Need circuit diagram for Eventide Clockworks Instant Phaser please ?

[Rob Flinn]

As it says in the title.  Sick one on the bench here.

Thanks

 

[Walrus]

Maybe a little more information Rob!  ;D

 

[mjrippe]

What Eventide device is it?

 

[pvision]

I'm guessing an H910 Harmonizer

Nick Froome

 

[pucho812]

Maybe it’s the phaser or Omnipressor?

 

[Rob Flinn]

It's not a 910 or an omnipressor.

It's a clockworks, which is a phaser.

 

[Brian Roth]

This one?

https://www.eventideaudio.com/products/legacy/ps-101-instant-phaser

Bri

 

[mjrippe]

It's not a 910 or an omnipressor.

It's a clockworks, which is a phaser.

Eventide Clockworks was the original name of the company.  The piece of gear is called the Instant Phaser.  There was also an Instant Flanger.

Live sound guys would often take a black marker and color over the "ti" in Eventide and the "l" in Clockworks.  I'm glad yours was not one of those!

 

[Rob Flinn]

This one?

https://www.eventideaudio.com/products/legacy/ps-101-instant-phaser

Bri

Yes, that's the one !

 

[Walrus]

On the delay the T DE of Eventide, the IT L of Digital, and de of Delay was the favourite letters to sharpie out! 

 

[Walrus]

Found this......

 

[JohnRoberts]

This one?

https://www.eventideaudio.com/products/legacy/ps-101-instant-phaser

Bri

Nice... It warms my heart for them to properly describe the difference between "phasing" and (reel) "Flanging".

Back in the 70s I designed the Loft 440/450 studio delay line-flanger (using BBD delay).

======

Sounds like the Phasor uses a bunch of voltage controlled (?) phase shift networks.

Look for one or more squirrelly old JFETs in the voltage controlled phase shift sections.

JR

 

[Rob Flinn]

Sounds like the Phasor uses a bunch of voltage controlled (?) phase shift networks.

Look for one or more squirrelly old JFETs in the voltage controlled phase shift sections.

JR

I think your probably right because I did find a dead E112.  The question if I haven't got one amongst my bunch of old semiconductors can I sub in a JE112 ?

 

[Rob Flinn]

Found this......

Thanks for that Kevin.  I think it is probably something like that but it has far less i'c's & is simpler.  The i.c's are different.  This box has LM301 & U741's.  The 741's are used in conjunction with E112 Jfets. There are no 4066 or TL084

 

[JohnRoberts]

I think your probably right because I did find a dead E112.  The question if I haven't got one amongst my bunch of old semiconductors can I sub in a JE112 ?

If they are trying to use the JFETs for continuous phase shift variation, I suspect threshold voltages can matter. I recall the old semiconductor data books described different families of JFETs (short channel, long channel, etc). I would really try to find a replacement JFET with same PN or listed substitute.

JR

PS; but of course I am speculating, if you have similar JFETs try one.

 

[analogguru]

It sounds like you have the model PS 101:
http://www.modezero.com/instant_phaser.htm
https://www.eventideaudio.com/products/legacy/ps-101-instant-phaser

This guy is selling the schematics for it:
https://www.studioelectronics.biz/sunshop/index.php?l=product_detail&p=5061

Or you go here to get at least a partly schematic for free:
https://www.schematicsforfree.com/archive/dir/Audio/Products/Musician/E/Eventide

 

[Rob Flinn]

It sounds like you have the model PS 101:
http://www.modezero.com/instant_phaser.htm
https://www.eventideaudio.com/products/legacy/ps-101-instant-phaser

This guy is selling the schematics for it:
https://www.studioelectronics.biz/sunshop/index.php?l=product_detail&p=5061

Or you go here to get at least a partly schematic for free:
https://www.schematicsforfree.com/archive/dir/Audio/Products/Musician/E/Eventide

That's the one.  Thanks for that diagram link it should be enough for me to work out what's going on !

 

[Rob Flinn]

If they are trying to use the JFETs for continuous phase shift variation, I suspect threshold voltages can matter. I recall the old semiconductor data books described different families of JFETs (short channel, long channel, etc). I would really try to find a replacement JFET with same PN or listed substitute.

JR

PS; but of course I am speculating, if you have similar JFETs try one.

Thanks I'll give it a shot.  If it doesn't work I can always take it out again.

 

[mjrippe]

On the delay the T DE of Eventide, the IT L of Digital, and de of Delay was the favourite letters to sharpie out! 

Ahhh yes, the 1745 I believe!