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Topic: ??? for you Peavey amp gurus |
Richard Rice
From:
Illinois, USA
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Posted 13 Jun 2012 8:41 am |
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I bought a sick Vegas 400, and have the original IC chips. It came with Burr Brown chips installed, with lots of different numbers on them. Are all the chips in this amp the same? In other words, I'd like to take an original chip and move it from place to place, to see if one of the chips currently installed may have gone bad.
Is this a bad thing to do? I looked at the diagram on the Peavey website, and they all seem to be the same thing- but I haven't messed with Solid State in decades, and I wasn't that great with them to begin with. Any advice is appreciated. One channel is working pretty good, the other is barely audible, and quite distorted. Also, the reverb isn't working at all. I cleaned up a bunch of cold solder joints, and have replaced a couple of (physically damaged) pots. I would like to get the amp fully functional, but with my very limited experience, it is challenging.
As an aside, I tried to join the Peavey Forum twice, with two different email addresses, and they have not sent me any activation codes. Then I wrote to their parts department two days ago, but have not received a reply. Frustrating, at best..
_________________
'84 Marlen Custom D-10, 8X4
Oahu Tonemaster 6 string lap steel
Rice Custom 6 string lap steel
Republic Squareneck Tricone
Homebrew 6 string reso
10 string Melobar- Rice modified
Rice Custom 8 string reso (under construction)
Hohner 6 string lap guitar (acoustic)
Kustom K-500 tuck & roll
Peavey Century
Peavey Vegas 400
Peavey CS-800
Bag End custom 1X12 & 1X15 cabs w.EV drivers
Steelin' thru a '72 Vibrosonic Reverb and a '69 Dual Showman Reverb (Stereo) |
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Richard Rice
From:
Illinois, USA
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Posted 16 Jun 2012 6:01 am UPDATE and correction
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Well, I was wrong about the chips in this amp, the seller stated he would include the originals, and that the Burr Brown chips were installed. Not a big deal, but upon inspection the Burr Brown chips were included, but the original IC's were installed when I got the amp. I have since repaired and replaced most of the damaged pots, swapped the BB chips into the amp, reflowed the PCB, cleaned up a bunch of sloppy soldering and spatter. The Normal channel is now working loud and clear, the main channel is about 25% power, and distorts easily. Still, it is considerably stronger than when I got the amp (powered up, no sound at all). No reverb across either channel yet. I'm running out of ideas, a friend who is much more experienced in electronics said he can come by and take a look next week. I've noticed the tone controls on the main channel don't appear to be working properly, either.. they seem to be loading the circuit, but not giving the expected changes. It has been an interesting project so far, and I can tell the amp has lots of potential. LOVE the BW, and it is in super clean cosmetic condition. With a little luck, my friend should be able to find the last remaining bugs in there. He seems to think a cap or resistor may have opened up internally, allowing some signal to pass, but restricting the circuit. Everything looks nice and clean in there now, no evidence of overheating.. As for the reverb problem, I'm drawing a blank. The connections all appear to be good, the small wires in the unit are intact, and the pot seems smooth. I cleaned and lubed all the pots on the amp, so it is something "invisible".. I did notice that if the amp is turned up real loud and I smack the reverb pan there is a very faint crash from the springs, but it is almost nonexistent. Anybody run into this before? Got any ideas? Thanks!!
Although I really don't need this amp at all, I look forward to hearing what it will do- I mostly run a pair of 100 watt vintage Fender amps with efficient speakers, so this is quite different from those.
_________________
'84 Marlen Custom D-10, 8X4
Oahu Tonemaster 6 string lap steel
Rice Custom 6 string lap steel
Republic Squareneck Tricone
Homebrew 6 string reso
10 string Melobar- Rice modified
Rice Custom 8 string reso (under construction)
Hohner 6 string lap guitar (acoustic)
Kustom K-500 tuck & roll
Peavey Century
Peavey Vegas 400
Peavey CS-800
Bag End custom 1X12 & 1X15 cabs w.EV drivers
Steelin' thru a '72 Vibrosonic Reverb and a '69 Dual Showman Reverb (Stereo) |
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Lane Gray
From:
Topeka, KS
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Posted 16 Jun 2012 6:49 am
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Sometimes the tank will get hooked up backwards, and with vastly different input and output impedance, they often work poorly. You might try reversing the wires on the tank.
For the rest of it, I ain't yer guy. Schematics come with the words on renaissance maps of the oceans: Here Be Dragons
_________________
2 pedal steels, a lapStrat, and an 8-string Dobro (and 3 ukes)
More amps than guitars, and not many effects |
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Richard Rice
From:
Illinois, USA
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Posted 16 Jun 2012 7:18 am
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Yep, thanks Lane. I tried it both ways. No change.. You're right, dragons, demons, lions, tigers and bears.. Oh, My!!
_________________
'84 Marlen Custom D-10, 8X4
Oahu Tonemaster 6 string lap steel
Rice Custom 6 string lap steel
Republic Squareneck Tricone
Homebrew 6 string reso
10 string Melobar- Rice modified
Rice Custom 8 string reso (under construction)
Hohner 6 string lap guitar (acoustic)
Kustom K-500 tuck & roll
Peavey Century
Peavey Vegas 400
Peavey CS-800
Bag End custom 1X12 & 1X15 cabs w.EV drivers
Steelin' thru a '72 Vibrosonic Reverb and a '69 Dual Showman Reverb (Stereo) |
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