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-   -   Bogen MX-60a tune-up (http://www.diyaudio.com/forums/tubes-valves/92998-bogen-mx-60a-tune-up.html)

apehead 28th December 2006 12:28 PM

Bogen MX-60a tune-up
 
Hello,

Just had a few questions about my baby, the Bogen MX-60a. First, when I turn up the treble and the turn up the high pass filter, it begins to hiss prety loud. Also, at higher volumes it begins to pick up radio stations. The power tubes are no longer 8417's, the amp was retro-fitted for EL34's by the pevious owner. there are also 1/4" input and output jacks, and a bias adjust installed. Other than that, the schematic is accurate. Also, I would like to possibly take the TAPE/MAG input and use it as a overdrive stage for the Mic 5 input (which is the one that controls the 1/4" input). Any advice would be greatly appreciated. I also have a Bogen CHB-100 amp I would like to be made noiseless as possible too.

Thank you,

JackCHB-100

apehead 28th December 2006 12:30 PM

I'll have to post the MX-60a schematic on my myspace page when I get home... The link will follow.

apehead 8th January 2007 08:45 PM

MX-60a Schematics
 
here we go... I hope

apehead 8th January 2007 08:55 PM

MX-60a schematics

AngusL 28th December 2007 11:07 PM

Bogen MX60A
 
Thanks for making the schematic available for this old amp. Just bought/traded for one and plan to use it for my guitar. Mostly planned to drive it with my Behringer pedal but now will build some preamp stages and try it without any outboard effects.

AngusL :D


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