Roger Mayer - Axis Fuzz  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
Fanum
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Post by Fanum »

Well, the funny thing is that he initially thought the fuzz with these components .... Perhaps the original Axis Fuzz them had ... Octavia have ... and the axis fuzz is its close relative ...
Of course, now no longer used (do not see the components and even the slopes, as can be seen from the new AF).
Ah !.... confirm .... the sound changes enough .... with or without. (ie audible)

Excuse my poor English
Fanum

P.S for you which is the right hfe of the transistors?

swt
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Post by swt »

i have a bunch of the motorolas, so let me check for hfe of the ones that bias ok....

Khaba-khaba
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Post by Khaba-khaba »

Attachments
mini_mod_for_axisfuzzschem.gif
mini_mod_for_axisfuzzschem.gif (10.98 KiB) Viewed 63 times

Fanum
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Post by Fanum »

swt wrote:i have a bunch of the motorolas, so let me check for hfe of the ones that bias ok....
UP :P

swt
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Post by swt »

ups sorry for the delay...i'm on holidays. Give me a couple of days and will check them...

Fanum
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Post by Fanum »

swt wrote:ups sorry for the delay...i'm on holidays. Give me a couple of days and will check them...
Don't worry.. :popcorn:

andres_a884
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Post by andres_a884 »

Hi,
Does anyone Know if this layout can be build with AC127 and Ac128 I have a couple of them and want to use it.

https://www.freestompboxes.org/download/fil ... &mode=view

Thanks,
Ariel.

andres_a884
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Post by andres_a884 »

Built the PTP board and works perfectly, now I´m testing AC128, AC127 and B324 germanium transistors searching for the goods ones, with silicon transistors works fine.

Some photos,

http://www.flickr.com/photos/38980696@N ... 140962499/

Which is the best way to test germanium transistors ?.

Thanks.

DougH
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Post by DougH »

Fanum wrote:Well, the funny thing is that he initially thought the fuzz with these components .... Perhaps the original Axis Fuzz them had ... Octavia have ... and the axis fuzz is its close relative ...
The story from 'somewhere' (RM?) was that this filter was needed in Europe but not in the U.S. (?!?!?!?) Smells like BS to me... I suspect it was part of whatever circuit he used to develop the Axis Fuzz from, and the Octavia, and whatever else he also based on it. Then at some later date he realized it wasn't needed. Just a guess... YMMV.
"You have just tubescreamered or fuzzfaced yourself " -polarbearfx

analogguru
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Post by analogguru »

analogguru wrote:The use of this RC-Network is described here on page 3:
http://www.tcaas.btinternet.co.uk/jlh1970.pdf

These components reduce the (inaudible) High-Frequency-response and are used to avoid High-Frequency-oscillation. Therefore not really needed in this application and omitted.

analogguru
There´s a sucker born every minute - and too many of them end up in the bootweak pedal biz.

DougH
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Post by DougH »

Thanks AG for clearing that up. I thought this circuit came from somewhere else (i.e. not RM).
"You have just tubescreamered or fuzzfaced yourself " -polarbearfx

GBlekas
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Post by GBlekas »

IvIark wrote:I may as well add this to the thread for anyone interested in turrets or ptp wiring:
The attachment Roger Mayer Axis Fuzz - IvIark.png is no longer available
On Fuzz Central there is a recommendation to omit the 220R + 1nF in column 5 so it may be worth experimenting.
Axis fuzz turret layout.PNG
I was looking at the layout and just wanted to point out a duplication of a cap.
I believe only one of these are needed, if I am following the schematic correctly.

Looks cool though so thanks for your time!

George

IvIark
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Post by IvIark »

Yes you're right, it's been duplicated so you could make it 1 column narrower. It looks as though I've shown the volume pot backwards as well, you should swap 1 and 3. That'll teach me to interpret pots on schematic literally, although in my defence that was one of my early layouts! :D
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP

andregarcia57
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Post by andregarcia57 »

Hello ... Does anyone know Hfe values of Q1 and Q2 from the original RM?

Cigano23
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Post by Cigano23 »

andregarcia57 wrote:Hello ... Does anyone know Hfe values of Q1 and Q2 from the original RM?
They're around 150-200hfe.

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