expanding on Hammer's ross/dyna mod..will this work?

[Johan]

im thinking of building a Ross compressor clone and also include the "Hammer-mod"..but looking at it, I think I spoted something more, easily implemented...
the Hammer mod as I understand it, basicly involves replacing a resistor with a pot to change the releasetime..refering to this schematic http://generalguitargadgets.com/diagrams/geo_d&r_comp.pdf it would be R18
now, what if I break up the collectors of Q2 Q3 from the R18/C16 junction and install a pot wired as a variable resistor, say 20k, between them and this junction?...when compined with Mark's mod, wouldnt that make for BOTH an attack and a release pot?
..but would it work?...I havnt started it yet, so I cant try it at the moment...just thinking/wondering

johan

[Johan]

..bump..

[Mark Hammer]

You could just try a switch for different values of C16, and that would probably work just as well.  My sense is that variations in release/recovery are probably more meaningful and usable than variations in attack.  The other thing is that variations in the attack resistor also reduce the drive current such that variations in attack time and compression amount get confounded.  You'd have to keep adjusting the compression pot every time you adjusted the attack time.

And please, people, it's not MY mod.  I stole it from a half dozen commercial pedals that took the basic Dynacomp rectifier design and took it a step further.  We should just call it the "variable recovery mod".  That's not a scolding.  I'd just prefer to receive credit only for things that are my ideas, not for ideas I've borrowed.

[Johan]

thank's Mark
I think I'll try the attack pot just to see anyway...I'm building this one for a bassplayerfriend, and he saked if it was possible..I guess try and see is the way go go here..I'll report back when I know.....and sorry about calling it the Hamer-mod...its just that, that's the only way I've seen it refered to...

johan

[markm]

I played around with the 150k that controls the attack----or recovery I can't remember now!---- in a Dynacomp build I did.
I found that in my opinion, when I changed out this resistor for a smaller value, this circuit started to taked on some of
the Orange Squeezer type personality.
I didn't like it and went back to stock values.

[Mark Hammer]

I played around with the 150k that controls the attack----or recovery I can't remember now!---- in a Dynacomp build I did.
I found that in my opinion, when I changed out this resistor for a smaller value, this circuit started to taked on some of
the Orange Squeezer type personality.
I didn't like it and went back to stock values.

Which is exactly why you do it, and why you make it reversible with a switch.
Yup, one of the major differences between the OS and Dynacomp is thespeed with which the level is restored vs "suppressed" for a bit.

[markm]

I should make it clear that I DO like the O/S too!
I've been thinking about building another Dyna circuit just to mess around with the Hammer Mods!
  Thanks Mark!!

[Transmogrifox]

You could just try a switch for different values of C16, and that would probably work just as well.  My sense is that variations in release/recovery are probably more meaningful and usable than variations in attack. 

I agree.  Do something similar to the Crybaby 535Q mod employing a rotary switch with various values of C.   You would want a trimpot for R18 here to compensate the release time as well.   The adjustable attack mod is destined to be interactive, any way you cut it.  IMHO the interaction with release time would be a less inconvenient byproduct than interaction with the sensitivity.