Rd112 fifty sounds bad

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Rd112 fifty sounds bad

Music Man Amps Discussion Forum » Repair Stories from the Field » Rd112 fifty sounds bad

Author Message
 Anders Tegelberg (dodger)
Username: dodger
Registered: 11-2011
Posted on Saturday, March 16, 2013 - 01:54 am:   

My RD112 get a distorted sound as soon as I turn up the volume from zero. Both on the clean and distorted channel.
There is no way that i can get a clean sound out of it.
The tubes are new and the caps has been replaced but that made no difference.
 Mike Kaus (mm210)
Username: mm210
Registered: 05-2006
Posted on Saturday, March 16, 2013 - 07:46 am:   

If you have an effect in, try running a signal in there and see if it comes out clean. That should tell us if it's in the preamp or the finals.
 Lars Verholt (lmv)
Username: lmv
Registered: 11-2009
Posted on Saturday, March 16, 2013 - 11:14 am:   

If I may elaborate: Since we're dealing with an RD-50 amp, the effect in is an RCA jack for the reverb. If memory serves, it's the one closest to the speaker baffle. If you have an adapter, sending a signal through that input (even plugging in a guitar would work) could shed some light over your distortion issue. The clean and O/D channel share a common input stage but the reverb return does not pass through there.
If your output stage is distorting you could be experiencing bad cross-over distortion, which is not uncommon in those amps.
Cheers,
Lars Verholt