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Juno 106 Chorus Chip
Old 1 week ago
  #1
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base615's Avatar
Juno 106 Chorus Chip

Looks like the chorus chip on my Juno just shat itself. The noise has always been fairly minimal but just now I've had to check I haven't patched in a compressor on heavy settings.

Anybody have any idea where you can get one these days without cannibalising another synth?

Surely there's someone in the Philippines or somewhere making these but my searching is coming up completely blank. I can survive with putting TAL chorus on it for a while but it's not quite like the real thing.
Old 1 week ago
  #2
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have seen mn3009 on aliexpress, around 8.50 each plus
shipping, 2 needed. there's a facebook group where
Lektroid (member here?) seems to have been able to
use them. check the recent mks50 thread;

but from the discussion, it could any of a number of
elements, eg: surrounding capacitors etc.
Old 1 week ago
  #3
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Quote:
Originally Posted by babylonpanic View Post
have seen mn3009 on aliexpress, around 8.50 each plus
Those are very probably fake.
Source is not right and price is not right.
Old 1 week ago
  #4
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Quote:
Originally Posted by monomer View Post
Those are very probably fake.
Source is not right and price is not right.

yes. but check discussion here, see what you think.

Look down about 3/4 where a discussion starts about
juno chorus issues, and Richard Lektroid mentions that
he sourced and installed some via a chinese supplier.
seems to imply that they worked. could there be some
bona fide suppliers of this part? (otherwise paying 40-75
for other unknown, x2, can get a bit pricey, if they are
reputed to have had an original 70% failure rate, or are
pulled and already used?) (not my area of expertise,
i just followed a thread the other day and ended up on
the facebook page).

Last edited by babylonpanic; 1 week ago at 02:00 PM..
Old 1 week ago
  #5
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Quote:
Originally Posted by monomer View Post
Those are very probably fake.
Source is not right and price is not right.
or? the MN3007 trick, and get a cleaner chorus?
Old 1 week ago
  #6
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monomer's Avatar
 

Quote:
Originally Posted by babylonpanic View Post
yes. but check discussion here, see what you think.
(i know you refurbish synths)

Look down about 3/4 where a discussion starts about
juno chorus issues, and Richard Lektroid mentions that
he sourced and installed some via a chinese supplier.
seems to imply that they worked. could there be some
bona fide suppliers of this part? (otherwise paying 40-75
for other unknown, x2, can get a bit pricey, if they are
reputed to have had an original 70% failure rate, or are
pulled and already used?) (not my area of expertise,
i just followed a thread the other day and ended up on
the facebook page).
You didn't link anything
But anyway, what you found is too cheap and it's from ali. Almost no chance you won't get screwed.

I mean, if you're up for a gamble you could buy one. But a faulty chip could mess other things up. Not worth the chance imo.
Old 1 week ago
  #7
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Quote:
Originally Posted by monomer View Post
You didn't link anything
But anyway, what you found is too cheap and it's from ali. Almost no chance you won't get screwed.

I mean, if you're up for a gamble you could buy one. But a faulty chip could mess other things up. Not worth the chance imo.

oh yeah forgot the link...
Synthesizer Spares or Repair public group | Facebook

what do you think of the MN3007 solution, changing resistors?
just going on what i'm reading. you'll see the mentions of the
other stuff involved, other scenarios for faults.
anyway, MN3007s turn up in cheap Realistic things as reverbs.
Old 1 week ago
  #8
Gear Maniac
 

Check with Rosen Sound in Burbank, CA.

Rosen Sound | All Things Synthesizer

They restore these synths with new and vintage chips.
Old 1 week ago
  #9
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base615's Avatar
Cheers guys
Old 1 week ago
  #10
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monomer's Avatar
 

Quote:
Originally Posted by babylonpanic View Post
what do you think of the MN3007 solution, changing resistors?
I dunno. I don't know how this ic sounds and how using it compares to the 3009.
Old 1 week ago
  #11
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okay - what i *read* was that Murray KiwiTechnics knows about it,
and a friend/colleague tried it - it's documented somewhere in what
i read up the other day. i think it's the same pinout (check BBD manual.pdf)
and has 4x number of steps, so resistors are changed to change the
clocking of the MN3101. which, it was said, made the chorus 'cleaner'.
which i guess would make sense, if the signal degrades the further
down the bucket brigade it gets. ??
in that 'manual', all the specs for that series are listed.. let me see
if i bookmarked it... here you go:

http://www.sdiy.org/BBDHell/BBD-Manual.pdf
(page 3)
the 3009 is a 'single type' low noise, and so is the 3007, and there's
also a 3008 (twice the steps again), and of course the 3005, which
doubles it again (4096). all single/low noise. looks like the 3004
could work as well, depending on .. well, spose it would require
full reading of the spec fo all of them.

3004 is physically different, as is 3005. 3007 is an 8pin DIL thing,
3008 looks like the 3005, and 3009 is 8pin, looks like same pinout.
Old 1 week ago
  #12
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It's possible whatever Behringer/TC have done for the June-60 pedal may work.. I haven't seen one opened yet though as they're not quite in the wild (could also be a stop-gap if just plugged into the output)
Attached Thumbnails
Juno 106 Chorus Chip-june60.png  
Old 1 week ago
  #13
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monomer's Avatar
 

Quote:
Originally Posted by babylonpanic View Post
okay - what i *read* was that Murray KiwiTechnics knows about it,
and a friend/colleague tried it - it's documented somewhere in what
i read up the other day. i think it's the same pinout (check BBD manual.pdf)
and has 4x number of steps, so resistors are changed to change the
clocking of the MN3101. which, it was said, made the chorus 'cleaner'.
which i guess would make sense, if the signal degrades the further
down the bucket brigade it gets. ??
in that 'manual', all the specs for that series are listed.. let me see
if i bookmarked it... here you go:

http://www.sdiy.org/BBDHell/BBD-Manual.pdf
(page 3)
the 3009 is a 'single type' low noise, and so is the 3007, and there's
also a 3008 (twice the steps again), and of course the 3005, which
doubles it again (4096). all single/low noise. looks like the 3004
could work as well, depending on .. well, spose it would require
full reading of the spec fo all of them.

3004 is physically different, as is 3005. 3007 is an 8pin DIL thing,
3008 looks like the 3005, and 3009 is 8pin, looks like same pinout.

Well, according to the graph the 3007 covers the time range of the 3009 so that makes sense.
What i'm more worried about is the clocking circuitry.
You'll need an offset for the base frequency and i guess a scaling of the modulation of the clock.
But i haven't looked at the schematics of this clock and have no idea how things work out.
The clocking may also behave differently at this higher frequency, possibly less stable.

Lots of things to consider i guess.
BTW, i have no experience with any of this (well, besides some not-so-authentic recreations of the chorus in various modular softwares). So i'm not familiar with this circuitry.
Old 1 week ago
  #14
Too good to be true?
IC, MN3009 BBD
Old 1 week ago
  #15
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Quote:
Originally Posted by monomer View Post
BTW, i have no experience with any of this (well, besides some not-so-authentic recreations of the chorus in various modular softwares). So i'm not familiar with this circuitry.
yeah my bad, i was thinking minime there.

also had a go at a very version of this chorus in SynthEdit.
Old 1 week ago
  #16
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Quote:
Originally Posted by Dj Sycamore View Post
Too good to be true?
IC, MN3009 BBD
no, just out of stock.
Old 1 week ago
  #17
Gear Maniac
 

Just contact Rosen man. They restore these boards as a business
Old 1 week ago
  #18
Quote:
Originally Posted by babylonpanic View Post
no, just out of stock.
Ah, whoops. I had the link saved from a while back for reference and didn’t look close this time around
Old 1 week ago
  #19
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WozNYC's Avatar
Quote:
Originally Posted by babylonpanic View Post

have seen mn3009 on aliexpress, around 8.50 each plus shipping.
You know pretty much everything they sell is fake / counterfeit, right?
I wouldn't recommend them for anything.
Old 1 week ago
  #20
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Quote:
Originally Posted by WozNYC View Post
You know pretty much everything they sell is fake / counterfeit, right?
I wouldn't recommend them for anything.
alright! so in spite of that, i was saying that i'd read someone
saying they'd fitted some they got via that site, on their facebook
synth repair group, which i linked to in the other thread about
this very subject, the one about mks50 (where's that thread gone).
this is why i mentioned it. (forgive me, just been replying to a very
aggravating email series i just received)
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