ADA Preamps > MP-1 Classic

Problem with Tube Voicings on Classic

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BradS71:
Hi Guys,

I've been loving my MP1 Classic, but yesterday out of the blue it developed a weird issue. It just started make a low-level crackly, farty sound whenever I play. I fiddled around with it and discovered it only does this on the tube voicings. The solid state presets all sound fine. So I thought bad tube, right? Well, I tried 4 different sets of 12AX7's of various brands and get the exact same results with all. So it doesn't appear to the tubes themselves.

I posted a YouTube video here so you can see/hear the issue:

https://youtu.be/P5i-Hhqy7W4

Any insight/guidance would be very much appreciated.

Thanks,
Brad

MarshallJMP:
Could be R151, these go bad sometimes and then you can get this.(not always but it can). I'll take some pics tomorrow where to look for it.Do you have a multimeter?

Dante:
Hi Brad,

No worries bro, you're in good hands. MJMP answered you in less than a half hour!! whow!

I love my Classic too, and will be watching this thread to see what happens.

Dante

BradS71:
Wow. You guys are awesome. Yes, I have a multimeter. Really appreciate the help.

MarshallJMP:
Check this resistor with your multimeter, (do not turn the classic on!!) it should be 180k ohm.

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