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Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 06 Feb 2015, 02:55
by FuzzMonkey
Image

One assumes its the same circuit as its little brother.

Re: Dunlop Band of Gypsys JHF3 Fuzz Face  [traced]

Posted: 09 Feb 2015, 22:40
by The Rotagilla
I thought I had read that it's the fuzz side of an Octavia pedal.

Re: Dunlop Band of Gypsys JHF3 Fuzz Face

Posted: 10 Feb 2015, 09:34
by FuzzMonkey
So it seems.

Re: Dunlop Band of Gypsys JHF3 Fuzz Face

Posted: 09 Mar 2015, 09:36
by FuzzMonkey
Some more images:

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Image

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Re: Dunlop Band of Gypsys JHF3 Fuzz Face

Posted: 13 Aug 2015, 08:46
by FuzzMonkey
A few other images:

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Image

Image

Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 18 Mar 2017, 20:27
by FausterCraster
Up.. I'm going to buil it.
Please note that looking to the board I noticed different values for R11 and R13

Anyone know what is the capacitor on C7 ?
What are NPN Transistor Q1 & Q2 ?

R1 680k
R2 820k
R3 180k
R4 220K
R5 1K
R6 220K
R7 470E
R8 47k
R9 100E
R10 1K
R11 470E (NO 560E)
R12 1K
R13 220E (NO 100E)

C1 22U
C2 CERAMIC MULTILAYER (150p maybe)
C3 100N
C4 100N
C5 22U
C6 22U
C7 POLARIZED ??
C8 4N7
C9 4N7
C10 1N

Q1 & Q2 ??
Q3 BC558

While R101, C101, C102, C103 are not present onto the board (as far as I see).

Double check is welcome.
TX

Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 19 Mar 2017, 09:05
by mirosol
A few more shots would clear things up. However, i believe the R101, C101, C102 and C103 may be SMD parts under the board. This would be consistent with Dunlop build methods.
As for C7, my guess would be 1u axial tantalum. Again, the value isn't visible on the photos. C1 could also be 1n. This is based on the guess that all the rest of picofarad value caps may be SMD.

Maybe that's enough guesses? Breadboarding could help.

Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 19 Mar 2017, 11:22
by FausterCraster
C1 can't be 1n.. maybe you meant C101.
All multilayer caps are yellow ones (clearly in the picture), so I suspect C101, C102, C103 are in pF.

BTW, what about NPN transistor (which one) ?

TX

Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 19 Mar 2017, 11:28
by mirosol
Ah! My bad. Typoed the designation. I meant C2. This would make sense as 1n since the 101 etc are most likely in picofarad range. Or it could possibly be 10n as well - as found in some tonebenders to tame the screeching highs from the input.

Again, guesses :) I haven't seen the original except for photos.

Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 19 Mar 2017, 11:59
by EmmG
Here's another shot I found online. I looked up C7's label (1425) on the Kemet site and got this number back: T111B904K050AS. It's a 0.9uf.

Image

Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 19 Mar 2017, 12:19
by mirosol
Nice! Still, for a build, the 1u will be close enough.

So what we're basically missing is the bottom images and a value for that MLCC. Transistor type is somewhat irrelevant as one could argue other being better than another for days.

Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 22 Mar 2017, 22:39
by ThiagoFaraday
R13 120E

Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 23 Mar 2017, 11:51
by tube-exorcist
ThiagoFaraday wrote:R13 120E
R13 = 10k

Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 25 Mar 2017, 15:45
by FausterCraster
R13 ??
what is wrong in 220E ?

Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 25 Mar 2017, 15:47
by FausterCraster
It's verified.
Nice fuzz.

Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 25 Mar 2017, 17:03
by Manfred
FausterCraster wrote:R13 ??
what is wrong in 220E ?
I would rather say that that the ring colors are brown-black-black-red which determine the resistance value,
which would lead to a value of 10 Kiloohms.
The resistors R13 together with the capacitor C10 act as low-pass filter.
With a resistance of 220 Ohms gives a roll-off frequency of about 723 Kilohertz,
with 10 Kiloohms a roll-off frequency off about 16 Kilohertz.
This is why I believe that 10 Kiloohms are the right value,
because a low-pass filter with 723 Khz make no sense in this application but 16 Kilohertz is more likely.

Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 21 Jun 2017, 13:00
by swt
do you guys know why they've chosen a 220k resistor inthe cathode follower stage?. it seems pretty high. the original had 22k in there.
i also think the last resistor is 10k. but it shouldn't be calculated as an isolated part...because it's part of a 2 pole low pass filter formed by r12,13 and c9,10.

Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 26 Jun 2017, 12:51
by crazyhendrix
FausterCraster wrote:It's verified.
Nice fuzz.
This works? Any suggestions?

Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 14 Aug 2017, 16:20
by EmmG
I built one using Storyboardist's layout:
https://effectslayouts.blogspot.com/201 ... -face.html
Image

It's very high gain with overwhelming "bloom" type fuzz and strong sustain. The gain knob is useful all the way and very interactive with the guitar's volume control - like a good fuzz.

Thread for the "mini" version:
viewtopic.php?f=7&t=25252

Telecaster forum thread pointing to this one and with accurate reviews:
http://www.tdpri.com/threads/npd-band-o ... ce.584287/

There's a newer Dunlop "Gypsy Fuzz" in a 1590B with a tone control.

Re: Dunlop - JHF3 Band of Gypsys Fuzz Face

Posted: 14 May 2018, 01:32
by bc108
Any confirmation about Q2 and Q3?
I've read that they're MPSA3904's there