Any Quad Eight Q8 Experts Here??
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Any Quad Eight Q8 Experts Here??
Hey all...
I just got these Quad Eight mic pres, and had a few questions for someone who might know a bit about them....
(Yes, I've googled the hell out of them... )
They are supposedly model MP-404 pres...can anyone confirm this?
(I'll post a pic of a model stamp that might refute this...)
Anyway, they sound great, but the gain seems to be very low, so I have them at my tech's place to make sure everything is wired up correctly...
OK, some pics:
...and here's the stamp that is onboard:
Any light that anyone can shed on these puppies would be greatly appreciated...
Thanks, and have a great '17 all...
I just got these Quad Eight mic pres, and had a few questions for someone who might know a bit about them....
(Yes, I've googled the hell out of them... )
They are supposedly model MP-404 pres...can anyone confirm this?
(I'll post a pic of a model stamp that might refute this...)
Anyway, they sound great, but the gain seems to be very low, so I have them at my tech's place to make sure everything is wired up correctly...
OK, some pics:
...and here's the stamp that is onboard:
Any light that anyone can shed on these puppies would be greatly appreciated...
Thanks, and have a great '17 all...
"You see, the whole thing about recording is the attempt at verisimilitude--not truth, but the appearance of truth."
Jerry Wexler
Jerry Wexler
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- A.David.MacKinnon
- ears didn't survive the freeze
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- Location: Hamilton ON, Canada
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Many similar mic mixers historically have low gain amounts as they are mean to feed another preamp for final level. I can't say for sure about these. At face value the IC gain 'could' be up to 40dB easily, but doesn't mean it is. Change of gain path structure could increase overall output. Loss may actually be in the 4->1 mixing system, whatever that is; passive maybe.
Doug Williams
ElectroMagnetic Radiation Recorders
Tape Op issue 73
ElectroMagnetic Radiation Recorders
Tape Op issue 73
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Unlike the discrete versions I have here those are the later simple transformer in front of an opamp design. Gain is set by r shunt/r feedback +1.
Modern opamps like LME49710's will allow for the resistor swap to increase maximum gain, use that formula. Decrease the gain shunt resistor, 10k feedback + 200 ohm gain shunt from the inverting input to the gain set blocking cap will give you a +40 db max gain. Add the 20 db gain from the input transformer and you get +60db max
Swap the carbon film resistors to metal film for less noise.
Modern opamps like LME49710's will allow for the resistor swap to increase maximum gain, use that formula. Decrease the gain shunt resistor, 10k feedback + 200 ohm gain shunt from the inverting input to the gain set blocking cap will give you a +40 db max gain. Add the 20 db gain from the input transformer and you get +60db max
Swap the carbon film resistors to metal film for less noise.
Jim Williams
Audio Upgrades
Audio Upgrades
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