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Re: Restoring K250-4 [message #17595 is a reply to message #17587]

Tue, 23 October 2012 00:42

chicagobill
Messages: 2005
Registered: April 2003

Senior Member

A one man band! Cool, but you should be playing a Guitorgan.

I did find my schematic copy, but I will need to scan it. The diode is a Zener type which reduces the 40 volt power supply line to 24 volts.

The 330 ohm resistors are in series with the bulbs to reduce the brightness when the effect is off. When the effect is turned on, the resistor is shunted by the switch and the bulb turns on with full brightness. The original switch had rear lighted names of the effects that needed the light turned on so that you could read the names. So the dimmed light let you see the names when the effect was off and would light up brighter when the effect was turned on.

I would probably use leds with dropping resistors rather than the light bulbs and just eliminate the Zener diode. The leds will last longer and will be easier to wire up.

Pleat, check your records I think that you have the in and out resistances for thr slant fronts reversed. Accutronics never made a tank with an output coil that was that low in resistance. They will usually read somewhere around 200 ohms dc.

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[Message index]

		Restoring K250-4 By: fullblare on Mon, 22 October 2012 14:19
		Re: Restoring K250-4 By: chicagobill on Mon, 22 October 2012 16:38
		Re: Restoring K250-4 By: Kustom_Bart on Mon, 22 October 2012 16:50
		Re: Restoring K250-4 By: pleat on Mon, 22 October 2012 19:20
		Re: Restoring K250-4 By: fullblare on Mon, 22 October 2012 23:52
		Re: Restoring K250-4 By: chicagobill on Tue, 23 October 2012 00:42
		Re: Restoring K250-4 By: pleat on Tue, 23 October 2012 07:30
		Re: Restoring K250-4 By: chicagobill on Tue, 23 October 2012 15:43
		Re: Restoring K250-4 By: fullblare on Tue, 23 October 2012 18:07
		Re: Restoring K250-4 By: Kustom_Bart on Tue, 23 October 2012 18:52
		Re: Restoring K250-4 schematics By: gopher7 on Sat, 03 November 2018 16:20
		Re: Restoring K250-4 By: stevem on Mon, 05 November 2018 05:56
		Re: Restoring K250-4 By: chicagobill on Mon, 05 November 2018 13:18

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