Bickster who modded the Sunn will post a separate thread about the Mods to the Sunn. Quite interesting and I am sure there will be plenty of discussion there.
Thanks. This forum rocks!~

Moderators: VelvetGeorge, BUG
The Keeley modded Sparkle Drive pedal is what I own, and it has that clear, unveiled, perfect (amount/type) of gain onhand. I also have the Keeley Boss Blues Driver BD-2 pedal which I use quite extensively. These two pedals are must haves for most of the classic rock I do, so that my other OD's like the Boogie V Twin, Fulltone Fulldrive 2 Mosfet, and Fulltone RTO typically go unused.Tone Slinger wrote:Yeah, the Voodoo Labs guy. That is a VERY 'generalistic' approach,in that the more obvious,on the surface, aspects of Ed's old tone are fairly easy to get at. Its the last 5 to 10% of Ed's tone that is the deal breaker. Still, this vid got me interested in that 'Sparkle Drive Mod' pedal. Seems to be a very versatile dirt box that could make most any amp 'useable' in a distorted kind of way. You never know when you might be in a situation where you have your guitar, but no amp. This pedal looks like it could make a very 'general' PA amp sound good enough to get by with.
For the price that some vintage Phase 90's are going for:garbeaj wrote:All that said...buy a vintage Phase 90. They really aren't that expensive.
garbeaj wrote:But who would want one of these or any other expensive boutique pedal when you could have THE sound that everyone is trying to clone if you buy a vintage Phase 90?!?!
If you want something that is similar to a Phase 90 but with more knobs...be like Keith Richard and Ronnie Wood on Some Girls and get a Phase 100.
Excellent info !YMI5150? wrote:..."The original Phase-90s used ceramic capacitors which we changed to polyester caps in the Orange Box. Losses due to dissipation factor of the older style ceramic caps may have contributed to the more subtle effect but these losses also varied depending on the run of caps we used at any one time. So the units were inconsistent . . . some subtle, some thicker. Going to polyester caps in the current Orange Box allows Whirlwind to make the most consistent version of the original design.
There is a way to degrade the mix where the all pass filters are mixed with the dry signal. This happens to occur through a 150K resistor that is "flown" across the board. Adding more resistance in series there will degrade the mix and produce a more subtle effect. The problem is guessing how much resistance to add to suit your particular taste.
You could perhaps put a small 200K trim pot in series with the flown resistor and adjust it to taste. Or try different fixed resistor values but at the risk of the PCB getting hacked up which wouldn't be covered under warranty.
Another thing to remember that may be obvious, is that when listening to the effect with just a guitar and amp and no other instruments playing, the effect will be more intense sounding than in the context of playing with a band. When bass, drums ands vocal are added, the phasing on the guitar takes on less significance..."
Or you could just buy a vintage Phase 90JimiJames wrote:Excellent info !YMI5150? wrote:..."The original Phase-90s used ceramic capacitors which we changed to polyester caps in the Orange Box. Losses due to dissipation factor of the older style ceramic caps may have contributed to the more subtle effect but these losses also varied depending on the run of caps we used at any one time. So the units were inconsistent . . . some subtle, some thicker. Going to polyester caps in the current Orange Box allows Whirlwind to make the most consistent version of the original design.
There is a way to degrade the mix where the all pass filters are mixed with the dry signal. This happens to occur through a 150K resistor that is "flown" across the board. Adding more resistance in series there will degrade the mix and produce a more subtle effect. The problem is guessing how much resistance to add to suit your particular taste.
You could perhaps put a small 200K trim pot in series with the flown resistor and adjust it to taste. Or try different fixed resistor values but at the risk of the PCB getting hacked up which wouldn't be covered under warranty.
Another thing to remember that may be obvious, is that when listening to the effect with just a guitar and amp and no other instruments playing, the effect will be more intense sounding than in the context of playing with a band. When bass, drums ands vocal are added, the phasing on the guitar takes on less significance..."
The only otherway I knew of, to thin out the phase signal and make it less thick, was to run a voltage attenuator (deVolt, Dan Electrode or a VooDoo Lab PP2+) between the pedal and dialing in less volts.
... or... use a Phase 45.
Thanks for the R&D YMI5150? !