Joyo - JF-39 Deluxe Crunch

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Joyo - JF-39 Deluxe Crunch

Postby decora » 28 Jan 2013, 10:18

Picked this up last week, have not played much with it unfortunately. More than enough gain but i find that i'm wanting more from the Pre and Tone. This sounds more open than Joyo's Crunch (crunch more compressed to my ears). I stack overdrive pedals in front of it to make it tighter. Cracked it open today and took some gutshots for everyone. Cheers!

Vol - A10K, Dist - B100K, Presence B20K, Tone C10K.

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i'm using Picasa, if photos doesnt show up, i'll try and get a different hosting.

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Ice-9 (28 Jan 2013, 11:52), modman (28 Jan 2013, 17:53)
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Re: JOYO Deluxe Crunch JF-39

Postby decora » 28 Jan 2013, 10:50

photos...

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modman (09 Feb 2013, 17:29)
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Re: JOYO Deluxe Crunch JF-39

Postby soulsonic » 28 Jan 2013, 14:31

Ah, LEDs for clipping diodes.
Thanks for sharing!
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Re: JOYO Deluxe Crunch JF-39

Postby Buzz Crumhunger » 11 Aug 2014, 07:01

So, should I be not at all surprised that the PCB says "Joyo DLS" right on it? Anyone hear both of enough pedals (or know the schematic well enough) to assert that this is a copy/clone of the Catalinbread DLS?

Just curious...

Thanks!

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modman (11 Apr 2015, 15:47)
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Re: JOYO Deluxe Crunch JF-39

Postby mirosol » 11 Aug 2014, 07:19

Buzz Crumhunger wrote:So, should I be not at all surprised that the PCB says "Joyo DLS" right on it? Anyone hear both of enough pedals (or know the schematic well enough) to assert that this is a copy/clone of the Catalinbread DLS?

Just curious...

Thanks!


Umm.. DLS is made of six JFETs and here we have one JRC4580. So no. It's nothing even remotely close to Catalinbread DLS.
+m

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modman (11 Apr 2015, 15:57)
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Re: JOYO Deluxe Crunch JF-39

Postby grrrunge » 11 Aug 2014, 08:58

An older version of MI Audios Crunch box? The pot values and circuit simplicity seem right as far as i remember.
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Re: Joyo JF-39 Deluxe Crunch

Postby Desdog » 11 Apr 2015, 22:01

MI Audio Crunch Box uses this opamp: LM833
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Joyo Deluxe Crunch uses the compatible 4580:
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You could put this next to the gutshot:
deluxecrunch.png

and compare to the Mi Audio Crunch box schematic:
crunchboxshemo.png
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Re: Joyo - JF-39 Deluxe Crunch

Postby Rogerio » 29 Oct 2017, 22:08

Hi,

I am a beginner, and I have this pedal. I love its sound, but it's too much gainy for me, so I want to reduce gain and move it into the overdrive area. I want to ask this forum what mod to do, taking into account it will be difficult to change a small component. Perhaps to change the Gain pot to another value? Or the type of pot. I know Super Crunch Box has a low gain switch...it could be applied to this pedal? It may be a clipping section components change?

Thanks in advance.
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Re: Joyo - JF-39 Deluxe Crunch

Postby modman » 02 Nov 2017, 13:02

Rogerio wrote:Hi,

I am a beginner, and I have this pedal. I love its sound, but it's too much gainy for me, so I want to reduce gain and move it into the overdrive area. I want to ask this forum what mod to do, taking into account it will be difficult to change a small component. Perhaps to change the Gain pot to another value? Or the type of pot. I know Super Crunch Box has a low gain switch...it could be applied to this pedal? It may be a clipping section components change?

Thanks in advance.


Hi,
We don't have a schematic of this pedal available and even lost the gutshots because they were hosted on photobucket. If you can provide good quality gut shots of this pedal, other may be able to help out. We do have the schematic for the Joyo Crunch Distortion here: viewtopic.php?f=1&t=17055&p=188698&#p188698
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