Re: [vintagesynthrepair] JX8P +15v and -15v voltages are wrong...
2008-03-03 by Philip
14.4 volts I would say wouldn t cause you much of a problem anyway. It s ususally not critical. If it was the the +5 we are talking about then it would be
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JX8P +15v and -15v voltages are wrong...
2008-03-03 by gil_we
I ve just refurbished my JX8P s power supply unit, replacing all caps. I check the voltages and see +14.40v and -14.40v instead of -15v and +15v. The
Re: Looking for general guidelines for Electrolytic cap replacement.
2008-03-03 by Scott
... them, especially if ... but can t read em.) ... Good caps are ELNA, Illinios, United Chemicon, Mallory, Cornell-Dublier
Re: Looking for general guidelines for Electrolytic cap replacement.
2008-03-02 by arp2600fan
I d say if the caps are over 20 years old, it s time to change them. Oh, and make sure you know which way the caps go before you replace them, especially if
Re: ARP Odyssey sliders
2008-03-02 by arp2600fan
The sliders used in the Ody (and a couple other Arps) were made in Mexico. Once that plant was closed, that was it for those sliders. Shameless plug alert: I
RE: [vintagesynthrepair] Re: siel dk-600
2008-03-02 by Scott Nordlund
I would guess that the CPU isn t doing anything at all. Probably the LFO rate on/off thing is due to some latch somewhere that just comes up in some arbitrary
Re: [vintagesynthrepair] Re: Roland RS-09 annoying noise
2008-03-01 by Philip
yeh its in tune with the sound and moves with tuning knob..it is the last revision with the colored knobs Cheers, phil. ...
Re: siel dk-600
2008-03-01 by cockandswan
Thanks, I ll take a closer look at those ICs shortly. I did some tests and none of the LEDs on the voice board are triggered by the keyboard. Also I noticed
Re: Roland RS-09 annoying noise
2008-03-01 by duncan
is this noise in tune with the other sounds the keyboard makes? you say it is affected by the master volume, I think, but does it alter in pitch with the
Re: Odyssey Repair Tips?
2008-03-01 by balderson04
... Oscillator 1 tracks with low-note priority; Oscillator 2 tracks with high-note priority. That s so that the duophonic feature will follow two notes -- the
Re: [vintagesynthrepair] Re: Odyssey Repair Tips?
2008-03-01 by Philip
Yeh you can do that but they need to be connected in parallel to achive 30pf if thats what you want. For further reading see:
RE: [vintagesynthrepair] siel dk-600
2008-03-01 by Scott Nordlund
I have a broken DK 600 (with Expander) myself that I hopefully will be working on shortly. Get the Opera 6 service manual from Sander Meyer s website- it
Re: Odyssey Repair Tips?
2008-03-01 by cockandswan
i put in those two 15 pf caps and it fixed the cutoff problem. just thought i d let you know! looks like i wont have to adjust the trim pot yet. i just noticed
siel dk-600
2008-03-01 by cockandswan
hey, i just got a siel dk-600 which i am excited about. it s different than the older synths i ve been working on but i thought i d see if anyone else has any
Re: Odyssey Repair Tips?
2008-03-01 by cockandswan
thanks a lot! so i already went out and got two 15 pf caps to replace the 30 pf cap (you can do that right?) do you know if they ll be any negative side
Re: [vintagesynthrepair] Faint audio on Polivoks analogue synth
2008-02-29 by Philip
Probably someting gone bad in the finally pre-amp stage..bad op-amp, transistor, cap..take your pick..Follow the circuit back from the Output jack is what I
[vintagesynthrepair] Re: Odyssey Repair Tips?
2008-02-29 by Malte Rogacki
... http://en.wikipedia.org/wiki/Opamp#Class_A_gain_stage If you re using a modern internally compensated opamp this capacitor might not even be needed;
Faint audio on Polivoks analogue synth
2008-02-29 by jeremyjettsetter
The output on my Polivoks has suddenly become very faint. It did not happen while I was using it, but between uses. It used to be very loud and strong, but
Re: [vintagesynthrepair] Re: Odyssey Repair Tips?
2008-02-29 by Roy J. Tellason
... Just a guess, as I m not even looking at the schematic or anything, but... 30pF? ... -- Member of the toughest, meanest, deadliest, most unrelenting --
Prophet 5 Poly-Mod Freq A - one voice is out of tune...
2008-02-29 by gil_we
I wonder if anyone will be able to help on this one... On my Rev 3.2, if I enable the Poly-Mod section *Freq A* button, notes played by the first voice circuit
Re: Odyssey Repair Tips?
2008-02-29 by cockandswan
update! i didn t even realize it but c2 the capacitor hooked to pin 1 and 8 of the op amp is totally broken. classic newbie move i guess. fix one problem and
Re: Odyssey Repair Tips?
2008-02-29 by cockandswan
one hundred percent man! thank you so much for the help, but now i have created another problem! i was cleaning these super sticky sliders with isopropyl
Re: [vintagesynthrepair] Roland RS-09 annoying noise
2008-02-27 by Philip
No its a sound through the speakers...it reacts to the master tune like a normal sound..I say it sounds like a high pitched organ tone but I tried the Organ
Re: [vintagesynthrepair] Roland RS-09 annoying noise
2008-02-27 by Terje Winther
Is the sound coming through the cable (electronically), or directly off the unit (physical sound)? If it comes right off the unit, it could be a component in
Re: [vintagesynthrepair] Re: How does the Volume pedal work
2008-02-27 by scott frye
I had a Morley Wah/Autowah purchased in the 80 s . It had the CDS photocell and a lamp. Noisefree and smooth. I have now a Morley that USE to be a
Roland RS-09 annoying noise
2008-02-27 by eggwheatis
My Rolans RS-09 makes a high pitched wine like a TV (well maybe not as high as that but similar) when not being played..it s not very loud and it s still
Re: [vintagesynthrepair] Hello +TB303 tactile switches
2008-02-26 by Philip
Hey thanks a lot. A set came up today and I bought them. Phil. ... http://search.ebay.com/_W0QQfrppZ25QQfrtsZ0QQfsooZ1QQfsopZ1QQsassZchipforbrains ...
Re: Re: [vintagesynthrepair] How does the Volume pedal work
2008-02-26 by NicMat
Hi seems to me as a photo type ie an l.d.r and a simple lamp the ones I remember were between 18- 24 volts but other types are/were around I suppose.usually
keyboards and leslie unit for sale trade etc
2008-02-26 by austin.kelly73
Hi Everyone, I have a couple of 49 note keyboards out of an old electone that are spare at the moment if anybody wants to make me an offer. Also I have a
Re: RE: [vintagesynthrepair] How does the Volume pedal work
2008-02-26 by austin-kelly@ntlworld.com
Tim thats great info mate. Just need to wire it up and find out the resistance of it. Is there any easy ways to change the resistance of this ie quick
Re: [vintagesynthrepair] Hello +TB303 tactile switches
2008-02-26 by PeWe
eventually here, - they update their offers regulary and they vari from time to time:
Hello +TB303 tactile switches
2008-02-26 by eggwheatis
Just wanted to introduce myself as a new member to the group..gonna spend a little bit of time reading old posts to see what goes on :o) I have a studio and
Re: How does the Volume pedal work
2008-02-25 by narfman96
Looks just like a Morley. We used to use one back in the 80 s for guitar. It wouldn t load down the input of an Ampeg SJT so the axxe, a Gibson SG, always had
RE: [vintagesynthrepair] How does the Volume pedal work
2008-02-25 by timothy kosiorek
This looks like an optical volume pedal where a usually 8-12 volt lamp shines through a slot that has a varying width that changes as the volume pedal is
Re: Re: [vintagesynthrepair] How does the Volume pedal work
2008-02-25 by austin-kelly@ntlworld.com
Scott thanks for the quick response. Slight problem, the volume pedal in question is not a pot based one it seems to be more of a electro mechanical/inductor
Re: [vintagesynthrepair] Looking for general guidelines for Electrolytic cap replacement.
2008-02-24 by scott frye
If your unit has any background hum, then by all means, replace them. But, if it aint broke, don t fix it. leakage characteristics for caps are all over
Looking for general guidelines for Electrolytic cap replacement.
2008-02-24 by funkymonkeypeter
At what age would you recommend doing a cap swap especially the larger power supply ones in a synth? I m a no-good electronics tech but am accurate with a
Re: [vintagesynthrepair] How does the Volume pedal work
2008-02-23 by scott frye
Hi Aus, being a tech ( by trade ) and a guitar/bass/keyboard player ( as a secret identity) I can say that , depending on the K ohm value of the electone
How does the Volume pedal work
2008-02-23 by austin-kelly@ntlworld.com
Hi guys, Just thought I d ask for some advice. I m a DIY guitarist by trade so to speak and got some Yamaha electone parts including a volume pedal but just
Re: [vintagesynthrepair] Moog source Tuning procedure
2008-02-20 by Mike de Vries
Exactly.. you can get that to work.. just takes time. I m not too worried about tuning offset something that can be fixed with the tuning knob on your synth,
Re: [vintagesynthrepair] Odyssey Repair Tips?
2008-02-19 by Malte Rogacki
... OK, first of all you identify on which board the filter is on and look at the appropriate schematic section. In this particular case it s board C (or C-I
Prophet 5 restoration project
2008-02-19 by gil_we
Hi all, I thought you might be interested to check out my Prophet 5 restoration project, as documented here:
Odyssey Repair Tips?
2008-02-19 by cockandswan
Hey everyone, I m new here and to electronics repair. I am taking some classes so I have access to all kinds of great repair equipment and I think my next
Re: Moog source Tuning procedure
2008-02-19 by duncan
a good place to start is with a voltmeter & either a guitar tuner or a frequency counter. remember in any cv/gate hook-up, keep the contact surfaces of the
Re: [vintagesynthrepair] Moog source Tuning procedure
2008-02-19 by Jez
What do you mean by tuning to CV ? I ve never had 2 CV devices that are in tune with each other. I have to tune (and calibrate) my Midi- CV interface
Moog source Tuning procedure
2008-02-19 by mrjdevries
Hey all, I m having difficulty with tuning this guy to CV. It seems that it s DAC is out as well as it s synth.. ie, it s in tune with itself, but not External
RE: [vintagesynthrepair] ARP Odyssey sliders
2008-02-07 by mtcasino
On their web page in the search box, do a search for “distributors” Hi again, About the ARP Odyssey sliders, I don´t know if this has been
Re: [vintagesynthrepair] Re: ARP Odyssey sliders
2008-02-07 by Roy J. Tellason
... Looks like a lot of interesting junk , at least. :-) -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in
Re: ARP Odyssey sliders
2008-02-07 by Scott
... discussed on this ... out that the original ... least they have them ... finding a retailer for CTS products. ... on... Seems no one has ... possible to
Re: [vintagesynthrepair] ARP Odyssey sliders
2008-02-07 by Roy J. Tellason
... I ve loaded the page, and on the potentiometers page they only show two slidepot series neither of which looks like what we re talking about, but I ve