Re: Prophet 600 pointers
2011-08-19 by synthparts
I have a spare working P-600 CPU board if you want it. Doug synthparts.com
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Re: [vintagesynthrepair] Prophet 600 pointers
2011-08-18 by Rish
That figures, for some reason EBay links never transfer over. That was direct from the Ebay mobile share this link setup. So I will have to re-do it but can t
Prophet 600 pointers
2011-08-18 by Scott
Hello groupies, I have a Prophet 600 here for restore after battery leak issue. Any pointers from the techies here?....I ve already jumpered any of the
KORG 3500 Grand piano help
2011-08-18 by Scott
HI folks.. I need a top octave set of keys for this unit. Korg doesnt make them anymore and Ebay has no matches and neither do the Korg Parts suppliers USA.
Arp 2600 case?
2011-08-17 by scituate_mass
Hello. I have an Arp 2600, but it is missing most of its case (it was discarded by the original owner!). I m posting to see if anyone has any case parts that
Re: Arp Omni 1 master oscillator / buffer question.
2011-08-13 by revemosquito
I did not do the PS mod yet -- that s probably a smart place to start. You should be able to test the 50240 by plugging a cable into an amp and simply clamping
Re: [vintagesynthrepair] Arp Omni 1 master oscillator / buffer question.
2011-08-12 by francois
Hi RM I just pick up a non-working Omni 1 as well; so I ll read your bug tracking process with much attention. One thing to be considered is the original power
Arp Omni 1 master oscillator / buffer question.
2011-08-11 by revemosquito
Hey guys! So I picked up an Arp Omni 1 on the cheap some months ago. From the seller s description, it sounded like he was just getting aharmonic noise when
Re: [vintagesynthrepair] Re: roland U20
2011-08-09 by Daniel Forró
Some instruments could do such strange split when Hi Note was set UNDER Lo Note. But this is not U20 case. First I would try patch initialization as described
Re: roland U20
2011-08-09 by narfman96
I don t believe the U-20 is powerful enough to to have key assignments that will exclude certain zones of the keyboard. You might try a removing the battery
Re: [vintagesynthrepair] roland U20
2011-08-09 by colin butterfield
Hi Noel,connected it via midi to my yamaha and the yammy will play the U20 but U20 won t play the Yam,just top & bottom note so seems like the keyboard.All the
Re: [vintagesynthrepair] roland U20
2011-08-08 by Noel Buhagiar
Hi Colin, You could try and connect it to another synth using MIDI IN-OUT and see if it plays ok. If it does, problem could be a bad keyboard and then you’ll
roland U20
2011-08-08 by colinbutterfield@ymail.com
Hi, I have an old Roland U20 keyboard,when powered up,only the bottom and the top keys on the keyboard work,all in between do not produce a note.Everything
Re: [vintagesynthrepair] Help setting power supply trimpots... Thanks !!
2011-08-06 by Malte Rogacki
So far it appears to me as if this is a switching mode power supply and the two trimmers reside in the chopper part of it.
Help setting power supply trimpots... Thanks !!
2011-08-06 by Gil
I was recapping the power supply in my Emulator II and mistakenly fiddled with all four trimpots on the power supply circuit, trying to set the correct
AX80 Akai schematic
2011-08-03 by winking_n_nodding
Anyone have a schematic for the AX80, I at least need the front panel switch and display boards.
Re: Micromoog with a dead oscillator
2011-08-03 by ahassine@nettilinja.fi
Thanks Steve and Terje! It was IC 401 and one failed FET... now it is alive and well again. Well, the S/H doesn´t sample or hold, but I can live with that :)
Re: [vintagesynthrepair] Re: Freeman String Symphonizer Schematics?
2011-08-02 by Paul Krull
You mean a Mellotron or Chamberlin? The different versions of the Freeman were all electronic and no tapes were involved.
Re: Freeman String Symphonizer Schematics?
2011-08-02 by ron60rock
I see that this thread is for the later, electronic, Freeman String Synth. Does anyone have any info on the early Tape unit?
Re: [vintagesynthrepair] Freeman String Symphonizer Schematics?
2011-08-02 by Paul Krull
I just happen to have both the Lowrey H25-3 with a string and brass symphonizer and I just got a stand alone Freeman String Symphonizer. The H25-3 is in
Re: [vintagesynthrepair] Freeman String Symphonizer Schematics?
2011-08-01 by Samuel Adams
A bit of 70s trivia here... Wasn t the Freeman string synthesizer that was used in the older Lowrey organs, which they called their String Symphonizer ?
Re: [vintagesynthrepair] Freeman String Symphonizer Schematics?
2011-08-01 by Malte Rogacki
http://www.cem3374.com/docs/Manuals/Misc/Freeman_String_SM.pdf
Freeman String Symphonizer Schematics?
2011-08-01 by Paul Krull
Can anyone point me to service documentation for the mighty Freeman String Symphonizer? Is the layout of this instrument something that might be familar to
Re: Arp Odyssey: any note leads to a high pitch
2011-08-01 by Boddington
No problem Martin. C8 is still available: http://www.newark.com/jsp/search/productdetail.jsp?sku=66K4992 I haven t had to look for a 6076 but for the 3958 I
Re: Micromoog with a dead oscillator
2011-08-01 by Stephen Jones
Check that your current source (IC304) is OK by seeing if you are getting a CV out from the jack on the back of the synth. Check that R401 isn t open circuit.
Re: Arp Odyssey: any note leads to a high pitch
2011-08-01 by efficientsine
... Sorry to hijack this thread! Is there any easy to find equivalents for: Q7 - 2N6076 - C8 - Polycarb Memorycapacitor - Q8 - IMF3958 - Thanks in advance!
Moog opus 3 gone screwy
2011-07-31 by adhmzaiusz
Hey everyone, I m working on a moog opus 3 right now and for some reason once I put in a few new parts I have a bunch of new problems now, even when I swap out
Re: Micromoog with a dead oscillator
2011-07-31 by ahassine@nettilinja.fi
Thanks Terje!!! Must check that one and the swapping idea is a clever one :) I´ll let you know how it turned out... cheers, Ami
Ensoniq SD-1 ... SYS-EX dump problem...
2011-07-31 by Quazimodo
Hi guys, I am trying to store SYS-EX... patch dumps from my gear onto disk via my Ensoniq SD-1. I ve had no problems with my other synth modules - Oberheim
Re: [vintagesynthrepair] Micromoog with a dead oscillator
2011-07-31 by Terje Winther
Check the CA3080 chips. But beware: sometimes putting in a modern CA3080 will not help: you need a 3080 tested to be within a specific range. Since you mention
Micromoog with a dead oscillator
2011-07-31 by ahassine@nettilinja.fi
Hi All!!! I´m a synthesist from Finland and am a brand new member here. Have a lots of analog and digital gear, mainly from the 70´s and 80´s. So I have to
(no subject)
2011-07-29 by jim finch
Tascam s Parts Dept.Parts @ Teac.com
Tascam TM-D4000 Service Manual / schematics needed !!
2011-07-28 by dfdf
Tascam TM-D4000 Service Manual / schematics needed !! anyone can help ?? greetings
Re: Akai S1100 switching regulator board resistor value needed
2011-07-28 by baumont987
Hi, the service manual may help, but no schematics inside. http://www.box.net/shared/uzx1qmhfot ... schematics diagram?
Akai S1100 switching regulator board resistor value needed
2011-07-28 by SG
Hi vintagesynthrepair fellows. Is there anybody who knows the resistor nr.60 value in the S1100 switching regulator board? Or, at least, the switching reg.
Re: Arp Odyssey: any note leads to a high pitch
2011-07-25 by Boddington
Joy! It was the other 3958! I did a few tests between the two transistors. Sure enough, Q6 was the one shifting the voltage.
Re: [vintagesynthrepair] Re: Odyssey MKII High-Pass filter
2011-07-24 by klosmon
... Again, no offense at stating the obvious. The cap and resistor values are correct (as contained in the statement all three components were replaced with
Re: Odyssey MKII High-Pass filter
2011-07-24 by Boddington
I d start by taking a step back from it then. Firstly, just make sure the resistor and cap values are correct (again, another somewhat obvious statement but
Re: [vintagesynthrepair] Re: Odyssey MKII High-Pass filter
2011-07-24 by klosmon
... It never hurts to state the obvious; in this case, I tried a couple of new 1M audio pots (both tested good with the ohmmeter). This whole thing is
Re: Odyssey MKII High-Pass filter
2011-07-24 by Boddington
At the risk of stating the obvious, is there a chance that that slider is just worn or dirty? Do you a see a consistent change in ohms if you move the slider
Re: Arp Odyssey: any note leads to a high pitch
2011-07-24 by Boddington
... Indeed. This is a new component now. At least that sweep is gone. It does appear to work but I ll need to investigate that possible delay you describe. ...
[vintagesynthrepair] Re: Arp Odyssey: any note leads to a high pitch
2011-07-24 by Malte Rogacki
Ok, this is making things a bit clearer. I m thinking about two scenarios here: 1. Q7 turns off a little too late. This allows C8 to discharge for a very small
Re: Arp Odyssey: any note leads to a high pitch
2011-07-24 by Boddington
Sounds good! ... The semitone change always occurs immediately on release. It is not never gradual. I tried increasing the portamento slider to hear if it
[vintagesynthrepair] Re: Arp Odyssey: any note leads to a high pitch
2011-07-24 by Malte Rogacki
So let s try a different approach here. How exactly does the whole CV memory circuit work? The CV is stored by charging C8. As long as a key is held nothing
Re: Arp Odyssey: any note leads to a high pitch
2011-07-24 by Boddington
Ha! Right of course. I m doing 5 things at once here. I meant to say A2. I ll look there as well.
[vintagesynthrepair] Re: Arp Odyssey: any note leads to a high pitch
2011-07-24 by Malte Rogacki
... Ahem. A1A and A1B are the two halfs of A1. If you replaced A1B you automatically replaced A1A as well.
Re: Arp Odyssey: any note leads to a high pitch
2011-07-24 by Boddington
Just replaced A1B. No difference with regard to the semitone issue I have. I ll move on to A1A and replace that too. No harm in trying.
Re: [vintagesynthrepair] Odyssey MKII High-Pass filter
2011-07-24 by klosmon
... Interesting thought, thanks. I tried it with the lowest possible frequencies, and it s still the same. I m just wondering if this is common with the Mark
Re: [vintagesynthrepair] Odyssey MKII High-Pass filter
2011-07-24 by Malte Rogacki
... I personally find the HPF almost useless; and to make matters worse it even affects the sound slightly when the slider is in the bottom position (you can
Re: [vintagesynthrepair] Arp Odyssey: noise generator
2011-07-24 by JP Szarak
thank you. i ll try to repair it. jp ________________________________ From: Malte Rogacki To: vintagesynthrepair@yahoogroups.com Sent: