Variax 500 - Bad Tone Pot repair

Started by Elantric, January 29, 2015, 12:55:54 PM

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Elantric

Variax 500 - Bad Tone Pot repair

Symptoms:
After the first 30 seconds after power up, you hear the sound of the Variax become very dark, like the Tone pot is set to "0"
If you roll the tone knob down to 0, then back up to ~8-10, it will sound bright again, only to slowly revert to Dark Tone pot is set to "0" sound after a minute

Repair: Replace C106 on the bottom of the DSP PCB





Here is the location for C106 (.047uF  Tone Cap) on the PCB (Bottom)

Its a CAP CER .047UF 50V  X7R 0603 SMD
Yageo#CC0603KRX7R8BB473

http://www.digikey.com/product-detail/en/CC0603KRX7R8BB473/311-1373-6-ND/2103203





mbenigni

Man it is great to see someone else acknowledge this mysterious problem after all these years. Hooray for VGuitar forums!  Thanks, Steve!