EHX - Axis  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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pf_fan
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Post by pf_fan »

Those pics can be compared with the schematic from GEO-Fex:
http://www.geofex.com/FX_images/eh_axis.gif
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markm
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Post by markm »

Hey, there's some nice soldering huh? :P
Join together with the "Banned"!

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krome_magnon
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Post by krome_magnon »

Wonder if the decaying sponge thing and the spiderwebs add some vintage tone mojo?

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soulsonic
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Post by soulsonic »

krome_magnon wrote:Wonder if the decaying sponge thing and the spiderwebs add some vintage tone mojo?
Hey that's at least half of it! Once I cleaned the yellow "mystery powder" (decayed foam) out of my old Shure 55 it wasn't quite the same. :lol:

Meanderthal
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Post by Meanderthal »

I've built this... very much one o them in-a-godda-da-vida type fuzzes. Cool if ya wanna sound... old... :D

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Post by analogguru »

I've built this...
Hmmm....really ?.....from the schematic circulating around ? then you haven´t build THIS....

Because THIS is more like the Mosrite Fuzzrite, Orpheum Fuzz, Shin-ei FY-2 (or similar units) with a 100k and 47k in the collector path of the second transistor and a 100n from the node between the resistors to GND.

analogguru
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Dan N
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Post by Dan N »

Thanks for the photos!

AG, what would be the PNP compliment to the 2N5133?

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Post by analogguru »

2N 5133: 18V/50mA/200mW ß:60-1000/1mA fg>40MHz

A BC239C, a BC 550C or a 2N5088 should be usable as a replacement.

So a PNP equivalent would be for example a BC 309C or a BC 560C...

analogguru
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Meanderthal
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Post by Meanderthal »

analogguru wrote:
I've built this...
Hmmm....really ?.....from the schematic circulating around ? then you haven´t build THIS....

Because THIS is more like the Mosrite Fuzzrite, Orpheum Fuzz, Shin-ei FY-2 (or similar units) with a 100k and 47k in the collector path of the second transistor and a 100n from the node between the resistors to GND.

analogguru
Yep, it is one of those... the weird 'tone' control, etc. It wasn't the Mayer tweaked FF, rather it was the Orpheum type- AKA the 2 knob Foxey Lady.

However, I did build it from a schematic that had been floating around for a while, so it may not be exactly the same(didn't compare).

I used 2n5133, I socketed the trannies, and found that they had more grit than 2n5088,89, or mpsa18. Or maybe I fooled myself because they look so cool... :lol:

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