Alpha Juno 2
2011-06-14 by Evan Dembskey
Hi all, I just picked up a AJ2 for a good price. It had some mechanical problem which I fixed. However, it has one problem that I am not sure how to approach.
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Page 43 of 155 · 7723 messages matched
Re: [vintagesynthrepair] Oberheim DX/DMX switches
2011-06-12 by Mike
I believe the OP is referring to the drum switches. Sent from my Apple ][e
Re: [vintagesynthrepair] Oberheim DX/DMX switches
2011-06-10 by Mike
Forat sells part of the switches, but from memory, only the switch base. Not the cap. These are getting hard to track down. Also used in sequential Tom,
Re: [vintagesynthrepair] Oberheim DX/DMX switches
2011-06-10 by Malte Rogacki
... Thanks, but the ones in the DX/DMX are larger. No Marquardt switches would fit here directly. http://www.electrongate.com/dmxfiles/switch_cleaning.html
Re: [vintagesynthrepair] Oberheim DX/DMX switches
2011-06-10 by PeWe
I cannot remember how these switches looked like, but possibly these are identical to the switches used in the Xpander and DPX-1. Originally these were
Re: Maestro Rhythm Jester - Conversion to UK power supply?
2011-06-10 by nervejam
Hi Paul, Thanks for the offer, but I have a step-down transformer on the way from connevans for 10gbp inc p&p. Power it up, and get a meter on it, no bother.
Oberheim DX/DMX switches
2011-06-10 by Malte Rogacki
Hello everyone; I recently got an Oberheim DX that was obviously partly cannibalized. Surprisingly, most of the functions still work. However it lacks a few of
Re: Maestro Rhythm Jester - Conversion to UK power supply?
2011-06-10 by Paul
Hi Paul, Where abouts are you in the UK, I might be able to help if you are unsure of opening it up and having a look. I have a Variac a variable transformer
Re: Eventide Harmonizer H949
2011-06-10 by Susie
I bid on a Farfisa compact last week (and lost). Now if only I d got that I could have put my flares on and really celebrated Syd.
Re: Eventide Harmonizer H949
2011-06-09 by duncan
nice work, & thanks for the update. see if you can get the binson sorted in time for the 5th anniversary of syd s death next month, & then play some slide
Re: Eventide Harmonizer H949
2011-06-09 by Susie
I think I said I d put my money on a duff fifo chip - I win! I d lost the middle 4 bits of the 11 bit word, which I realised last night when I was looking at
Re: Looking for Mini-Moog tech...
2011-06-09 by Doug
I might be able to help out. Mini s are a bit of a specialty with me, but I m in Southern NJ. www.steamsynth.com www.dougslocum.com Doug
Re: Looking for Mini-Moog tech...
2011-06-08 by Scott
Re: Eventide Harmonizer H949
2011-06-08 by Susie
I need to give this a rethink as I m starting to understand a bit more on how the fifo array works, and I think the noise I m seeing is of a low amplitude and
Re: [vintagesynthrepair] Re: Looking for Mini-Moog tech...
2011-06-07 by Samuel Adams
Thanks for the suggestions however and unfortunately I don t own a meter or other electronics equipment nor am I that knowledgeable in electronics. All I can
Re: Eventide Harmonizer H949
2011-06-07 by Susie
hmm... The behaviour tonight was somewhat different. The noise no longer disappears, but does go up in pitch. I traced the signals coming in to the fifo array
Re: Looking for Mini-Moog tech...
2011-06-07 by Nick
There s a constant current source in series with the keyboard resistor chain .. if that circuit has failed that would do the trick. Actually, so would a broken
Re: Eventide Harmonizer H949
2011-06-07 by duncan
does the noise go up in pitch as it disappears? sounds to me like a device that works this way would have tracking filters to remove clock noise from its
Re: Eventide Harmonizer H949
2011-06-07 by Nick
The 40105 is four bits wide .. assuming that the data path is 12 bit for a reasonable sample quality, you have enough FIFO there for two banks. It might be
Eventide Harmonizer H949
2011-06-07 by Susie
I have a Harmonizer displaying a symptom which I reckon is specific enough to diagnose the component failing, so here goes. The Harmonizer model in question
Cavendish 902V: any info please
2011-06-06 by Andrew g Snaden
Hello folks, this my first post. I have acquired this beast sold by Boosey and Hawkes from the 1970s from Freecycle but it needs attention. Some ICs are U/S,
Re: [vintagesynthrepair] Re: Looking for Mini-Moog tech...
2011-06-06 by Roger J
Look at the key contacts(under the keybed) and check for a contact that is now on the wrong side of the contact bus. R ________________________________ From:
Re: Looking for Mini-Moog tech...
2011-06-06 by John
As an ARP guy, it sound like it s in the CV circuit. Could be just a short but an IC or transistor coud be causing it to stay on the same pitch.
Re: Maestro Rhythm Jester - Conversion to UK power supply?
2011-06-04 by nervejam
Maplins - £24.99 for a 45W adapter! :(
Re: Maestro Rhythm Jester - Conversion to UK power supply?
2011-06-04 by nervejam
I d thought of that, but I was trying to make a clean job of it. Hmm. If I could borrow a converter, I could measure the voltage output and find one that had
RE: [vintagesynthrepair] Maestro Rhythm Jester - Conversion to UK power supply?
2011-06-04 by Brian
Your simplest bet is to buy a small auto-transformer that will convert the 230V UK mains to 117V Canadian mains, readily available from maplin, TS Components
Re: [vintagesynthrepair] Looking for Mini-Moog tech...
2011-06-04 by Samuel Adams
Hi Tim, Thanks for the suggestion, I ll take a look however it s not a specific note that s stuck on . The keyboard works as it should -- note on / note off
RE: [vintagesynthrepair] Looking for Mini-Moog tech...
2011-06-04 by timothy kosiorek
Hello:have you looked at the keyswitch contact under the note that is stuck playing,it might be a simple repair just to align a flipped or bent keyswitch
[vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-04 by Malte Rogacki
From everything I ve seen so far this is a single transformer with two separate secondaries. No need for two transformers; a single torroidal one would do the
Re: Crumart Trilogy replacement power transformer
2011-06-04 by Boddington
The upper most section of green jumpers on the left of the board are all ground connections, as are pin 11 & 12 on the second rail of jumpers. What I don t yet
Sequential Circuits 700 Synth-Programmer
2011-06-04 by Samuel Adams
Hi - Anyone know what a Sequential Circuits 700 Synth-Programmer is worth in non-working, slightly below average condition? It was working fine a few years
Looking for Mini-Moog tech...
2011-06-04 by Samuel Adams
Looking for a Mini-Moog tech somewhere within 50 or so miles from the Glens Falls, NY area. Anybody nearby that repairs Mini-Moogs? Symptoms, everything but
Maestro Rhythm Jester - Conversion to UK power supply?
2011-06-04 by nervejam
I have a Maestro Rhythm Jester (RJ-1) drum machine, which I bought years ago from Canada (I think). It has Canadian power input (117v, 50/60 Hz). Says 3W on
RE: [vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-03 by Brian
Having been in the service industry as both a service engineer, test engineer and design engineer since 1956 I can assure you that many circuits use commoned
RE: [vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-03 by Malte Rogacki
... I believe it pretty much is the whole story. ... http://www.pmerecords.com/Keyboards/CrumarTrilogy/CrumarTrilogy11.jpg
RE: [vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-03 by Brian
What you are saying is of course correct, unfortunately that is not the whole story is it? We don t have the PCB or the transformer here so we cannot assume
RE: [vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-03 by Malte Rogacki
... No, they re not. Just look at the PCB. It s the last page of the manual.
RE: [vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-03 by Brian
I suggest that you look at the schematic again - together with the page on which the various circuit designations are quoted - you will see that the ends of
RE: [vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-03 by Malte Rogacki
... I d go with two separate 15 volts windings! Contrary to most (but not all) designs I ve seen this power supply has separate bridge rectifiers for the
RE: [vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-03 by Brian
OK I ve studied the schematic and agree that only a single centre tapped secondary winding is required. As per your other reply a 15V - 0 - 15V secondary will
[vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-02 by Malte Rogacki
It s pretty simple: According to the schematic you need +21 volts (unregulated) in front of the 15 volts regulator (after rectification and filtering). This
Re: Crumart Trilogy replacement power transformer
2011-06-02 by Boddington
I m basing it entirely on the schematic. I don t the believe that the windings are 12 & 15 as the message above suggests. Those are only the outputs after the
Re: [vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-02 by HAL9000
I agree with you this time although I ve met with many transformers that had/have a thermal fuse. It could be cost or otherwise like you said but cost is also
RE: [vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-02 by Brian
My background on transformers is that I used to design them and I can assure you that at no time did I ever have the need to put a thermal fuse inside of them.
RE: [vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-02 by Brian
Have you looked at the schematic? If not you are fighting in the dark! You need to know precisely what voltages are required. You make the comment from
Re: Crumart Trilogy replacement power transformer
2011-06-01 by Boddington
See it can be rocket science! :) I ll check the PSU board once it s up and running again for sure. But to be clear: even IT wasn t connected. Just a cable,
Re: [vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-01 by HAL9000
Sorry I disagree, I have met with many with thermal fuses if not to say most of them. One I m thinking of at the moment was of a high end Technics Arranger
RE: [vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-01 by Brian
This is misleading very few transformers have built in thermal fuses! Regards Brian G3OYU From: vintagesynthrepair@yahoogroups.com
Re: [vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-01 by HAL9000
I check the transformer s primary using a self-made (lopt) inductance tester running at 19KHz. The primary could have shorted turns due to overheating etc.,
RE: [vintagesynthrepair] Re: Crumart Trilogy replacement power transformer
2011-06-01 by Brian
The secondary of the transformer should show low ohms not high. A 15V winding could well have impedance of an ohm or two if not less. What you seem to be