Joyo - JF-04 High Gain Distortion  [schematic]

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

Joyo - JF-04 High Gain Distortion

Postby grrrunge » 05 Dec 2011, 15:14

This one definately holds some usable tones for the price, but doesn't come near any of the high gainers i've built over the last couple of months :)
The treble knob makes it shrill and ice-pick-y pretty fast, and overall the sound reminds me of a metal zone without the parametric mids.

Guts:
25112011342.JPG

25112011341.JPG

25112011340.JPG

25112011339.JPG


If anyone fancies it, i'll toss up a BOM as well. Perhaps we can get something properly useful out of this one 8)
You do not have the required permissions to view the files attached to this post.
A true believer in the magic of Sherwood Forest Pedal Pirates
---
New base of operations: http://www.knucklehead.dk

For this message the author grrrunge has received thanks:
modman (02 Sep 2017, 19:52)
User avatar
grrrunge
Diode Debunker
 
Posts: 743
Joined: 20 Mar 2010, 11:51
Location: Copenhagen, Denmark
Has thanked: 58 times
Have thanks: 200 times

Re: Joyo - High Gain Distortion

Postby grrrunge » 05 Dec 2011, 15:37

Does anyone have any clue as to which pedal this one is "loosely based on"? :D
A true believer in the magic of Sherwood Forest Pedal Pirates
---
New base of operations: http://www.knucklehead.dk
User avatar
grrrunge
Diode Debunker
 
Posts: 743
Joined: 20 Mar 2010, 11:51
Location: Copenhagen, Denmark
Has thanked: 58 times
Have thanks: 200 times

Re: Joyo - High Gain Distortion

Postby analogguru » 06 Dec 2011, 00:37

grrrunge wrote:Does anyone have any clue as to which pedal this one is "loosely based on"? :D

Yes, on a Marshall Shredmaster with fixed (omitted knob) bass control.

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

For this message the author analogguru has received thanks: 3
Blitz Krieg (31 Mar 2014, 10:25), grrrunge (06 Dec 2011, 11:44), modman (29 May 2015, 20:26)
analogguru
Old Solderhand
 
Posts: 3286
Joined: 26 Jun 2007, 14:58
Has thanked: 0 time
Have thanks: 112 times

Re: Joyo - High Gain Distortion

Postby guycapuano » 08 Dec 2011, 01:39

analogguru wrote:
grrrunge wrote:Does anyone have any clue as to which pedal this one is "loosely based on"? :D

Yes, on a Marshall Shredmaster with fixed (omitted knob) bass control.

analogguru


I would like to hear it side by side with a Son of Hyde or Jekyll and hyde hyde side!
User avatar
guycapuano
Breadboard Brother
 
Posts: 141
Joined: 21 Jul 2011, 23:36
Has thanked: 32 times
Have thanks: 10 times

Re: Joyo - High Gain Distortion

Postby atreidesheir » 02 Jul 2012, 02:02

What is better than one set of pics of dirty dirty joyo guts? that is correct more of the same. Just color me inspired by your snores. Fluxy guts!

Image
Image
Image
Image
Image
Image
Image
Image
Image
Image

pots are gain. treble, mids and volume
"Contemplate it - on the tree of woe." :Thulsa Doom

For this message the author atreidesheir has received thanks:
modman (29 May 2015, 20:26)
User avatar
atreidesheir
Diode Debunker
 
Posts: 747
Joined: 27 Apr 2010, 01:56
Location: Nashville
Has thanked: 452 times
Have thanks: 40 times

Re: Joyo - High Gain Distortion

Postby atreidesheir » 03 Jul 2012, 22:43

grrrunge wrote:This one definately holds some usable tones for the price, but doesn't come near any of the high gainers i've built over the last couple of months :)
The treble knob makes it shrill and ice-pick-y pretty fast, and overall the sound reminds me of a metal zone without the parametric mids.

I actually hold a much higher opinion of this bad boy. Very solid for Radiohead tone and far beyond. I dial in lots of mids and it is usable for the entire range of the gain knob from 7 to 5 0'clock. WINNER!
"Contemplate it - on the tree of woe." :Thulsa Doom
User avatar
atreidesheir
Diode Debunker
 
Posts: 747
Joined: 27 Apr 2010, 01:56
Location: Nashville
Has thanked: 452 times
Have thanks: 40 times

Re: Joyo - High Gain Distortion

Postby defec » 28 Mar 2014, 01:12

Does anyone know what the third dual opamp is for? A Shredmaster has only four opamp stages.
defec
 
Posts: 12
Joined: 17 Nov 2010, 02:35
Has thanked: 0 time
Have thanks: 0 time

Re: Joyo - High Gain Distortion

Postby tabbycat » 22 Nov 2014, 05:15

atreidesheir wrote:
grrrunge wrote:This one definately holds some usable tones for the price, but doesn't come near any of the high gainers i've built over the last couple of months :)
The treble knob makes it shrill and ice-pick-y pretty fast, and overall the sound reminds me of a metal zone without the parametric mids.

I actually hold a much higher opinion of this bad boy. Very solid for Radiohead tone and far beyond. I dial in lots of mids and it is usable for the entire range of the gain knob from 7 to 5 0'clock. WINNER!

analogguru wrote:
grrrunge wrote:Does anyone have any clue as to which pedal this one is "loosely based on"? :D

Yes, on a Marshall Shredmaster with fixed (omitted knob) bass control.

analogguru

have recently got hold of one of these for peanuts. it's pretty tasty sounding. bought it blind-on-hearing in a swap-thing before finding out about the shredmaster connection. but i get it. it's pretty much there. true bypass too, which the original wasn't.

am a big fan of the shredmaster's grit and squeal (radiohead 'paranoid android' hard not to like) but £100 for a real shredmaster is out if my range and a clone-build would be a mission too far for me atm.

but if there are any simple and sweet mods that can be done to this to raise its spec i'd definitely be up for trying and feeding back. got a few to try from a tdpri post (below) but has anyone experimented here?

for example analogguru says it's 'based-on' the sm with a fixed bass control. is there a straightforward way of patching that bass pot back in to the circuit? i'd like to see hear how much difference it makes to have that back in.

have to admit to being a little confused by the schematic.
http://www.matsumin.net/diy/jisaku1/shr ... ompenh.gif
i'm relatively new to the science of reading these and i've not seen a bass pot that piggy-backs, almost a trimmer, to the ground (effectively) of the tone pot.

so thinking about it another way i looked at mirosol's vero layout from guitar fx layouts (thanks miro) and it seems more comprehensible in principle.
http://3.bp.blogspot.com/-vWMkonkn1jc/U ... master.png
take up the thread from pin 5 of the first opamp to lug 1 of bass pot and feed back lugs 2 and 3 into lug one of the tone pot. that's an oversimplification, there are a few caps and a resistor to tack in, but that seems to be the practical gist.
but this route all depends on how faithful miro has been to the original shredmaster, and how faithful joyo have been to the original shredmaster. i'm working on resolving that but am a beginner at tracing so a bit slow.

defec wrote:Does anyone know what the third dual opamp is for? A Shredmaster has only four opamp stages.

discuss...?

have found some damn useful stuff re mods for caps at tdpri (thanks chaps) which i can fairly easily cope with, diode subs are obvious (into diode subbing atm), but nothing re reinstating the bass control.
http://www.tdpri.com/forum/stomp-box/32 ... ost4180275

having done the cap rotation mods for the joyo voodoo octave (foxx tone clone) and have to say these are a dream to mod. proper bits (no sm scabs) and well spaced. so am up for taking diabolical liberties with it as i don't feel it is too easily trashed.

any ideas or thoughts from jf-04 or shredmaster fans here?


Link


tabbycat.
"be a good animal, true to your instincts" (d.h. lawrence).
"there is no excellent beauty that hath not some strangeness in the proportion" (francis bacon).
"ni dieu ni maître" (anarchist slogan).
User avatar
tabbycat
Cap Cooler
 
Posts: 519
Joined: 03 Jul 2011, 01:09
Location: i could tell you but i'd have to kill you.
Has thanked: 227 times
Have thanks: 62 times

Re: Joyo - High Gain Distortion

Postby tabbycat » 23 Nov 2014, 22:41

if a mod would like to take a nuke to my above post it would be welcomed.

as this is basically a 'pimp-my-cheap-pedal' mod i have started a more thorough dedicated thread there.

viewtopic.php?f=11&p=245280#p245280

many thanks, tabbycat.
"be a good animal, true to your instincts" (d.h. lawrence).
"there is no excellent beauty that hath not some strangeness in the proportion" (francis bacon).
"ni dieu ni maître" (anarchist slogan).
User avatar
tabbycat
Cap Cooler
 
Posts: 519
Joined: 03 Jul 2011, 01:09
Location: i could tell you but i'd have to kill you.
Has thanked: 227 times
Have thanks: 62 times

Re: Joyo - High Gain Distortion

Postby tabbycat » 20 Jan 2015, 22:17

there is a new design for this one. my board dated 2010.11.24.

i have no idea what it is based on, unless it is a minimal make-over of the previously mentioned shredmaster and hyde-side of jeckyll and hyde.

detailed gut shots here.
viewtopic.php?f=11&t=25351&p=247323#p247323

can attach them into this thread if anyone wants me to. if you need any info about details of components i can provide but i'm pretty bad at tracing so just giving what i have for now for you to use and muse over as you wish.

enjoy.

tabbycat.
"be a good animal, true to your instincts" (d.h. lawrence).
"there is no excellent beauty that hath not some strangeness in the proportion" (francis bacon).
"ni dieu ni maître" (anarchist slogan).
User avatar
tabbycat
Cap Cooler
 
Posts: 519
Joined: 03 Jul 2011, 01:09
Location: i could tell you but i'd have to kill you.
Has thanked: 227 times
Have thanks: 62 times

Re: Joyo - High Gain Distortion

Postby howmuch » 13 Mar 2015, 01:11

This is a GREAT sounding pedal IMHO. Love it.
Here's a picture of mine.
Image
And here's the schematic. Let me know if anything's wrong.
Image
Looks like Joyo got it spot on with this one. No mistakes that I can see.
Not a 1:1 ShredMaster, but the differences seem to be deliberate - brighter, fixed bass, MOSFET input buffer. :D

For this message the author howmuch has received thanks: 3
allesz (13 Mar 2015, 18:48), ggedamed (14 Mar 2015, 13:57), tabbycat (11 Apr 2015, 01:58)
howmuch
 
Posts: 28
Joined: 09 Nov 2014, 19:31
Has thanked: 7 times
Have thanks: 17 times

Re: Joyo - High Gain Distortion  [schematic]

Postby howmuch » 29 May 2015, 18:13

Here's the Joyo JF-04 High Gain Distortion schematic at a finer resolution for better viewing.
You do not have the required permissions to view the files attached to this post.

For this message the author howmuch has received thanks: 3
287m (29 May 2015, 19:20), floris (03 Jan 2017, 21:49), modman (29 May 2015, 20:25)
howmuch
 
Posts: 28
Joined: 09 Nov 2014, 19:31
Has thanked: 7 times
Have thanks: 17 times

Re: Joyo - JF-04 High Gain Distortion

Postby Chrisfromiowa » 02 Sep 2017, 17:02

Joyo - JF-04 High Gain Distortion
Postby grrrunge » 05 Dec 2011, 09:14

This one definately holds some usable tones for the price, but doesn't come near any of the high gainers i've built over the last couple of months :)
The treble knob makes it shrill and ice-pick-y pretty fast, and overall the sound reminds me of a metal zone without the parametric mids.

Guts:
25112011342.JPG

25112011341.JPG

25112011340.JPG

Does anybody have a diagram for the daughterboard footswitch. I purchased another Ammoon/Joyo pedal that had a melted footswitch and am having a hard time rewiring it. I thought it was standard at first, but the LED with no resistor is not what I'm used to. Thanks, and thanks again. I know this is OT and an ancient thread..... Regards CFI
Chrisfromiowa
 
Posts: 5
Joined: 28 Dec 2015, 15:28
Has thanked: 0 time
Have thanks: 0 time


Return to Modern Stompbox Effects (1975 - ...)

Who is online

Users browsing this forum: GuineaFowl and 13 guests