Author Topic: Echoplex Preamp: analysis y mods.  (Read 16209 times)

bms19

Re: Echoplex Preamp: analysis y mods.
« Reply #20 on: June 21, 2022, 01:19:28 PM »
would J111 Jfet work?

antonis

Re: Echoplex Preamp: analysis y mods.
« Reply #21 on: June 21, 2022, 03:23:58 PM »
Sure..
(but with lower Drain & Source resistor values values..)
"I'm getting older while being taught all the time" Solon the Athenian..
"I don't mind  being taught all the time but I do mind a lot getting old" Antonis the Thessalonian..

amptramp

Re: Echoplex Preamp: analysis y mods.
« Reply #22 on: June 22, 2022, 06:52:44 AM »
Like the Tillman, you could put the JFET and everything connected to the gate and source in the guitar and everything connected to the drain in a separate box (that would not be a stompbox because it would always have to be there and would never be swapped out for anything different) and you would have a guitar where the drain resistor is essentially the output impedance of the guitar.  The gate filtering is the only difference from a Tillman in circuit topology.

pinkjimiphoton

Re: Echoplex Preamp: analysis y mods.
« Reply #23 on: June 22, 2022, 11:38:01 AM »
its funny shit,
as this "echoplex preamp" is still so popular, when it really isn't the preamp of an echoplex at all.

the "preamp" of an echoplex is just a simple buffer.

what this is is the tape saturation amp of the echoplex, what's used to drive the signal into the tape.

in an actual echoplex, this circuit isn't actually part of the audio path ;)

pink's crazy? on a rant? naaa.

look at the actual schematic lol

peas
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