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    The preamp board wired up. This is the original preamp board. The circuit was adding a simple reverb circuit that totally ruined the sound of the amp so later we bypassed and removed this part of the circuit. The third socket from the left and its associated circuitry were removed.

    The preamp board wired up. This is the original preamp board. The circuit was adding a simple reverb circuit that totally ruined the sound of the amp so later we bypassed and removed this part of the circuit. The third socket from the left and its associated circuitry were removed.

LM386 Altoids tin amp – Hack a Day

Hacker friend and cohort Dino Segovis is back again with the fifth installment in his “Hack a Week” series. This time around he has put together a 1/2 watt audio amplifier that would make for a great weekend project. He’s a big fan of the LM386 amplifier chip because it does so much in such a small package. Since it is so versatile, he used it as the centerpiece of his Altoids tin amplifier.

via LM386 Altoids tin amp – Hack a Day.

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100 Watt Custom Amplifier!

Marshall DSL 2000 gutted and rebuilt into a fiery ground shaking monster of an amplifier by Doug of Duo.Glassix. This amp combines charachteristics and circuts of a couple different well known amps. The resulting sound is that of Neal Youngs amplifier meets Zakk Wyldes amp and when the master volume is unleashed does not just thump your chest but rips your heart out and stomps on it! It has been called the meanest sounding amplifier on the face of the planet! I constructed an A/B/Y footpedal to take advantage of the parallel interactive channels (why is this feature not utilized more often). When channel 1 turned up all the way you get this sweet natural amp distortion while channel 2 if turned up 2/3rds of the way yeilds a deliciously warm woody clean jazzy sound that is to die for! The volume difference between the 2 channels is perfect for hitting that stinging solo tone while backing off the guitars volume cleans it up very nicely indeed. Some one asked for the schematics so here ya go! Enjoy!

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From Marshall DSL 2000 ripped out by the guts!

This is the rectifier and power filtering circuitry.
It is pretty standard faire.
It uses a typical bridge rectifier with a 10H choke.
There are a pair of totem pole filters and a pair of Pi filters.
Also a negative bias supply circuit.
Also a 6.3 VAC heater circuit rated at 7 amps.

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From Marshall DSL 2000 ripped out by the guts!

This is the power amplifier and phase splitter.
The output stage includes a pair of parallel speaker jacks.
There is a 4,8,16 ohm impedance selector swith.
Also a line out jack to connect straight to the board.
The Presence knob attenuates the high end sizzle.
This is a long tailed pair phase splitter.
It drives this quad of EL34’s into fire-breat​hing mode!

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From Marshall DSL 2000 ripped out by the guts!

Here is where the magic is made.
This preamp has a pair of parallel triodes.
There is a bridge switch on the cathodes.
It induces interactiv​e vvolume controls on the channels.
Next is a cathode follower tone drive stage.
It and the tone stack are the same circuit used it a JTM45.
The master volume circuit is that of a typical JCM800 2203.
These two circuits together provide for some really amazing tones.

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Marshall DSL 2000 ripped out by the guts!

BC Rich

I owned this beautiful guitar for 8 days last summer. It was a very dark sounding guitar which does not suit my ears well. It was beautiful however and had 7 laminations of different exotic tonewoods for a beautiful sustaining tone. The electronics however left a lot to be desired. Definitely a heavy thrash metal guitar!

BC Rich
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