I recently modified this little amp to see if i could make it as good as it could be and to learn some more. I have attached a schematic but i dont think some of the values are correct.
I used shellac to lacquer the weed. in hindsight i wish i had used the clear shellac on this type of tweed its not the same as on the
big amps, strangely it has a lot smaller weave and the shellac seemed absorb right in and darken too much but it still looks cool.
also the amp had two 2 inch speakers absolutely pointless and sounded terrible. So i managed to get a 6x4 inch speaker in there !!
i had to move the guts around a bit to make it fit and also remove the pots from the pcb as they were directly connected
i installed a bezel for the LED added a 12v battery holder and IC socket. I finally settled on the Vintage MC1458P opamp I had taken from a 70's
now im still a bit of a noob at this so i was looking for some advice
this amp comes with a headphone out jack strangely it is a 1/4 inch jack how can i make this into a mono cab out jack? I think
i might have idea how to do this i have attached some pics one of the pics is from a guy modding the amp into a pedal
but i think it should still apply here
on the pic where he has cut the pcb board he says this "The cut on the left stops the amped signal from reaching the stereo OUTPUT jack.
The cut on the right turns the stereo jack into mono by isolating its tip and ring contacts"
so if i removed the resistor and the capacitor then cut the trace as he sugested would this allow me to connect to a cab?
also i would like to replace the Si clipping diodes with Ge ones and arrange it to be asymmetrical clipping
i want to match the forward voltage of a typical led if possible by soldering a few diodes in series. how would i go about doing this ?
i dont like the tone pot very much its kinda weird its a B50k pot could someone suggest an alternative ?
aslo which caps would be the tone caps here i would like to mellow the tone as its a bit shrill sounding when the drive pot is up full. when drive at 0 and the volume maxed it sounds good.
drive pot is A500k and the volume is A50k
i cant tell you how much better it sounds with a 6x4 speaker in there !!! and the opamp swap made a big difference aslo.
Thanks in advance any info would be greatly appreciated
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