Billy Joel wrote a song about me...

jbeckva

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#22
laatsch55 said:
JRC- 4560, 4580's are also a good choice. What does it have now??
Right now MC33078's. Specs are pretty good on those... .002 THD 7V/uS slew rate, but the 4562 blows em out of the park with .00003 and 20V/uS.

Damn, I only got one 4562! Time to put in an order.
 

Web Police

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#29

jbeckva

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#34
laatsch55 said:
What is a PIP card??
Essentially, a PIP card is a plugin module at the back of the amp that interfaces with the amp's main inputs. Crown has (or had) a lot of different cards that performed functions on the amp's input from simply interfacing it with either XLR or RCA, to active filters/crossovers, to remote attenuation that would be used in a PA system control/sound board.

The first comtech crown I owned had some fancy PIP card with balanced XLR's in the back and a digital attenuator/control bus. I got in touch with a contact at Crown at the time, and purchased a simple "straight through" XLR input card, and a pair of XLR to RCA cords.

The one I have now has a terminal block and has an isolation transformer, a stepped precision attenuator, a defeatable high pass filter, and something that they call a "Constant Directivity Horn" EQ circuit which introduces an EQ curve with a 3db rise at 3.2khz and peaking at 12.5db at 24khz. Something to do with specialized speakers??

I'm thinking about doing a mod to it and making it completely passive and "straight line". The one caveat I suppose is bypassing the isolation transformer, as it's purpose is to minimize noise and ground loops.
 

jbeckva

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#35
And BTW el naysayers...

I just noticed on the PIP card I have that there's one of the three opamp sockets that uses both opamp channels for both L and R signal paths - standard unity gain buffer. I swapped out the amp there with my remaining LM4562, and it's even better soundin' than before. I wonder... with the isolation transformer and how it does have an active low pass filter (cutoff at 33Khz.. maybe if I was Lassie I could hear that), the combination of that and the high-def buffer I got goin sure seems a lil bit "toobie like" to me. Not harsh in the least...

Mebbe I go find big VU meters, stick 'em on the top eh? Mount 'em on the front??

Paint some on? Or at least paint a big happy face on the front?
 

jbeckva

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#37
Web Police said:
stuwee said:
I couldn't find any drunk dudes using a weedeater, I guess they all got tazed for pissing in front of police officers on the highway :rabbit:
Jerry and his buddies adjusting the string length on his weed whacker. :rabbit:

http://www.youtube.com/watch?v=VRlUKYga1Qw
Nah.. dumbest thing I've done in awhile is leave my soldering iron on (damn.. what the hell was I solderin... must have been DAYS AGO) :albino:
 

stuwee

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#38
jbeckva said:
Mebbe I go find big VU meters, stick 'em on the top eh? Mount 'em on the front??

Paint some on? Or at least paint a big happy face on the front?
Make some big rig side exhaust pipes with heat shields and flaps, and paint some hot rod flames down the side :angry5: :blob6: :angry5:
 

jbeckva

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#39
How 'bout I take one of those old "stretch armstrong" toys, rip the muscle-bound arms off and glue 'em to the sides of the amp, posing like a "he man"??

That'd be cool...

 

laatsch55

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#40
Thanks Jer, appreciate that education there. You shpuld be able to fix any ground loop problem. The input isolation transformer in pro applications helped keep feedback to a minimum as roadies plugged and unplugged mikes and instruments while leaving the amps on.
 
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