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|3/20/1999 5:37 AM|
||Mesa Boogie Maverick schematic on-line!|
I found this little gem in my mailbox yesterday and there are a lot of neat tricks that Mesa is using here. Like the Fat/Bright switch on the Rhythm channel selects between the inverting and non-inverting outputs from V1B (which is the second half of a dc-coupled pair). The Lead channel uses a second tone stack after V2A, but with fixed valued resistors instead of pots! And there are quite a few little RC contour networks, but in series with the audio signal, and shunted to ground. I had been totally blown away by this amp when I tried it out in a store a year or two ago. So its great to see what makes the critter tick. (This schematic only shows the preamp- maybe I'll get lucky and find the power amp/power supply schematic in my mailbox another day!) In case you are not familiar with the Maverick amp, it tries to recreate many of the vintage sounds in a channel switching design (so it's lower gain than your typical Boogie).
http://www.techaccessinc.com/blueguitar/maverick.jpg" TARGET="_top">http://www.techaccessinc.com/blueguitar/maverick.jpg [84K]
P.S. Here is the original shareware zipfile for JASC Image Commander 2.0 (best program around for viewing, printing and processing graphics files, without actually "editing" them- i.e., no drawing tools!) The program has been discontinued by JASC and although it indicates that it is limited to a 30 day trial period I'm up to Day 485 and counting. (Hey, I tried to register it with JASC but they wouldn't take my money since the product no longer exists...)
http://www.techaccessinc.com/blueguitar/jic200.zip" target="_blank">http://www.techaccessinc.com/blueguitar/jic200.zip">http://www.techaccessinc.com/blueguitar/jic200.zip [2,025k]
|3/20/1999 5:23 PM|
And there are quite a few little RC contour networks, but in series with the
audio signal, and shunted to ground.
That's typical Mesa. They need to add all those shunt capacitors to keep the circuit from oscillating.
The switch to select between driving the rhythm tone stack with a common cathode stage or cathode follower is kind of neat. Otherwise, it's a pretty typical Mesa circuit.
|3/22/1999 12:43 PM|
A Mesa schematic where the input is at the left side!
|3/22/1999 4:42 PM|
Is R. Smith left handed?
|3/23/1999 2:32 AM|
Is R. Smith left handed?
Well, I thought it was a bit under-handed how he took established ideas from the public domain and put patents on them...
P.S. On page 2 of their 1995 catalog there is picture of him working on a Baron power amp with his wrist watch on his right arm so I think you're right! (Page 30 shows Sharon testing power tubes by tapping them with the wooden handle of a hammer- "the Mesa hammer test". Jeez- if you're going to use a hammer, hit 'em with the head! Advertising BS...)
|3/24/1999 9:09 AM|
I doubt that the schematic was actually from Mesa- it looks more like what someone out in the field drew up.
BTW I've posted a few more goodies that showed up in my mailbox: the Soldano SP-77 preamp, the Bogner Triple Giant (preamp only) and the Fender Tone Master. The Brown channel of the Bogner refers to a Drive and an EQ section on a seperate pcb which is not included on the print. Was Bogner one of those companies that would wire in a stomp box-style ss circuit into their amps? I was thinking that the Drive pcb might be something like a Boss OD-1 and the EQ might be a graphic equalizer (although it looks like a tweaked 5F6A tone stack would work just fine there). Any ideas?
|3/24/1999 11:43 AM|
The "style" of the drawing (the shape of each part, etc.) looks a lot like the Mesa schematics on the Tube Amp Book (except for the left to right thing).
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