Eventide H910 help

Archived from groups: rec.audio.pro (More info?)

Hey there--

Out 2 on a 910 is delay only--no pitch shift.

The other symptoms you describe suggest to me that the unit is mildly
ill--probably just out of alignment. I don't know the procedure well
enough to describe it, but I do know that it involves a scope, signal
generator and voltmeter. Have you tried contacting Eventide?

--gmr

Archived from groups: rec.audio.pro (More info?)

<sam_lloyd18@yahoo.com> wrote in message news:1111690748.713525.123860@f14g2000cwb.googlegroups.com...
> Thanks for the comments, Gordon! I have considered buying the
> manual/schematics from Eventide, but at $25 I thought I'd see how far
> out of whack this thing is before plunking down the cash.
>
> Even if it is out of alignment it's plenty useful as is, but I want to
> bring back to spec. I've got the test equipment(scope, meters, sig gen,
> freq counter, etc), and I've made some adjustments, but the Ref A pot
> (internal control on PCB) seems to have no discernible affect, and the
> "thumping" I mentioned earlier doesn't seem right. Maybe I should just
> shell out the $25 and be done with it.
>
> Any thoughts on the "thump"?
>
> Thanks,
> Sam
>
>
>
>
>
> Gordon Rice wrote:
> > Hey there--
> >
> > Out 2 on a 910 is delay only--no pitch shift.
> >
> > The other symptoms you describe suggest to me that the unit is mildly
> > ill--probably just out of alignment. I don't know the procedure well
> > enough to describe it, but I do know that it involves a scope, signal
> > generator and voltmeter. Have you tried contacting Eventide?
> >
> > --gmr


I'd shell out the $25 if you can't find it on line. IIRC, this is essentially
an 'in-line' MONO unit, so one output is the dry signal and the other is
the processed signal.

DM

Archived from groups: rec.audio.pro (More info?)

was it not that the second out put was optional?

you would have to install an extra board?

my memory fails ( it's been 20 years i sold mine)

best
at

"David Morgan (MAMS)" <mams@NOSPAm-a-m-s.com> wrote in message
news:WQE0e.13210$wL6.1369@trnddc03...
>
> <sam_lloyd18@yahoo.com> wrote in message
news:1111690748.713525.123860@f14g2000cwb.googlegroups.com...
> > Thanks for the comments, Gordon! I have considered buying the
> > manual/schematics from Eventide, but at $25 I thought I'd see how
far
> > out of whack this thing is before plunking down the cash.
> >
> > Even if it is out of alignment it's plenty useful as is, but I
want to
> > bring back to spec. I've got the test equipment(scope, meters, sig
gen,
> > freq counter, etc), and I've made some adjustments, but the Ref A
pot
> > (internal control on PCB) seems to have no discernible affect, and
the
> > "thumping" I mentioned earlier doesn't seem right. Maybe I should
just
> > shell out the $25 and be done with it.
> >
> > Any thoughts on the "thump"?
> >
> > Thanks,
> > Sam
> >
> >
> >
> >
> >
> > Gordon Rice wrote:
> > > Hey there--
> > >
> > > Out 2 on a 910 is delay only--no pitch shift.
> > >
> > > The other symptoms you describe suggest to me that the unit is
mildly
> > > ill--probably just out of alignment. I don't know the procedure
well
> > > enough to describe it, but I do know that it involves a scope,
signal
> > > generator and voltmeter. Have you tried contacting Eventide?
> > >
> > > --gmr
>
>
> I'd shell out the $25 if you can't find it on line. IIRC, this is
essentially
> an 'in-line' MONO unit, so one output is the dry signal and the
other is
> the processed signal.
>
> DM
>
>
>
>
>
>
>

Archived from groups: rec.audio.pro (More info?)

In article <Fletcher.1mf0po@audiobanter.com> Fletcher.1mf0po@audiobanter.com writes:

> sam_lloyd18@yahoo.com Wrote:

> > Also, I can't detect any discernible delay when selecting the various
> > delay settings on Out 2.
>
> You should be getting a delay vs. the dry signal... if not something
> might indeed be broken

Given that Output 2 is delay only (not delay+input) unless you (Sam)
monitored both the input and Out 2, you wouldn't be able to tell that
the output was delayed.

> > Oh, and the Out 1 pitch-shifted signal emits a periodic "pop" at a rate
> > proportional to the amount of pitch-shift dialed in. Is this normal?
>
> Yep... that's quite normal.

Not good, but normal. <g>



--
I'm really Mike Rivers (mrivers@d-and-d.com)
However, until the spam goes away or Hell freezes over,
lots of IP addresses are blocked from this system. If
you e-mail me and it bounces, use your secret decoder ring
and reach me here: double-m-eleven-double-zero at yahoo

Archived from groups: rec.audio.pro (More info?)

Mike,

I wasn't monitoring both channels at once, so it's possible that it's
working right and I'm just not hearing it. I'll stick a scope probe
aross each channel and check if I can SEE it since I don't have a mixer
or stereo amp in my workshop right now.

The thing that made me think it wasn't delaying is that when I ran a
guitar through it (yes, I DO keep a guitar in the workshop) I couldn't
detect a delay between the time I plucked the string and the time it
sounded. Also, the FB control has no effect in the Delay Only mode.

Someone was nice enough to email me a schematic, but in the short time
I've spent perusing it I haven't been able to determine whether the
behavior I've described is all normal and expected. This schem doesn't
show the Output 2 compandor board either... weird.

Sam

Archived from groups: rec.audio.pro (More info?)

sam_lloyd18@yahoo.com Wrote:
> I believe the Output 2 delay may be
> on the fritz, because I can't HEAR a delay. I should be able to easily
> hear the 82.5 mS max delay of Out 2, but I don't hear any change.

I'll bet you even money that if you check out the output of 2 in
relation to the direct signal you'll hear a delay. As delays the
things weren't too bad in the clarity department [the homitaztion of de
evenrude 910 de-flatter definitely had room for improvement... but the
delay was always pretty much the real deal].

Reference return to source and I'm almost positive you'll hear the
thing working... if not, then chances are pretty damn good it's
broken.

Peace


--
Fletcher

Archived from groups: rec.audio.pro (More info?)

Fletcher wrote:

> sam_lloyd18@yahoo.com Wrote:
>
>>I believe the Output 2 delay may be
>>on the fritz, because I can't HEAR a delay. I should be able to easily
>>hear the 82.5 mS max delay of Out 2, but I don't hear any change.
>
>
> I'll bet you even money that if you check out the output of 2 in
> relation to the direct signal you'll hear a delay. As delays the
> things weren't too bad in the clarity department [the homitaztion of de
> evenrude 910 de-flatter definitely had room for improvement... but the
> delay was always pretty much the real deal].

But with the FB up this would be a great piece for all those Kraftwerk
cover bands out there.

> Reference return to source and I'm almost positive you'll hear the
> thing working... if not, then chances are pretty damn good it's
> broken.
>
> Peace
>


Yeah, I passively mixed the 2 outs together with a couple of resistors
just to see if I could hear the delay, and I could. I didn't have the
direct signal mixed in, but I could hear the delay of Out2 relative to Out1.

Sam

Archived from groups: rec.audio.pro (More info?)

From memory, one output is delay only, the other is delay plus pitch shift.
You can press multiple delay time buttons in at the same time for a delay
time of the sum of the depressed buttons.



Gareth.


<sam_lloyd18@yahoo.com> wrote in message
news:1111667722.806422.128060@z14g2000cwz.googlegroups.com...
>I just picked up an H910 without a user manual, so I'm trying to make
> sense of this thing. Is it normal that the Output 2 signal NOT be pitch
> shifted? If the Feedback control is fully CCW I get no effected sound
> from Out 2. But, if I turn up the Feedback control, Out 2 outputs a
> pitch-shifted "climbing" signal.
>
> Also, I can't detect any discernible delay when selecting the various
> delay settings on Out 2.
>
> Oh, and the Out 1 pitch-shifted signal emits a periodic "pop" at a rate
> proportional to the amount of pitch-shift dialed in. Is this normal?
>
> FWIW: The PS rails are all the correct voltage, and have practically no
> ripple (i.e., less than a few millivolts). And the Ref A control has no
> effect on anything that I can hear.
>
> Thanks,
> Sam
>

Archived from groups: rec.audio.pro (More info?)

In article <424A1F55.6090203@verizon.net> s_lloyd@verizon.net writes:

> Do you know how the
> Anti-Feedback works? Is it supposed to shift the pitch only in the
> presence of feedback? As far as I can tell, it only seems to work the
> same as the Manual mode, except that it has a very limited range of
> around 80-100% instead of 50 to 200% in manual.

Phil Allison is the authority on this. It doesn't sense feedback, it
works full time, shifting the **frequency** of the input (which
includes feedback howling). Since the next turn around the system, the
feedback is at a different frequency than that of the physical
resonance that started it, it may be far off the resonant curve so
that it's no longer boosted enough to continue the feedback. And if it
doesn't work the first time around, maybe the second time around will
get it off the peak of the curve. Or the third,

It was an idea that works in theory but there are some limitations in
practice that rendered it not the magic, universal solution to quell
feedback.


--
I'm really Mike Rivers (mrivers@d-and-d.com)
However, until the spam goes away or Hell freezes over,
lots of IP addresses are blocked from this system. If
you e-mail me and it bounces, use your secret decoder ring
and reach me here: double-m-eleven-double-zero at yahoo

Archived from groups: rec.audio.pro (More info?)

In article <_hI2e.25910$wL6.4990@trnddc03> s_lloyd@verizon.net writes:

> My intitial assumption was that it is supposed to work as you've
> described. However, since mine doesn't automatically vary the pitch when
> in A-F mode I wondered if maybe it only varied pitch when feedback
> occured... I thought maybe it only kicked in when the comparator circuit
> for the input level crossed its threshold.

That would be interesting, but I suspect rather unnerving to listen
to.

> But, if I understand correctly, it sounds like it's essentially a very
> slow flanger or chorus... If this is the case, then I probably have a
> dead LFO.

No, it wouldn't be like a flanger or chorus. Those vary the pitch as a
function of time. The feedback suppressor shifts the frequency by a
fixed amount. For instance if 500 Hz was going in, 510 Hz would come
out. If 2500 Hz went in, 2510 Hz would come out. It's nothing that you
can hear by listening only to the output, you need to hear (or
measure) the input and the output.

If you have an oscilloscope with an external horizontal input, you
could connect the vertical input to the input source and the
horizontal input to the "anti-feedback" output. You'd see a Lissaujous
pattern that showed a phase shift that varied with the input
frequency.


--
I'm really Mike Rivers (mrivers@d-and-d.com)
However, until the spam goes away or Hell freezes over,
lots of IP addresses are blocked from this system. If
you e-mail me and it bounces, use your secret decoder ring
and reach me here: double-m-eleven-double-zero at yahoo

Archived from groups: rec.audio.pro (More info?)

In article <1112282601.649984.258140@g14g2000cwa.googlegroups.com> sam_lloyd18@yahoo.com writes:

> Yes, that's what I assumed it was supposed to do. I assumed it was
> intended to create a "moving target" to throw the feedback off its path
> by incorporating an extremely slow LFO so that the change wouldn't be
> audible, or at least not *easily* audible.

Nope, not necessary. You only need to shift the frequency out of the
frequency range where the system gain (which includes the air) exceeds
unity.

> I hope I'm not missing something that SHOULD be glaringly obvious, but
> how does this differ from the regular pitch-shift mode (other than the
> A-F mode has a relatively limited range of pitch-shift)?

There was a lengthly discussion here several months ago (ostensibly in
regard to frequency-shifting feedback suppression) which drifted to
the correct definitions of frequency (a physical characteristic) and
pitch (a musical parameter) and how they were not the same.



--
I'm really Mike Rivers (mrivers@d-and-d.com)
However, until the spam goes away or Hell freezes over,
lots of IP addresses are blocked from this system. If
you e-mail me and it bounces, use your secret decoder ring
and reach me here: double-m-eleven-double-zero at yahoo