Moose or NE-1 Small Stone Vibrato Mod (dry lift) question...

[BillyJ]

I am doing a mod for a friend, we are going to do the Univibe mod, the Phasefilter (last two stages only), and the vibrato or dry lift mod.

Here is a link to mooses site where the mods I am talking about are:
http://www.moosapotamus.com/frankenstone/frankenstone.htm
Also here: http://www.lynx.bc.ca/~jc/pedals.html
And also thanks to Mark Hammer for the phasefilter mod.
Sorry if I don't know exactly who is to thank gfor each of these mods but thank you all none the less....

Ok read this from Mooses site:
"Then, there's the mono/stereo switch. This actually does a couple of things. Primarily, it's a vibrato switch, breaking the part of the circuit that blends in the clean, unmodualted signal, leaving only the modultaed signal at the main output. The other thing that this switch does is sent the clean, unmodulated signal to the second output jack that I added, providing pseudo-stereo outputs."


What we would like to do is the above mod but instead of a stereo setup we were thinking a mono jack with a pot that blends the dry into the wet signal at the output.
Is there something wrong with this idea?
Or perhaps instead of at the output maybe just put a pot that either let's the dry signal through or shunts it to ground?
The latter seems a better idea (it just popped in my head while writting.
Any reson this would not work well or any cooler way to do this?
At the output (assuming it would work at all like that) we could get the effected signal even lower than normal and make it more subtle.
Hmmm... I have some thinking to be done about this one but any help or guidance is most appreciated.
Thanks thanks and more thanks!!!

[mattv]

Either will work fine and be more versatile than using just a switch. If you like a very subtle phase, the blend pot seems like it would be more to your liking.

[moosapotamus]

Nothing at all wrong with your idea.

You could do the blend pot a couple different ways... If you put it on the clean side, instead of tieing an outside lug to ground, I would wire it like a variable resistor.

Another way would be to replace the 27K and 30K mixing resistors with a 50K pot. Tie the outside legs to where the resistors used to be and the wiper to the 0.1uF cap. I did this on a Phase 100 and it worked nicely.

~ Charlie

[Mark Hammer]

Thanks for the phasefilter mod go to the following in this order of priority:
a) either Dave Tarnowski or Dave Rossum (one of them designed the SSM2040 chip that prompted it)
b) John Blacet for recognizing the use of a multiple-identity filter and implementing it in the Blacet Phase-Filter in the late 70's
c) Craig Anderton for bringing it to guitarists' attention in 1979 in DEVICE
........d) wayyyyyyyy down the list is me for taking 23 years to stare at the Small Stone schem and SSM2040 appnotes before I realized they were the same damn thing.

When it comes to phasers, personally I find that what works best for me is a control to adjust the wet level from a 50/50 wet/dry blend (which gets max notch depth) to subtler wet levels for when you want to crank the regen but not rub it in your face.  In tandem with that is a single switch to lift the dry signal for vibrato effects.  For the SS, consider having a 22k resistor instead of the 27k, in series with a 100k variable resistor in pot form.  This will let you zero in on a perfect 50/50 blend for max notch, and produce variations in phaser subtleness.  I can't see where you'd want to produce greater subtlety than what 122k of serries resistance would yield, but that's me.

Is there merit in having variations in more wet than dry available?  My own judgment is 'no', although others may have something different to say about that.

[puretube]

Hi there:
David Rossum (Oberheim) is definetely the "daddy" of the OTA/SmallStone -"mods" [US3969682],
but he sure had read the "grandpa`s" Dennis P. Colin (ARP) [US3805091]
patent...

Dunno for sure, but probably Rossum then encouraged/influenced or designed SSM`s integrated circuits.