Re: Square Wave on the MG (LFO) Instead of Triangle?
2013-08-23 by chipaudette
I brought home an oscilloscope last night. It is indeed a square wave at Pin 7 of IC16. Great! In looking at its amplitude, I see that the amplitude of the
Messages
Browse messages
Page 40 of 114 · 5658 messages matched
Re: Note-On Oscillator Reset, like on Taurus
2013-08-22 by chipaudette
Oh, and in case it wasn t clear, this feature was in the Minitaur because (Moog says) it was one of the important features of the Taurus that gave it its very
Re: Square Wave on the MG (LFO) Instead of Triangle?
2013-08-22 by chipaudette
Taking another look at the schematic (I don t have my oscilloscope right now, so I can t just go measure things to answer my own question), I think that I now
Note-On Oscillator Reset, like on Taurus
2013-08-22 by chipaudette
Continuing the discussion about the Taurus from the Deeper Bass thread... When the Minitaur came out, Moog talked about its unusual oscillator sync feature
Re: Deeper Bass, Bypass C61 on KLM-368
2013-08-22 by feline1973
Well, you say that - but again, in all seriousness, what makes the Taurus sound so deep is not that it s billowing out a sine wave at 30Hz: it s more to do
Re: [PolySix] Deeper Bass, Bypass C61 on KLM-368
2013-08-22 by Oakley Sound
C61 is a crappy electrolytic capacitor. Removing it will have a beneficial effect on distortion as well as increasing LF response. The less electronics a
RE: [PolySix] Square Wave on the MG (LFO) Instead of Triangle?
2013-08-22 by backshall1
There s definitely a square wave there already on the LFO. I can t remember exactly where, but I know I ve seen it on the scope. I ve got too many other
Square Wave on the MG (LFO) Instead of Triangle?
2013-08-22 by chipaudette
Hi All, I m looking to mod my Polysix to get other waveforms for the MG (LFO). Right now, as you all know, the MG has a triangle waveform. I d really like a
Re: [PolySix] Resonance on one voice not working correctly
2013-08-21 by Bob Stewart
Good work :-) I ve actually got the synth in again for some other issues, so may try a new socket while I ve got it. Will let you know if it does the job. B
Re: More photocoupler info
2013-08-21 by chipaudette
That s a *great* link. I particularly like the basic discussion of how the auto-tuning system works in the Polysix. Outstanding. Chip
More photocoupler info
2013-08-21 by Donald Backshall
Take a look at this blog by Stefan Huebner. He took some measurements with an old P1501 and a couple of Vactrol parts and made a nice chart showing response
Re: Deeper Bass, Bypass C61 on KLM-368
2013-08-21 by chipaudette
I m not going to deny that line of thinking in any way at all. It is super deep, which means that it s inaudible without a lot of power and mass to make it
Re: Deeper Bass, Bypass C61 on KLM-368
2013-08-21 by feline1973
Not wanting to be an old sourpuss, but adding 6dB boosts to something at 30Hz is usually a good way to totally ruin a mix :) It is very hard to accurately
Re: [PolySix] Resonance on one voice not working correctly
2013-08-21 by Patrick Belcher
Hi Bob, I got this sorted in the end by putting new sockets for the filter chips in and re-flowing all joints. Before, I was losing amplitude at either end of
Re: [PolySix] Deeper Bass, Bypass C61 on KLM-368
2013-08-20 by Chromatest J. Pantsmaker
I play a lot of bass-heavy music. It would be super easy to add a switch for this mod. I look forward to trying this on my big subwoofers!
Deeper Bass, Bypass C61 on KLM-368
2013-08-20 by chipaudette
I finally followed-up on Tony s suggestion that C61 on KLM-368 appears to have no purpose and that it could be removed. When I look at C61, I also see no
Re: Making the P6 brighter
2013-08-19 by chipaudette
While I don t know if it s necessary to remove the chip, its output will be fighting with the now-jumpered direct signal. I don t know who would win that
Re: [PolySix] Re: Making the P6 brighter
2013-08-18 by Frank Carvalho
Worked for me too. But I was wondering. If you are jumpering the signal directly to output, bypassing the VCF chip, is it at all necessary to remove the chip?
Re: [PolySix] P6 scaling issue
2013-08-18 by Frank Carvalho
No suggestions so far about resistor values. Well, I thought that the worst thing that could happen would be, that the P6 still scaled strangely. So I replaced
Re: [PolySix] P6 scaling issue
2013-08-18 by Frank Carvalho
Thanks That certainly is a better scan. I am still uncertain about the adjustment of resistors though. Should that R85 resistor be different, given the
Re: [PolySix] P6 scaling issue
2013-08-17 by Ben Stuyts
There is a good scan of the service manual available for download at http://www.synfo.nl Ben
RE: [PolySix] P6 scaling issue
2013-08-17 by Frank Carvalho
And another thing: The copy of the schematics in the files section is very difficult to read to the point where I can not figure the component numbers, and I
RE: [PolySix] P6 scaling issue
2013-08-17 by Frank Carvalho
Thank you. My technician only had a VTL5C1, which does not exactly match the characteristics as the VTL5C3 recommended. Can anyone suggest how a VTL5C1 would
Re: [PolySix] Re: Disabling the Built-In Detuning
2013-08-17 by Peter Mörck
He knows :) In the post he linked to: The result is that the detuning has been successfully disabled. Now, when I switch to Unison mode, it sounds just like
Re: Disabling the Built-In Detuning
2013-08-17 by Mekonin
Don t forget that you can use Chord Memory to stack up up to six voices without them being detuned.
Disabling the Built-In Detuning
2013-08-17 by chipaudette
I ve been living with my Arduino-based detuning modification for quite a while now...and I *love* it. My only real issue is that, when I switch the Polysix to
Re: [PolySix] Re: Making the P6 brighter
2013-08-14 by james meagher
The link worked for me. And thanks for posting this - I m very excited about this mod. I was about to do it last week, but when I fired up my PolySix for the
Re: Making the P6 brighter
2013-08-14 by chipaudette
I decided to make my non-destructive modification a bit more permanent. I removed the clip lead and, in its place, I soldered in a jumper wire. Now the synth
RE: [PolySix] P6 scaling issue
2013-08-13 by backshall1
Yes, that does sound like an opto-coupler issue. It s the P1501 chip on the oscillator board. It looks like a 6-pin DIP chip, but it only has 5 pins and one of
P6 scaling issue
2013-08-13 by Frank Carvalho
Hello I am sure this is a classic issue, but it just happened to me now, and I need some advice. My P6 has not been used for a while, and since electronic
Re: MG Delay at Zero Still Delays
2013-08-11 by chipaudette
And now I ve modified the circuit by swapping R98 from the 4.7K default value up to a 10K value. Now, when the MG Delay is turned to zero, it correctly
Re: MG Delay at Zero Still Delays
2013-08-11 by chipaudette
Sorry about the weird link...it seems that the URL is one character too long for the line-wrapping here. Wacky. Anyway, I ve spent a little time exploring the
Re: MG Delay at Zero Still Delays
2013-08-10 by synth_o_sphere
Well, link still not working, but I managed to fix it manually. Folks: just add and l (letter elle , not number one) after .htm Will try to reproduce it
Re: Help! Repairing a Polysix with burst battery (sound demo + photos!)
2013-08-07 by traxus12
Haha...figures. Okay, I ll report back after doing some more poking around over the next few days. Cheers.
RE: [PolySix] Re: Help! Repairing a Polysix with burst battery (sound demo + photos!)
2013-08-07 by backshall1
That s a nice meter. On the Rx1 scale you should easily be able to see if any tracks are approaching 1 ohm, which is a sign they should be fixed. Just make
Re: Help! Repairing a Polysix with burst battery (sound demo + photos!)
2013-08-07 by traxus12
Thanks. I haven t tried that. I ll check it out. It s nice to have a little more direction now. I wish the problem were more obvious. It reminds me of Where s
Re: Help! Repairing a Polysix with burst battery (sound demo + photos!)
2013-08-07 by traxus12
Thanks! I ll try that. Hopefully I can find the culprit. By the way, I m using a Simpson 260-8XI analog multimeter. I just remembered that the previous owner
Re: Help! Repairing a Polysix with burst battery (sound demo + photos!)
2013-08-07 by Djé
when you press the 8-switch what happening ? you can use the others switch A to C and 1 to 8 ? Make a bonding test of Pin5 and GND to de CN10 of the KLM-371
Re: Help! Repairing a Polysix with burst battery (sound demo + photos!)
2013-08-07 by traxus12
I tried removing the screw and powering up. No change. If only it could be that simple!
Re: [PolySix] Re: Help! Repairing a Polysix with burst battery (sound demo + photos!)
2013-08-07 by Chromatest J. Pantsmaker
A debugging rule that people overlook is that not only do you want to check low-resistance continuity between your points (your DMM s beep might trigger
Re: MG Delay at Zero Still Delays
2013-08-07 by chipaudette
Hmm...let s try that link again: http://synthhacker.blogspot.com/2013/08/polysix-mg-delay-of-zero-is-not-zero.html Chip
Re: Help! Repairing a Polysix with burst battery (sound demo + photos!)
2013-08-07 by Djé
Hi Steve, The D(SW12) and 4(SW18)Switches uses the same line in the Programmer matrix, identified P13, Pin-5 of CN10 welded to the KLM-371(programmer board) On
Re: MG Delay at Zero Still Delays
2013-08-07 by chipaudette
I put up an audio sample and a visual illustration of this unexpected behavior:
RE: [PolySix] Re: Help! Repairing a Polysix with burst battery (sound demo + photos!)
2013-08-07 by backshall1
That board doesn t look too bad at all. Most look much worse after a battery leak. Unfortunately that means there is no easy way to point to the problem
Re: [PolySix] Re: Help! Repairing a Polysix with burst battery (sound demo + photos!)
2013-08-07 by Chris Logue Smart
Mate, that sounds wicked! Proper Residents style! Obviously you probably don t want it to sound like that all the time...... Good luck on here. Someone usually
Re: Help! Repairing a Polysix with burst battery (sound demo + photos!)
2013-08-07 by traxus12
Sorry, some of my formatting didn t make it through to the final post. I meant to include these. sound demo:
Help! Repairing a Polysix with burst battery (sound demo + photos!)
2013-08-07 by traxus12
Hello! I picked up a Korg Polysix recently and I ve been trying to bring it back to life. Nothing I ve done has changed anything yet so I m at a bit of an
Re: MG Delay at Zero Still Delays
2013-08-06 by synth_o_sphere
Hey Chip, I was not able to reproduce what you describe. When I play new notes, they come in at the filter value prescribed by the MG, wherever this one is in
Re: MG Delay at Zero Still Delays
2013-08-06 by chipaudette
I decided that the easiest modification would be to change R98 on KLM-367. Making its value bigger will prevent the cap C33 from discharging all the way down
Re: MG Delay at Zero Still Delays
2013-08-06 by chipaudette
well, on my cheap scope, using a 10x probe seems to increase the apparent input impedance...so i can now get a decent reading of the CV for MG Delay. When set