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Post by digiTED aka 'Ted' on Feb 24, 2013 15:24:26 GMT -7
I'm considering a local trade for an original Stingray 2x12 w/ Blues.
30 Dr. Z watts and a 2x12 is an absurd amount of volume for my needs, but I love those Sta(i)ngray cleans!
I know the Good Dr. likes his PPIMV implementation w/ cathode bias designs.
Has anyone tried a PPIMV in their Stangray?
Is there some reason not to have a Stingray modded due to collectibility reasons?
I already have an Air Brake; should I just stick with that?
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Post by John on Feb 24, 2013 18:36:31 GMT -7
Stick with the airbrake...that's my vote.
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Post by muZician on Feb 25, 2013 3:39:26 GMT -7
yea, stick with the Airbrake. The PPIMV will reduce overdrive/saturation of your power tubes: so you will not get the fat sound of your cranked up amp. The Airbrake will of course reduce speaker air-movement. But the power stage will breathe and produce wonderful harmonics while saturating
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Post by jesslm02 on Feb 26, 2013 13:58:48 GMT -7
I'm not sure a PPIMV can be done on the 'Ray since it has a CUT control. That's why it can be done on the RX series though, no CUT, which essentially is installed in the same location as the PPIMV would be - between the PI and output tubes.
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Post by muZician on Feb 27, 2013 2:28:54 GMT -7
The PPIMV could be done anyway BUT it could influence how the cut control works. I do not know how it's done. If it is a feedback circuit like a PRESENCE control (from the power output to the gate of the power tubes with a small reactive circuit) I think that a PPIMV could be implemented without influencing the cut control.
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Post by jesslm02 on Feb 27, 2013 11:42:20 GMT -7
It would most definitely influence the how the cut control would function. It could still be done, but would pretty much require a complete redesign of that section for it to work properly with a PPIMV. The cut control doesn't work like a presence control even though it is sometimes called that.
When I say presence control, I'm thinking Fender, which is tied into the feedback circuit as muZician mentioned. A cut control simply cuts highs after the PI by mixing them out-of-phase through a capacitor and Pot wired between the PI plates. Specific values of that RC network, determines the frequencies that are affected. The PPIMV is also tied in after the PI plates which could cause loading issues if installed alongside the CUT. It can be done though, and if I was going to trust anyone to do it, it would be the Mr. Zaite.
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Post by digiTED aka 'Ted' on Feb 27, 2013 12:15:58 GMT -7
Interesting tech discussion happening, gentlemen; thanks! Short answer for me is to use the Air Brake I already own. It's 20% 'awesomer' anyway since it has the TW logo
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Post by muZician on Feb 27, 2013 23:49:31 GMT -7
It would most definitely influence the how the cut control would function. It could still be done, but would pretty much require a complete redesign of that section for it to work properly with a PPIMV. The cut control doesn't work like a presence control even though it is sometimes called that. When I say presence control, I'm thinking Fender, which is tied into the feedback circuit as muZician mentioned. A cut control simply cuts highs after the PI by mixing them out-of-phase through a capacitor and Pot wired between the PI plates. Specific values of that RC network, determines the frequencies that are affected. The PPIMV is also tied in after the PI plates which could cause loading issues if installed alongside the CUT. It can be done though, and if I was going to trust anyone to do it, it would be the Mr. Zaite. you are right: if the cut control is done like that you cannot decouple it from the PPIMV...you would need another impedance converter in between (another gain stage)
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