H910 Dropout

[mg73]

I know people call these unrepairable etc..
But I think I will give it a shoot
also because I love the sound of it.

If i run a 1khz sine thru it,
it sounds fine when manual is  1.00
but when start to  detune same up or down
it´s startin to get short dropouts
with a interval of ≈100-200ms
shorter the more i pitch.

Anyone have similar issue or know how where to start to look.
also a readable schematic/service manual would be very helpful.

 

[kpearsall]

you can still order the service manual direct from Eventide and I recommend it!

the interval is shorter the more you pitch in what direction? up?? is it longer when you pitch down?

 

[mg73]

you can still order the service manual direct from Eventide and I recommend it!

the interval is shorter the more you pitch in what direction? up?? is it longer when you pitch down?

Thanks for you input

Here is an audio sample
https://soundcloud.com/glava73/h910-0-8-1-4

first it´s pitch(manualknob) 0.8% whitenoise and sinewave
then it´s pitch(manualknob)1.4% whitenoise and sinewave
no (anti)feedback or delay activated

Does that sound like a healthy H910 or not?

 

[kpearsall]

No it doesn't!
But again, try pitching it down a bit, then a lot, I'm curious as to if one of the memory chips has gone out or partially gone out.

 

[mg73]

No it doesn't!
But again, try pitching it down a bit, then a lot, I'm curious as to if one of the memory chips has gone out or partially gone out.

Here is a clip
1khz sine stepping down in .10 steps from 1.00 to 0.50 then up from 1.00 to 2.00.
https://soundcloud.com/glava73/eventide-h910-10-step

I agree that a dead memory chip sounds right

,

 

[kpearsall]

actually, bad memory chip probably isn't it. I'm gonna have to refresh my memory of the circuit tonight and look into it.

If a memory chip was bad, I would expect the gaps to get longer lasting and farther apart as you pitched down. The way yours is, it's the extent of pitching in either direction that is causing the glitch. I'm sure that will help narrow it down. Have you ordered the service manual from Eventide yet?

 

[mg73]

actually, bad memory chip probably isn't it. I'm gonna have to refresh my memory of the circuit tonight and look into it.

If a memory chip was bad, I would expect the gaps to get longer lasting and farther apart as you pitched down. The way yours is, it's the extent of pitching in either direction that is causing the glitch. I'm sure that will help narrow it down. Have you ordered the service manual from Eventide yet?

Thanks for the help much appreciated!
I will check with Eventide for manual

 

[kpearsall]

Sorry I've not gotten back to you, I've been really overwhelmed. I'll bring the manual to work with me tomorrow and look it over in my free time.