Re: [PolySix] RE: Polysix tuning difficulties.
2014-03-02 by Bob Grieb
Hi, I have uploaded a redrawn schem of the Poly6 antilog circuit. I hope this will help anyone who is working in this area. If we learn more about
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Re: [PolySix] RE: Polysix tuning difficulties.
2014-03-02 by Bob Grieb
Good work! My tuning is pretty close, but I have not touched the antilog trimpots, so I am looking forward to getting this really nailed so that I can get
Re: [PolySix] RE: Polysix tuning difficulties.
2014-03-02 by Malte Rogacki
And finally: I ve tuned the Polysix (so far just preliminary). There still is some small room for improvement but except for the lowest 16 octave I have a
Re: [PolySix] RE: Polysix tuning difficulties.
2014-03-02 by Malte Rogacki
I ve managed to improve the scaling a bit. Before: 0.018 0.042 0.090 0.185 0.375 0.755 1.513 3.03x After: 0.023 0.045 0.090 0.182 0.366 0.740 1.490 2.98x VR1
Re: [PolySix] RE: Polysix tuning difficulties.
2014-03-02 by Malte Rogacki
And here s the voltage for all C keys, starting from the lowest C and 16 to the highest and 4 . Measured on the new production board, after the
Re: [PolySix] RE: Polysix tuning difficulties.
2014-03-02 by Malte Rogacki
And one final thought before I retire for tonight: I don t think the test mode for the key assigner puts out 0, 2.5 and 5V respectively. The test mode for the
Re: [PolySix] RE: Polysix tuning difficulties.
2014-03-02 by Malte Rogacki
Measurements on and old production board. TP2 and TP3 are obscured by the KLM396A board which must be removed. TP2 16 : -8.40 8 : -11.02 4 : -13.30 TP3 16 :
Re: [PolySix] RE: Polysix tuning difficulties.
2014-03-02 by Malte Rogacki
Another idea: They built in three TPs that are only useful for calibrating the antilog amp. TP4 first caught my eye. This is -10V. With the Trident you were
Re: [PolySix] KLM-367 voltage deviations.
2014-03-01 by <josh.nursing@gmail.com>
Thanks for sharing your measurements, Bob. I m going to assume mine are fine then and proceed with another tuning round.
Re: [PolySix] KLM-367 voltage deviations.
2014-03-01 by Bob Grieb
Oops! Should be IC7-1 Sorry about the typo. Bob ________________________________ From: Bob Grieb To:
Re: [PolySix] KLM-367 voltage deviations.
2014-03-01 by <josh.nursing@gmail.com>
I7-7 gave 0 - 4.97V.
Re: [PolySix] KLM-367 voltage deviations.
2014-03-01 by Bob Grieb
Hi Josh, Here is what I measure (poly, manual) Cutoff Ctl at 10: IC7-7 = 4.91 IC8-1= -7.36V Cutoff at 0: IC7-1 =
Re: [PolySix] KLM-367 voltage deviations.
2014-03-01 by <josh.nursing@gmail.com>
I was expecting -7.5 | 7.5V and a swing of +-5V respectively. What should the values be at I7-7? Yash
Re: [PolySix] KLM-367 voltage deviations.
2014-03-01 by Bob Grieb
Better to measure at IC7-7. After IC18-14 there is an RC filter and then a unity gain voltage follower/buffer. You can measure at IC7-7 without
Re: [PolySix] RE: Polysix tuning difficulties.
2014-03-01 by Malte Rogacki
While indeed the oscillator has a different design it should still be possible to get the antilog amp calibrated better. I actually think that the whole test
Re: [PolySix] RE: Polysix tuning difficulties.
2014-03-01 by <chipaudette@yahoo.com>
The Mono/Poly uses a completely different VCO design. The Mono/Poly has Volt/Octave VCOs instead of the Volt/Hz found in the Polysix. So, the tuning issues
KLM-367 voltage deviations.
2014-03-01 by <josh.nursing@gmail.com>
My volt readings have been off on KLM-367 for a while: Cutoff VCF CN5-13 gives 7.43V | -7.37V I18-14 gives -3.56V | 3.64V Power supply readings on CN2 pins
KLM-372a UK transformer connections
2014-03-01 by <target9@hotmail.com>
Hi group - could anyone please upload a pic / describe the connections between their UK 240v transformer and the KLM-372a board please? I sourced a UK KLM-372a
Re: [PolySix] Polysix tuning difficulties.
2014-03-01 by Malte Rogacki
Thanks. This is similar to what I did to get the mis-calibrated Polysix back in tune. There are two problems with this though: 1. If the calibration of the
Re: [PolySix] Polysix tuning difficulties.
2014-03-01 by Ben Stuyts
Hi, There is some Trident MkII stuff in the files section in this group. Including some tuning info. Kind regards, Ben
Re: [PolySix] RE: Polysix tuning difficulties.
2014-02-28 by Malte Rogacki
Yes, it s possible that the circuit in the MonoPoly isn t an antilog circuit; but still the calibration involves some scaling. It s apparently not completely
Re: [PolySix] RE: Polysix tuning difficulties.
2014-02-28 by Bob Grieb
Yes, it seems we can get three different static DAC values, but I am not sure that is enough to calibrate the anti-log circuit. I tried the test, and saw
Re: [PolySix] RE: Polysix tuning difficulties.
2014-02-28 by Malte Rogacki
... That s exactly what the MonoPoly does! The Monopoly service manual however gives 0.000V Down Low Adjust 5.250V Normal Mid Adjust 10.583V Up Hi Adjust and
Re: [PolySix] RE: Polysix tuning difficulties.
2014-02-28 by Malte Rogacki
Hi, this reminds me of something. I believe at least the Polysix and the MonoPoly use the same assigner. Polysix 8049C217 Monopoly 8049C217 Same for the old
RE: Clocking he Arpeggiator from MIDI
2014-02-28 by <josh.nursing@gmail.com>
Last demo done with MIDI clock sync ed to the Arp signals sent to the Polysix trigger input. There s some Roland JX-8P near the end, one bum note somewhere
Re: [PolySix] RE: Polysix tuning difficulties.
2014-02-28 by Bob Grieb
Found this on the web: The other test mode is started by jumpering pins DB7 and P17 using a diode (cathode towards DB7) on the 8049 processor on the KLM-366
Re: [PolySix] RE: Polysix tuning difficulties.
2014-02-28 by Bob Grieb
Hi, The voltage at TP2, called Oct/V CV, which seems to be the input to the antilog ckt, is constantly switching between 8 values. Six of them are
RE: [PolySix] RE: Polysix tuning difficulties.
2014-02-28 by Malte Rogacki
Does anyone have access to a complete (!) Trident Mk II service manual? Posting the procedure for the antilog calibration would help tremendously. I have the
RE: [PolySix] RE: Polysix tuning difficulties.
2014-02-28 by <josh.nursing@gmail.com>
Thanks Bob, Malte and Dennis, I will check these and try again. Yash
[PolySix] RE: Polysix tuning difficulties.
2014-02-28 by Malte Rogacki
... I think this is more or less normal behaviour. There are three VR for the calibration of the antilog amp. All three interact somewhat. I do remember that
Re: [PolySix] RE: Polysix tuning difficulties.
2014-02-28 by Dennis Matana
hi, maybe the VR itself isn t what it use to be...maybe corroded....you could unsolder it and measure it through...if the VR isn t stable in its value tuning
Re: [PolySix] Replacement Polysix Knobs?
2014-02-28 by Dennis Matana
Hi, www.syntaur.com has them in the usa and http://synthalog.com/ has them in europe to for 6 euro s a piece. http://soundcloud.com/wifi
RE: Polysix tuning difficulties.
2014-02-28 by <josh.nursing@gmail.com>
Do you think this would this explain why the VR is acting weirdly? Why does the pitch rise after a while after I have turned the VR anti-clockwise? It does
Re: [PolySix] RE: Polysix tuning difficulties.
2014-02-28 by Malte Rogacki
The problem is that there is no guideline in the service manual for calibrating the antilog amp (before the multiplexer). I always wanted to find out about
RE: Replacement Polysix Knobs?
2014-02-28 by <babouche369@hotmail.com>
It could be a good candidate to 3D printing, if someone has the tool to model one knob. I repaired a broken key on a Yamaha QX1 that way. Francois
Re: [PolySix] RE: Polysix tuning difficulties.
2014-02-28 by Bob Grieb
Hi, As you know, there is just the one exponential convertor that is shared by all of the voices. Maybe it s not calibrated correctly? If you
Replacement Polysix Knobs?
2014-02-27 by <pushwithlegs@gmail.com>
Hey all, I m well aware that there is no source for original Korg Polysix knobs (outside of the occasional high priced ebay listing for one or two) thus for my
RE: Polysix tuning difficulties.
2014-02-27 by <josh.nursing@gmail.com>
I have been through the tuning process a couple of times. Both times I hit the upper limit of tuning for most of the voices. One of the VRs when turned (and if
RE: KLM368a diod
2014-02-27 by <josh.nursing@gmail.com>
But I suppose you re not soldering chips one on to another, are you? Yash
Re: [PolySix] I need main processor chip
2014-02-27 by klosmon
Senso at http://www.vintageplanet.nl/ was selling new ones -- check with him to see if they re still available. ~G
Re: [PolySix] I need main processor chip
2014-02-27 by <tomlinson6050@roadrunner.com>
... ============= Hi to all. well I had a brain storm last night and pulled the ic 22 from klm367 board and put it on a breadboard supplied it with power and
I need main processor chip
2014-02-27 by <vaporlock_32578@yahoo.com>
Hi to all. well I had a brain storm last night and pulled the ic 22 from klm367 board and put it on a breadboard supplied it with power and ground and it still
Re: [PolySix] RE: I have my dream synth - help me get it working!
2014-02-25 by Bob Grieb
Could there have been a power supply problem at one time, which was later fixed? I bought an Ensoniq ESQ-1 which had an extra wire added to the pcb. Turns
RE: [PolySix] RE: I have my dream synth - help me get it working!
2014-02-25 by <moondog1311@gmail.com>
NOS, or so I m told. But this was from China, and words are cheap! I had to go to two suppliers, as one had only 2 x SSM2056, but the full set of SSM2044. they
Re: [PolySix] RE: I have my dream synth - help me get it working!
2014-02-25 by <moondog1311@gmail.com>
Looking at the seller, I initially thought it was a distinct possibility. However, in this case it s unlikely. All the VCFs had the same batch number, as did
Re: [PolySix] RE: I have my dream synth - help me get it working!
2014-02-24 by Chromatest J. Pantsmaker
One possibility is that this polysix was used for parts, with the bad parts from other synths swapped into it. This way it would *look* like a complete synth,
RE: [PolySix] RE: I have my dream synth - help me get it working!
2014-02-24 by tim p
Good work! Where did you source the SSM chips from? Are they clones, NOS or pulled? Cheers Tim ________________________________ From:
Re: [PolySix] RE: I have my dream synth - help me get it working!
2014-02-24 by <moondog1311@gmail.com>
Well, it was a surreal experience to collect it. It was sold as just the keybed being defective, which it most certainly was. Whilst checking it out,
Re: [PolySix] RE: KLM368a diod
2014-02-23 by Terje Winther
... Yes, that is the arpeggioator with some voices being modulated by the VCO-to-VCF mod, while others are normal . ... Thanks! Terje Winther
RE: Clocking he Arpeggiator from MIDI
2014-02-23 by <josh.nursing@gmail.com>
Removed the NoteOff de-trigger and replaced it with only triggering/detriggering on Clock and Start. Also coded the Arp pulse to user-settable resolution like