How can I modify this grommes little jewel amp for guitar.

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JZatopa

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Joined 2003
zatopa.com
I have a single Grommes LJ-6 mono amp and since I have enough stereo gear I think I would like to use it as a guitar amp. I have found a review and schematics here http://www.grommesprecision.com/grommes/assets/pdf/littlejewelreview.PDF. I haven't worked on any electronics in a while so I could use a little walk through. Is there more to it then just changing one of the rca's to a 1/4" jack but I am not sure what.
 
Tom Bavis

Tom Bavis

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Joined 2002
audiophool.com
I suggest you compare the circuit to a Fender or other amp of your liking - and change the circuit to match. The preamp is equalized for RIAA phono - you want a flat response. The tone controls will have little affect in the guitar frequency range. The large amount of negative feedback will result in an abrupt transition into nasty distortion as you overdrive it. The makers of guitar amps have learned how to make good-sounding amps - take advantage of their experience.
 
J

JZatopa

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Joined 2003
zatopa.com
Looks like this has been done before.

Grommes Little Jewel conversion

Custom Designed Guitar Tube Amp

I am now debating if I should find a matching amp to make a stereo setup for some reason, sell it or make it a guitar amp.

Looking at the circuit could this design be made to sound good by today's standards without totally gutting it and redesigning it?


*edit* Can anyone confirm the pricing on this ebay post? http://cgi.ebay.com/Grommes-Precisi...emQQptZLH_DefaultDomain_0?hash=item35a3b09e58

I thought these amps sold for $20-$50 now a days.
 
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