eml synthesizers

With the exception that the internal calibration has not gone out of wack follow
the procedure below* to tune the to 12 notes per octave.

A.
1. Open the volume for Osc 1 & 2, all controllers off, sustain on
2. turn the Keys/Oct Coarse pot all the way to the left (counter clockwise)to
#12
3. Set Osc 2 in KB1 position.
4. Set Osc 3 in KB 2 position
5. Play the top G on the keyboard and tune the two oscillators in unison
6. Play the bottom F, the two oscillators should still be in tune.(if not see
below)*
7. Now play the bottom F and the first F above (one octave) simultaneously, If
they are not playing exactly 12 notes per octave they will be out of tune.
8. Use the KEYS/OCT FINE pot to adjust the tuning until the beating ceases.
9. To obtain a precise interval jam the lower F with something (cardboard, or
tape it down) to keep the key depressed and simultaneously play the third
octave F, use the KEYS/OCT FINE pot to eliminate any beating.

B.
*
Oscillators 2 and 3 have identical schematics, internal adjustments are
necessary only if
1. You really cannot get even one oscillator to play an octave
2. Or after following the above procedures only Osc 2 plays an octave and
Osc 3 goes out of tune.
Try to adjust only the Linearity pot of OSC 3, follow the schematics or look at
the board and follow the traces, once found mark the pot position.
a. tune both oscillators in unison as in step 5
b. play one octave down, now carefully adjust the internal trim pot for OSC 3
until both Oscillators are in tune.
c. Play the bottom F, they should now still be in tune
d. Now follow the tuning procedure in section A

--- In emlsynth@y..., "Luther Rochester" <lrochester@s...> wrote:
> hi
> well, i've figured out the difference between serial numbers on the 101s. the
layout of board 1 (amps/keyboard voltage) is completely different. on my
earlierl #280 there are 5 trimpots instead of 6 (my instructions are for #300+),
and they are scattered in different places. since the schematics are different, i
have no way of telling what is what,
>
> does ANYONE have calibration instructions for the early serial #s?
schematics? experience? anything? this thing will not play 12 notes/octave so
something needs tweaking. i'll pay for photocopying...
> thanks,
> luther
> lrochester@s...

-Should have read open the volume for OSC 2 and 3

-- In emlsynth@y..., "rob80b" <rob80b@y...> wrote:

> With the exception that the internal calibration has not gone out of wack

follow

> the procedure below* to tune the to 12 notes per octave.
>
> A.
> 1. Open the volume for Osc 2 & 3, all controllers off, sustain on
> 2. turn the Keys/Oct Coarse pot all the way to the left (counter clockwise)to
> #12
> 3. Set Osc 2 in KB1 position.
> 4. Set Osc 3 in KB 2 position
> 5. Play the top G on the keyboard and tune the two oscillators in unison
> 6. Play the bottom F, the two oscillators should still be in tune.(if not see
> below)*
> 7. Now play the bottom F and the first F above (one octave) simultaneously,

If

> they are not playing exactly 12 notes per octave they will be out of tune.
> 8. Use the KEYS/OCT FINE pot to adjust the tuning until the beating

ceases.

> 9. To obtain a precise interval jam the lower F with something (cardboard,

or

> tape it down) to keep the key depressed and simultaneously play the third
> octave F, use the KEYS/OCT FINE pot to eliminate any beating.
>
> B.
> *
> Oscillators 2 and 3 have identical schematics, internal adjustments are
> necessary only if
> 1. You really cannot get even one oscillator to play an octave
> 2. Or after following the above procedures only Osc 2 plays an octave and
> Osc 3 goes out of tune.
> Try to adjust only the Linearity pot of OSC 3, follow the schematics or look

at

> the board and follow the traces, once found mark the pot position.
> a. tune both oscillators in unison as in step 5
> b. play one octave down, now carefully adjust the internal trim pot for OSC

3

> until both Oscillators are in tune.
> c. Play the bottom F, they should now still be in tune
> d. Now follow the tuning procedure in section A
>
> --- In emlsynth@y..., "Luther Rochester" <lrochester@s...> wrote:
> > hi
> > well, i've figured out the difference between serial numbers on the 101s.

the

> layout of board 1 (amps/keyboard voltage) is completely different. on my
> earlierl #280 there are 5 trimpots instead of 6 (my instructions are for #300+

),

> and they are scattered in different places. since the schematics are

different, i

> have no way of telling what is what,
> >
> > does ANYONE have calibration instructions for the early serial #s?
> schematics? experience? anything? this thing will not play 12 notes/octave

so

> something needs tweaking. i'll pay for photocopying...
> > thanks,
> > luther
> > lrochester@s...

With the exception that the internal calibration has not gone out of wack follow
the procedure below* to tune the to 12 notes per octave.

A.
1. Open the volume for Osc 1 & 2, all controllers off, sustain on
2. turn the Keys/Oct Coarse pot all the way to the left (counter clockwise)to
#12
3. Set Osc 2 in KB1 position.
4. Set Osc 3 in KB 2 position
5. Play the top G on the keyboard and tune the two oscillators in unison
6. Play the bottom F, the two oscillators should still be in tune.(if not see
below)*
7. Now play the bottom F and the first F above (one octave) simultaneously, If
they are not playing exactly 12 notes per octave they will be out of tune.
8. Use the KEYS/OCT FINE pot to adjust the tuning until the beating ceases.
9. To obtain a precise interval jam the lower F with something (cardboard, or
tape it down) to keep the key depressed and simultaneously play the third
octave F, use the KEYS/OCT FINE pot to eliminate any beating.

B.
*
Oscillators 2 and 3 have identical schematics, internal adjustments are
necessary only if
1. You really cannot get even one oscillator to play an octave
2. Or after following the above procedures only Osc 2 plays an octave and
Osc 3 goes out of tune.
Try to adjust only the Linearity pot of OSC 3, follow the schematics or look at
the board and follow the traces, once found mark the pot position.
a. tune both oscillators in unison as in step 5
b. play one octave down, now carefully adjust the internal trim pot for OSC 3
until both Oscillators are in tune.
c. Play the bottom F, they should now still be in tune
d. Now follow the tuning procedure in section A

--- In emlsynth@y..., "Luther Rochester" <lrochester@s...> wrote:
> hi
> well, i've figured out the difference between serial numbers on the 101s. the
layout of board 1 (amps/keyboard voltage) is completely different. on my
earlierl #280 there are 5 trimpots instead of 6 (my instructions are for #300+),
and they are scattered in different places. since the schematics are different, i
have no way of telling what is what,
>
> does ANYONE have calibration instructions for the early serial #s?
schematics? experience? anything? this thing will not play 12 notes/octave so
something needs tweaking. i'll pay for photocopying...
> thanks,
> luther
> lrochester@s...

--- In emlsynth@y..., "rob80b" <rob80b@y...> wrote:

> With the exception that the internal calibration has not gone out

of wack follow

> the procedure below* to tune the to 12 notes per octave.
>
> A.
> 1. Open the volume for Osc 1 & 2, all controllers off, sustain on
> 2. turn the Keys/Oct Coarse pot all the way to the left (counter

clockwise)to

> #12

Something important that may have bearing for the original
poster or anyone in the future reading this. "all the way to left" is
not the same thing as setting the knob to the 12 mark . If you set
the knob all the way to the left you'll have the problem the man
who wants to recalibrate the unit will have, the fine knob won't do
the trick.

You do want the course knob somewhere near the 12, not all the
way to the left-- but you may have to tweak it a bit (unless the unit
has been modified or calibrated in a non-standard way).

What the original poster doesn't say if he's overshooting or
undershooting 12 notes per octave. The course knob should be
able to take you from less than 12 notes to more than 12 notes
over the bulk of the range. You want to find the sweet spot that
lets the fine knob get it on the money. Now if the poster has the
knob all the way down (which isn't quite right to start with), but
he's still getting more (not less) than 12 notes, in other words
the octave is too wide, then yes, there is need for a calibration.
With its ability to track a little under and way over there shouldn't
be a need for a user to calibrate it.

I do agree, just borrowed a line from the original manual on
page 38 "To obtain this division of the octave with the synthesizer
keyboard, turn the KEYS/OCTAVE COARSE pot in the
KEYBOARD CONTROL to 12 (fully counter clockwise)."

--- In emlsynth@y..., "hizumi.rm" <hizumi@r...> wrote:
> --- In emlsynth@y..., "rob80b" <rob80b@y...> wrote:
> > With the exception that the internal calibration has not gone
out
> of wack follow
> > the procedure below* to tune the to 12 notes per octave.
> >
> > A.
> > 1. Open the volume for Osc 2 & 3, all controllers off, sustain
on
> > 2. turn the Keys/Oct Coarse pot all the way to the left (counter
> clockwise)to
> > #12
>
> Something important that may have bearing for the original
> poster or anyone in the future reading this. "all the way to left"
is
> not the same thing as setting the knob to the 12 mark . If you
set
> the knob all the way to the left you'll have the problem the man
> who wants to recalibrate the unit will have, the fine knob won't
do
> the trick.
>
> You do want the course knob somewhere near the 12, not all
the
> way to the left-- but you may have to tweak it a bit (unless the
unit
> has been modified or calibrated in a non-standard way).
>
> What the original poster doesn't say if he's overshooting or
> undershooting 12 notes per octave. The course knob should
be
> able to take you from less than 12 notes to more than 12 notes
> over the bulk of the range. You want to find the sweet spot that
> lets the fine knob get it on the money. Now if the poster has the
> knob all the way down (which isn't quite right to start with), but
> he's still getting more (not less) than 12 notes, in other words
> the octave is too wide, then yes, there is need for a calibration.
> With its ability to track a little under and way over there
shouldn't
> be a need for a user to calibrate it.

Excellent point, if Luther can give us more info on his tuning
problem, fellow board members may be able to help.
We are assuming you are using the keyboard and not an
external controller of which I have another fix.

hi guys
thanks for your help here.
ok, i'm using the keyboard, first of all.

the problem is that, no matter WHERE i set the coarse adjustment(less
than 12, more than 12, right on 12 notes per octave) it still will
not play a full octave. it's playing more than 12 tones/octave, so
the internal calibration is obviously off. it will come close--very
close, if i have the coarse all the way counterclockwise and the fine
clockwise.

the oscillator adjustments don't affect this. there should be,
somewhere on board 1, a scale trim pot. if there isn't, i assume i'll
have to make the adjustment with a resistor change or something, but
i don't have any of the correct info since the schematics for board 1
are different between the serial #s.

if you have any more ideas please let me know.
thanks,
luther

--- In emlsynth@y..., "rob80b" <rob80b@y...> wrote:
> Excellent point, if Luther can give us more info on his tuning
> problem, fellow board members may be able to help.
> We are assuming you are using the keyboard and not an
> external controller of which I have another fix.

Luther,
I gather you have the calibration intstructions that are specifically for
after serial #300. The power source schematic is already posted in the
files section.
I think you have all the same paperwork as I do but, just in case, what
follows is a list of the other paperwork I have on the 101.

Here's what I have:

Owner's Manual

A 2-page letter dated 3/14/77 from EML tech John Phelan to "John Hoppe"
about his 101, S/N 294.

Schematics:

Board 1, sheets 1-4 (no dates or titles)

Board 2 , 3 sheets:
J.J.M. 11/5/74 oscillators 2 and 3
J.J.M. 11/7/74 noise source and filter input mixer
J.J.M. 11/15/74 Oscillator 1

Board 3, 3 sheets:
J.J.M. 11/15/74 VCF
J.J.M. 11/20/74 Moduator/Amplitude shaper ckt
J.J.M. 11/21/74 Output mixer.

Osc 4 details and control mode wiring.

If there are specific pages you feel might be relevant, let me know which
ones you would like to see. If you get back to me right away, I will try
to do the scans this weekend.

regards,
Mike B






Mike Berman
digiboy@...

these are all the same things i have.
i appreciate it though.
maybe when the guy with tim's old stock decides to sell it we'll
find out more. i have to imagine tim had that stuff.
thanks,
luther

--- In emlsynth@y..., "Mike B (digiboy)" <digiboy@n...> wrote:
> Luther,
> I gather you have the calibration intstructions that are
specifically for
> after serial #300. The power source schematic is already
posted in the
> files section.
> I think you have all the same paperwork as I do but, just in
case, what
> follows is a list of the other paperwork I have on the 101.
>
> Here's what I have:
>
> Owner's Manual
>
> A 2-page letter dated 3/14/77 from EML tech John Phelan to
"John Hoppe"
> about his 101, S/N 294.
>
> Schematics:
>
> Board 1, sheets 1-4 (no dates or titles)
>
> Board 2 , 3 sheets:
> J.J.M. 11/5/74 oscillators 2 and 3
> J.J.M. 11/7/74 noise source and filter input mixer
> J.J.M. 11/15/74 Oscillator 1
>
> Board 3, 3 sheets:
> J.J.M. 11/15/74 VCF
> J.J.M. 11/20/74 Moduator/Amplitude shaper ckt
> J.J.M. 11/21/74 Output mixer.
>
> Osc 4 details and control mode wiring.
>
> If there are specific pages you feel might be relevant, let me
know which
> ones you would like to see. If you get back to me right away, I
will try
> to do the scans this weekend.
>
> regards,
> Mike B
>
>
>
>
>
>
> Mike Berman
> digiboy@n...

these are already up:

> Board 1, sheet 3

> Board 2 , 3 sheets:
> J.J.M. 11/5/74 oscillators 2 and 3

> J.J.M. 11/15/74 Oscillator 1
>
> Board 3, 3 sheets:
> J.J.M. 11/15/74 VCF one sheet

--



marjan


me : Marjan Urekar
e-mail: urekar.m@...
s-diy : http://surf.to/marjansystems
music : http://go.to/forcemajeure