All about the Roland Jupiter-series

-----Original Message-----
From: Tom Moravansky [mailto:tom@...]
Sent: Monday, March 18, 2002 4:09 PM
To: vintagesynthrepair@yahoogroups.com
Subject: [vintagesynthrepair] oscillator calibration (general)


Normally I calibrate a synth using my Boss TU-12H tuner which works
over a wide range and is very portable.  However, this weekend I
was calibrating a Jupiter-8 and discovered something.  After going through
it with the tuner, I powered it up and started playing some widely spaced
chords to hear the oscillator interaction.  The beating was very unpleasant.

I decided to use my scope and tune by the Lissijous (sp?) method.  I
created a 220, 440, 880, and 1760 sine waves in Cool Edit and ran the
output into one scope trace and the synth output into the other. 

The end result was that I tuned the synth faster and it sounded better
using that method.  Since the JP-8 is not necessarily the most precise
instrument across all the octaves, there was still some beating, but it
was more 'musical' sounding.  Unless I started replacing components, I
don't think I can eliminate all beating across 16 VCOs across 8 octaves.

What do you guys use for tuning?  Anyone using a strobe tuner?  How does
that compare for 'real world' sound and speed?
-- 

_______________________________________________________________________
Tom Moravansky                                    tom@...


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