Yack YF-2 Fuzz Box  [schematic]

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
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george giblet
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Post by george giblet »

Old and Rare.
Some parts are not known but I have worked out good estimates.
The filters (C6 and C8) were matched by using the sound samples.

Yack YF-2 Fuzz
Japan
1967 to 1969

http://www.effectsdatabase.com/model/yack/yf2

good pics:
http://electricpartslibrary.hatenadiary ... 0160803/p1

Sound sample from electricpartslibrary page: (if this link doesn't work go via previous page)
https://ec-media.sndcdn.com/ouZUywJZSjZ ... 4592d02735

v good pics:
https://reverb.com/item/3944443-yack-yf ... anese-fuzz


Comments, additions, fixes welcomed.
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Yack YF-2 Fuzz Box V1.0.png

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george giblet
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Post by george giblet »

I cleaned up a couple of minor things and added a part numbering pic.
If someone find another board pic they can used the part numbering pic to check the part values against the schematic.
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YF-2 part numbering.png
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Yack YF-2 Fuzz Box V1.1.png

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dv8r601
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Post by dv8r601 »

uber close up shot
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modman
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Post by modman »

?...
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Post by Dirk_Hendrik »

What is the 1967-1969 reference based upon?
Sorry. Plain out of planes.

http://www.dirk-hendrik.com

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george giblet
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Post by george giblet »

What is the 1967-1969 reference based upon?
It's a valid question. I did put some thought into it even though it may be wrong.

The 1967 was based on the electrolytic caps (early 1967). The range was something I found on the internet so it's an unofficial range.

There is another Yack product, the DA-1 Fuzz Box, which is very similar but not a 100% copy of the Ace Tone FM-1; the PCB looks identical but different parts are loaded. The FM-1 dates 1966/1967 through to 1968/1969; again unofficial figures.

So putting that loose info together I thought the 1967 to 1969 range from the internet was believable.
Given the rareness of the Yack pedals it's going to be had to get enough samples to improve the answer.

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Post by toneman »

the yf-2 box looks "flatter"(wider) and has a switch. the da-1 does not. Extra filter caps(?)

I luv old fuzzes.. :applause:

not much info at
http://www.effectsdatabase.com/model/yack/da1#pictures

8)
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Post by george giblet »

the yf-2 box looks "flatter"(wider) and has a switch. the da-1 does not. Extra filter caps(?)
From the outside that's it. They follow the wedge style enclosure from that era. Inside they are quite different.

The Tack YF-2 is unique, other than the similarities to the Fuzz-Face type ckt.

The Yack DA-1 is very similar to the Ace-Tone FM-1 but it's not a direct copy even though the PCB looks identical.
The DA-1 and FM-1 both use a similar ckt to the Maestro FZ-1. This group are all 3V units.

Analog guru did a partial schematic in 2007 for the Ace-Tone FM-1. The schematic has a few bugs, not because of tracing issues but because he had limited pics to work from - that's life tracing from pics. I've been able to gather a little more info but still not enough to create a complete schematic. I'll put up what I have when I have more time.
I luv old fuzzes.
Yes, until the internet I didn't realize there we so many from the 60's. Sometimes I don't like the sound 'out of the box' but they can be tweaked. LucifersTrip has done quite a bit of tweaking.
For some units there very little info.

I like the idea of documenting what these things actually were. It takes actually takes quite a bit of work. Without all the people on internet pitching in with snippets of info it would be an impossible task.

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Post by george giblet »

Very interesting, there's also a YF-1. It doesn't have a switch.

http://www.effectsdatabase.com/model/yack/yf1

It uses the YF-2 PCB. Clearly some parts for the switch are not loaded on the YF-1.

Another one!

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Post by toneman »

so......

maybe........

there's a da-2 :?: :scratch:

the one with a switch :hmmm:

yeh, the interweb allows folks from around the world to come together for a chance of fuzz :!: :wink:

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Post by george giblet »

there's a da-2
You never know! We know what to look for now.
There's no way I would have recognized the YF-1 without having looked at the YF-2.

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