Axis Face Silicon Rev 3 build report.

[formerMember1]

The Mayer mods to the Ge Dallas a 1k output resistor and a 2k fuzz pot. That ckt cleans up real well with the volume knob. So 1k2 may be a little stiff with si's/1k pot, but it works fine in the Mayer modded Dallas ckt.

hey fretwire i have a question for ya:

This mod that mayer did,(1k fuzz to 2k fuzz, 470ohm to 1k, 8.2k to 18k)(did he also change the output cap to .1uf or leave it stock at .01uf ?) is this what would make my Axis Face sound more like jimi's montery pop festival tone?  I would really like to get close to that tone, without taking a razor blade to my speakers like he did. LOL!! 

I tried these mods to a Dunlop Fuzzface once but couldn't get it to work right, but that was before i learned this much more about building fuzzfaces' etc...  I had already tried the 2k pot in my axis face by adding a 1k resistor in series with the ground lug,(that will do it right,...?) and at that time i already had the 470ohm at a 1k2 resistor value, but didn't change the 8.2k to 18k.  THat 8.2k to 18k should probably make that difference.  BUt i have a 10k trimpot there in place of the 8.2k, if i made that 18k wouldn't the fuzzface then not be biased right, or is that the whole point to getting that tone?  Or do i use a value close to 18k to get it biased right, since i don't have "his" transistors?

I think i am gonna try these mods again to this Axis Face...Or will they not work good since they are silicon trannies,...?

So again, Would this bring it too montery pop sound, or just closer to jimi's tone in general?

thanks, you have been an unbelievable help in the past few months since i joined this forum,...

[Fret Wire]

First off, use a .01 cap. The 18k and 33k resistors on the RM are for proper biasing with the 2k pot, which changes the voltages. You can't just add a 2k to an already tuned Dallas and expect it to be biased. Do you have a proper 2k pot around? When you use the 2k pot and 1k output resistor, you still bias the fuzz the same way. It's just that the values you settle on will be closer to 18 and 33k instead of the originals 8.2k and 33k.

[petemoore]

  Q2 collector resistor works good as a 20k pot
  Also, an 8k2 series with 10k pot = range between 8k2 and 18k2, a nice range and EZ to 'fine tune' setup.

[MartyMart]

The "RM" FF version is one of my most "used" fuzz's
I built one with a 50k trim for the 33k and a 20k trim for the 18k
for some "fine tuning"
I have no "2k" pots so have a 4k7 with two resistors across the lugs :
Lug 1 to 2 2k7 and lugs 2 to 3 2k7 , so the range is about 2k with some
"shape" to the log pot. ( it's a little above 2K to be precise )
It works very well, so much so that i just sold my "Real" RM FF this week !
I liked the output cap as a 0.047uf, its just a bit "fatter" sounding, the rest
is "stock" though I did try a 0.0022 cap from input to ground, for some
"fizz" roll off .... somewhere  !

MM.

[formerMember1]

yeah, fretwire helped me with modding it a bit for some RM tones.  Sounds way better than it was, even though it sounded great to begin with, it is now, just like Jimi, i am having a little trouble with it cleaning up right, but fretwire gave me two mods to try that i having been trying to decide which one i like better,

thanks fret!!

liked the output cap as a 0.047uf, its just a bit "fatter" sounding, the rest

i will have to try that too!!

i now could get really close to l"et the good times roll", foxey, voodoo, etc,...  COOL!!!!

[formerMember1]

Hi again

I have POPs when i bypass/turn on the Axis FAce silicon rev 3 and also my Rangemaster

I have 1M pulldown on the Axis Face input, and a 2.2M pulldowns on the Rangemaster, they are connected correctly.

Both pedals have LED's with 3pdt true bypass.

I tried removing the LED on the fuzz, but it still POPs, i even tried putting the LED on the top right and middle right lugs on the 3pdt as analogman does, instead of using the center lugs for power/LED, and it still POPs.

What could be doing this?

My wah i built is the only pedal that doesn't POP.

it is very annoying,,..i have searched the forum, but can't figure it out.

could i be getting switch POPs from the V+ wire in fuzzface and V- wire in RM going to the3pdt?

what can i do? 

*EDIT*
Could i use grounded input wiring instead like the original fuzz's?
will that cure the POP maybe?

thanks again

[petemoore]

  2m2 is probably small enough to discharge any charges the DC blocking caps might accrue, unless on is leaking.
  DC Blocking cap leakage debugs [cap replacement experiments] have sometimes eliminated popping, leaky film caps certainly aren't the norm, but since you've already tried everything else...

[formerMember1]

yeah, i forgot to mention that i changed the avx boxed metal films a few times, to see.  (i have a bunch of them)

I don't understand it.  Tried everything i know of, and it still POPs,  I thought it was the LED, but i disconnected the LED from the power wire and it still pops.

[javacody]

formerMember1, any chance of a schem that shows your final values?

[formerMember1]

Well, I actually removed the board from my pedal and sold it to someone, and then rebuilt with germanium transistors... so i can't remember what i did with the values but off the top of my head...

2.2uf input
.01uf output,
27K instead of 33K
and adjusted 8.2K until it biased to 4.3 volts...
2K fuzzpot instead

[brett]

Hi.

I have POPs when i bypass/turn on the Axis FAce silicon rev 3 and also my Rangemaster

I also have lots of popping.  I suspect the 3PDT switch.  Another possibility is feedback from the sudden increase in gain with most distortion pedals.  For the latter, try running the output wires as far as possible from the input wires.

Glad you like your avis face.
By the way, the tonal changes you get with changing between 1k2, 470 and 330 ohms were mainly caused by the effect of the bypass cap.  With larger resistors, smaller caps are needed.  e.g. a 0.047uF cap with a 470ohm resistor has similar top-end rolloff to a 0.022uF cap with a 1k2 resistor.  Double the resistor, halve the cap (and vice versa)

cheers

[formerMember1]

i will have to try changing the bypass cap with that resistor,.. thanks. i didn't know that..

I ususally run the input and wires seperate each other in the wah, but i will try it in the fuzz,... (the fuzz does have grounded input though)