd channel, so if channel 2 is dead, the fuzz is dead as well.

It probably is just a dirty connector. Worse case a bad chip.

What color and what condition is the T&R?

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Re: K-250 amp [message #22957 is a reply to message #22956]

Fri, 22 May 2015 22:53

Iowa Boy
Messages: 767
Registered: June 2014

Senior Member

It's blue and in fair condition. How hard would it be to build a footswitch for this since I have never seen one the market in the past year?

Thought if I got it that there is also a 4 X 12 cabinet in the area as well in blue and maybe eventually I could pick up another somewhere. Would make a nice guitar setup for someone and wouldn't break the bank.

[Updated on: Fri, 22 May 2015 23:00]

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Re: K-250 amp [message #22958 is a reply to message #22955]

Sat, 23 May 2015 06:19

stevem
Messages: 4730
Registered: June 2004
Location: NY

Senior Member

It's not hard to build a foot switch even if you want to have indicator LED in it like a factory one, but if you do not mind one with out the LEDs tha Antique electronics has many different types of them and all you need to do is cut of and swap the end to what you need for a connector .
I think they even carry a aluminum cased one that would be like the original pretty much!

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Re: K-250 amp [message #22959 is a reply to message #22958]

Sat, 23 May 2015 07:00

Iowa Boy
Messages: 767
Registered: June 2014

Senior Member

So what voltage of lights would it use? Thanks for the info Stevem.......if I decide to buy it, I think the lights would be a nice effect.

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Re: K-250 amp [message #22960 is a reply to message #22959]

Sat, 23 May 2015 08:47

pleat
Messages: 1452
Registered: June 2004
Location: Belding, Mi

Senior Member

The lighted footswitches used the same 335 bulb. Schematic shows 12V power and 330 ohm to ground. Also a 1N5359AA diode to ground from the +12V.

Depending on the age of the K250-4 amp, it may be a newer chassis that used the two seperate 1/4" stereo footswitch jacks rather than the older model that has the 6 pin XLR footswitch jack.
pleat

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Re: K-250 amp [message #22961 is a reply to message #22955]

Sat, 23 May 2015 10:53

Iowa Boy
Messages: 767
Registered: June 2014

Senior Member

I thought the 335 lamps were 28 volts......but your saying its 12 volts to the footswitch? Why not just use 12 volt LED light then? Keeping things original isn't me you already know that. I'm for functional and improvements.

[Updated on: Sat, 23 May 2015 10:56]

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Re: K-250 amp [message #22962 is a reply to message #22955]

Sat, 23 May 2015 11:08

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

The 335 lamps are 28 volts, and that's what the original footswitches used. If you want to use leds go ahead. Pleat was just telling you what the original design used.

The original switches were large cast aluminum things, that were about the size of a modern multi-effect box. Maybe 18-20 inches wide. Each section had a hinged activator panel, kinda like a Boss pedal, that pushed the actual mechanical switch underneath it. Above the actuator panel was a backlit name panel that would light up when the effect was turned on. If you search the web, you will probably find a photo somewhere that will make it easier to understand.

Additionally there was a wah pedal that plugged in to control the Selective Boost circuit.

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Re: K-250 amp [message #22963 is a reply to message #22955]

Sat, 23 May 2015 11:32

Iowa Boy
Messages: 767
Registered: June 2014

Senior Member

Have you ever seen one of these up for sale? I saw the one in the literature section and it does look very cool but doubt that I will ever find one.

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Re: K-250 amp [message #22964 is a reply to message #22955]

Sun, 24 May 2015 00:47

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

They come up on eBay every now and then. I think last year there was one 4 switch unit and a couple of 2 switch units.

Because they are so unusual they get pretty pricey.

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Re: K-250 amp [message #22965 is a reply to message #22955]

Sun, 24 May 2015 06:10

stevem
Messages: 4730
Registered: June 2004
Location: NY

Senior Member

If you choose to built it with LEDs you need to use a current limit resistor in series so that it does not burn out!
Go on line and do a search for the details and how to do the simple math.

[Updated on: Sun, 24 May 2015 06:16]

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Re: K-250 amp [message #22966 is a reply to message #22965]

Sun, 24 May 2015 12:06

Iowa Boy
Messages: 767
Registered: June 2014

Senior Member

Think I will just pay you to build it for me.....least then I know it would be done right. What about the wah wah pedal? Could just a regular pedal be used or is something else required instead?

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Re: K-250 amp [message #22967 is a reply to message #22966]

Sun, 24 May 2015 13:49

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

If you search on the board here, there was a guy that was making wah pedals from volume pedals. You can make your own, you just need a pedal with the correct pot and a three wire stereo 1/4" cable.

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