Hi,
I a Voyager electric blue and I have been tuning OSC1 because its out of tune in octaves. One semitone / octave. Im able to tune all low E´s ( 32´ 16´ 8´ 4´ 2´ 1´) but if I hit middle E or high E, its out of tune. If I try to adjust RT2 for range, the pot will run out of adjustment before Im able to reach the high E. So far no help from MOOG support… After 6 months I would love to have that OSC back in business, so any ideas folks?
I followed these instructions from “gearslutz”-forum:
"Voyager Tuning Info, Julian Worskett May 31st 2011
30 mins warm up then set master tune to centre position Check PSU output is 15.00Vdc on +15V bus In Edit menu select “Init. Defaults”
Set Pitch Bend amount to Off on both + and - directions.
DONT touch VCO2/3 tuning controls from now on – they have been set at centre by “init default” command.
OSC1
PLAY LOW E at 8’ (8 ft DEFAULT from INIT PARAMETERS) ADJUST RT2 RANGE SET OCTAVE TO 2’
ADJUST RT1 SCALE
BACK TO 8’
ADJUST RT2 RANGE
ADJUST RP11 FOR 1’ OCTAVE
Set octave back to 8’
PLAY HIGH E
ADJUST RP9 KBTRACK
PLAY LOW E, readjust RT2 RANGE if necessary
OSC2
PLAY LOW E at 8’
ADJUST RT4 RANGE
SET OCTAVE TO 2’
ADJUST RT3 SCALE
BACK TO 8’
ADJUST RT4 RANGE
ADJUST RP20 FOR 1’ OCTAVE
Set octave back to 8’
PLAY HIGH E
ADJUST RP21 KBTRACK
PLAY LOW E, readjust RT4 RANGE if necessary
OSC3
PLAY LOW E at 8’
ADJUST RT6 RANGE
SET OCTAVE TO 2’
ADJUST RT5 SCALE
BACK TO 8’
ADJUST RT6 RANGE
ADJUST RP14 FOR 1’ OCTAVE
Set octave back to 8’
PLAY HIGH E
ADJUST RP16 KBTRACK
PLAY LOW E, readjust RT6 RANGE if necessary
RTs are multiturn, RPs are single turn pots Bottom E on 8ft = 164.8 Hz Top E on 8ft = 659.2 Hz"
Moog had the worst support ever. Luckily I finally found a local Roland analog synth guru via local Moog importer and he just changed the trim pot for a wider range: success. After all, how easy fix was that?
Scaling on most osc is a back and forth affair, not a turn a pot once to range. Play the initial note and tune it with tuning pot. Play the ocatves above and adjust scaling pot in the direction needed. Go back to initial note and readjust tuning with tuning pot. Play the octaves above and turn scaling in the direction needed. Keep doing this until it is scaled.
Yep, it is tedious and even counter intuitive. But that is how I was taught on my modular osc.
Yeah. When I bought an MFB Microzwerg, the scaling of both oscillators was way off. I mailed MFB and Manfred himself replied promptly, outlining the procedure, which was basically what you describe. Tedious, but I did get it right, eventually. And not as tedious as when I decided to tune up an old Acetone organ’s twelve oscillators…
—edit—
I just realized that this is basically how you intonate a guitar or bass too, though your ‘scaling pots’ are the string length adjustment screws on the bridge saddle. Makes sense when you think of it.
I have tuned oscillators before and this was not a new situation for me. I did just like you described and eved tried to tune the OSC one octave up or down to check if there would be a change in the scaling range. I even tried if the OCS’s are affecting to each other. When I could get it in tune, I took it to a local model-D-old-school wizard. He confirmed me that the pot range really was not sufficient. He got no support from Moog. I took the Moog for the official importer and their outsourced tech guy changed the pot, without any support.
Does the trim pot change affect to the OSC temp control?
As if Bob and the Moog engineers would have made an error in their calculations of the values of trimpots when designing the analog board ? Common !
Of course not. “Common !”. I just want to know if the repair was ok and would love to know what the **** caused it and if there is a misfunctioning component that has been the main problem. And what comes to support, yes, Im kind of pissed because there aint no support, but thats just business. Thanks for your “humble” opinion
Saying that “Moog has the worst support ever” vs. “I didn’t get the support I wanted” is the difference between a “sniveling dork” ™ and a man who is willing to own up to the reality of the problem at hand.
You want help on this forum? Try toning down your lower nature and speak like you’re among friends. Otherwise it might not work in your favour.
The rest of us here (at least an overwhelming majority) have experienced Moog support to be among the best in the business. That’s not an easy thing to accomplish in this day and age.
1.) Set the OSCILLATOR 1 OCTAVE Switch to 8’. Depress and release the lowest E key. Adjust Oscillator 1 Range (RT2) so the pitch is exactly the E below middle C (E3) (that is, the tuner pattern stands still).
2.) Turn the OSCILLATOR 1 OCTAVE switch to 32’. Adjust Oscillator 1 Scale (RT1) so the pitch is exactly three E’s below middle C (E1).
3.) Repeat Steps (1) and (2) once or twice.
4.) Turn the OSCILLATOR 1 OCTAVE switch to 1’. Adjust Oscillator 1 Hi (RP11) so the pitch is exactly three E’s above middle C (E7).
5.) Repeat steps (1), (2), and (4) once or twice.
6.) Set the OSCILLATOR 1 OCTAVE switch to 8’. Reset Oscillator 1 Range so the pitch is exactly the E below middle C.
7.) Depress the highest E on the keyboard. Adjust Oscillator 1 Kbd (RP9) so the pitch is exactly two E’s above middle C (E5).
8.) Look at the output waveform on the scope. Also, listen to it carefully. Set Oscillator 1 Wave (RP13) so the waveform has the smallest glitch at the top, and the waveform sounds least buzzy.
Its that time of the month/year again where I need to tune my EB. In the past I used the procedure mentioned in the beginning of this thread but the tracking would not stay consistent for long.
I will tune it this weekend using your instructions.
Apparently this tuning method wasnt the problem. My tech has been using other guidelines for tuning and those were correct. I used a paper version for the process and it was ok as well. The Moog tunes just fine and everything else seems to work despite that the range trim pot ran out of adjustment before the high E was reached. All the other OSC’s tuned just fine. Weird problem. I hope that this change of pots and the resistor is a permanent fix.
