Rehabbing a rusty Peavey Mark IV Mixing Console

tensleep

Addicted Member
Years ago, back in my yoot, I lived in Memphis, TN. While there, I hooked up with some other young men who were forming a frat band, as it turned out, called The Generics. We started out very humble and I was the amateur soundman (more of a glorified roady at first). The rock and roll was fun, the fellowship better, and the free libations abounded.

Over time, we got better and traveled some. I was finally able to purchase a brand new Peavey Mark IV 24 channel beast of a console. I knew nothing about electronic theory and very little about audio or professional sound reinforcement, but I picked up a lot through experience and networking with other starving artists.

After a few years, I had to move on and sold my board to the band. Since then, I have gained technical training in electronics and electrical theory (EET) and practical experience as an industrial electrician. Once the audio bug hit me hard several years ago, especially after exposure to AK, I always wanted to get my hands back on this mixer.

Well, one came up for sale earlier this month on Craigslist for $50. I snapped it up and have done some cleanup work. The faders and pots were really stiff and dry, and the nuts, washers and screws were rusty. The pot and fader knobs were gummy, too.

I didn't want to sink any more money into this relic until I had a chance to test it, so I pulled channels 1-4 and the main section. Liberal use if Simple Green, Deoxit and Fader Lube, and some mineral spirits have helped tremendously. I also have an ultruasonic cleaner that helped eliminate a lot of the rust on the hardware and grime on the knobs.

I put the board back together today for a trial run and voila! Success! I am running the sum out into a two-way electronic crossover. I am vertically biamping a Klipsch KP301, driven with a QSC CX1202V. I have also tested the sub channels and they are working well, too. Later, I will pick up some more patch cables and will run both Klipsch, biamped horizontally with the QSC on the bottom and an Alesis RA100 on top, until I can come up with a different amp. I want to use the Alesis on the monitor circuit.

Here are some pictures:
 

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more pics
 

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last pics.

This is a testament to how well these boards were designed and built in the first place. This one has been totally neglected over the years and after a few hours of cleaning, it is coming very much back to life!
 

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$50, eh? That's depressing. I'm thinking about selling my Tascam Model 5 that I bought for $1500 30 years ago. I have a feeling it's in that neighborhood.

I've never had a problem with any Peavey mixer I've run across. I bought a 710S 7 channel powered mixer in the late 70's and ran around working for a band playing small bars every weekend in 1980. It got the hell beat out of it but never failed. :no:
 
Going to need a gallon of deoxit and faderlube..:D

That's for sure! I can tell that I already need to reshoot the faders that I have cleaned up. But, so far so good! I have only been using channels 1&2 and subs 1&2 for stereo in the garage. I will probably check out channels 3&4 and subs 3&4 tonight, if the garage isn't explosively hot!
 
Ok, some trouble with channel 3 and sub 4. I will probably open the board up again this weekend. Channel 3, the fader will not turn the sound completely off - in fact, it is at a pretty high volume. Sub 4, there is a pulsating tone, like a helicoptor (whup, whup, whup), that changes with slider position. The audio coming through is very distorted.
 
Ok, some trouble with channel 3 and sub 4. I will probably open the board up again this weekend. Channel 3, the fader will not turn the sound completely off - in fact, it is at a pretty high volume. Sub 4, there is a pulsating tone, like a helicoptor (whup, whup, whup), that changes with slider position. The audio coming through is very distorted.

That helicopter sounds makes me think there is a feedback loop being made by dirty contacts in a switch.

I used to have a Panasonic 3" reel to reel tape recorder back in my early teens. It got to where, as it aged, it would record a sound somewhere between your helicopter and a ripping/tearing sound. You wouldn't hear it when you started the recording but when playing back it might be there. It was probably a dirty multi-contact slide record switch that I could have cleaned with contact cleaner but I didn't know that then.
 
That helicopter sounds makes me think there is a feedback loop being made by dirty contacts in a switch.

I used to have a Panasonic 3" reel to reel tape recorder back in my early teens. It got to where, as it aged, it would record a sound somewhere between your helicopter and a ripping/tearing sound. You wouldn't hear it when you started the recording but when playing back it might be there. It was probably a dirty multi-contact slide record switch that I could have cleaned with contact cleaner but I didn't know that then.

I am very convinced that you are right - as avionic pointed out, buckets o' caig products are in order! I may pull that board out this morning. However, at the moment I am playing with computers and doing some wall repairs. My youngest managed to knock a hole in his sheet rock.
 
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