Bozak CMA-10-2DL Pt.1 – Begining Posted on June 27, 2019 September 17, 2019 by Fabric Astronaut Engineering Four years after cloning the Bozak I had my first opportunity to actually see one in the flesh. Jun 27, 2019  Bozak CMA-10-2DL Pt.2 – Notes Posted on June 27, 2019 July 3, 2019 by Fabric Astronaut Engineering Posted in DJ Mixer Tagged analog, audio, Bozak, DJ Mixer, repair, vintage audio Before I start on the repair, here are some notes on the Bozak.

The first rotary DJ mixerIf it wasn’t because of the Bozak CMA-10-2DL, DJing would have never been possible during the 70s.Rudy T. Bozak designed the very first high quality DJ mixer in mid 60’s (the monoaural CMA-10-1 with 10 inputs) when the whole concept of mixing and “discotheques” was a brand new thing. By the 70’s, the stereo version CMA-10-2DL, had already reached quote of “the standard club mixer” status and it was extremely expensive. In late 70’s/early 80’s, Rudy Bozak kicked the bucket and there was no longer a production of Bozak mixers - until Urei/JBL took advantage on 1982 and released a Bozak mixer clone, the Urei 1620.New mixers - including the Urei 1620 - are designed using IC chips, the Bozak mixer was the only faithful mixer that was built up from ground up using resistors, capacitors, and transistors.

Every component chosen carefully to be able to reach the best audio output possible.The potentiometers was made by Allen&Bradley.The sound of Bozak has a definite shape: the bass is reproduced at the lowest bottom end (great for the old LPs), high frequencies are rounded for a warm sound, and the mids are not screetchy or harsh sounding. A Bozak mixer does not distort or deteriorates the audio output in any way. The Urei 1620 mixer has a recognizable sound, but it colors the audio output anyway.The Bozak outperforms in construction quality, electronic design, and audio quality. The mic preamps on the Bozak mixer offer quiet amplification and reproduction. The Bozak mixer is fully modular with fiberglass PCBs inserted vertically through expansion slots with pins on a major horizontal routing PCB. During maintenance or upgrading, the appropiate circuit element on a PCB can be retrived and serviced.

The open expansion slots allows for sound technicians to make custom designs on the DJ mixer. These internal features are similars to the Urei 1620.The Bozak comes with 2 turntable inputs (upgradeable to 4), 1 balanced mic input, balanced XLR and unbalanced RCA outs.

It also includes a FX loop in/out where any kind of effect or processor can be plug.Bozak quick linksMore Bozak mixer information. An e-mail from Chuck McGregor of EAW companyHi Mick,Happened across your web site and have a few things to add about the subject mixer. The ones made before about 1977-78 used Allen-Bradley not ALPS potentiometers (Type “J” for the inputs rated at something like 1,000,000 rotations.) Also the connectors for the plug-in boards were split pin gold contacts unlike the white connectors shown in your silver version interior photo.Richard Long was responsible for the “effects loop” which was added into the design at his request.CMA-10-2DL did not come into being until about 1970. The CMA-10-2D, a 10 input 2-channel output preceded it in the mid 60s. However each input was mono assignable to either or both outputs.

Alex Rosner had a hand in that design.Rudy did not “kick the bucket” until I about 1983. In any event, he sold the company about 1977, well before production ceased.“Every component chosen carefully to be able to reach the best audio output possible” is not far from the truth. The QC on the mixers was thorough. Capacitors were hand selected for the tone control boards to ensure flat response at the “center position”. Insidious 1 full movie 123movies.

Gain, noise, output levels, and distortion were checked on each unit, with appropriate component replacements made in units that failed these qualitative tests. I wish it could be said that every unit was “listened” to but that was not the case. The components used were high quality throughout.As to servicing, one CMA-10-2DL went through a fire and came back to Bozak with water/smoke and physical damage. It was a mess!! However it worked perfectly on the test bench. Generally, few ever came back for service.Thought you might like to know the above information. It is authoritative (to the limit of my memory) as I worked there from 1974 to 1978 variously as electronics technician, customer service contact, and loudspeaker designer.

I knew Rudy Bozak, Richard Long, and Alex Rosner quite well.My “personal” 10-2DL is still in service as the mixer/preamplifier in my Music Room system (live music, not home Hi-Fi). It was hand built by me for me in the factory about 1976 with a custom tape monitor function.Cheers, Chuck McGregor - Technical Services Manager (EAW)The Bozak shown on top of the page it’s been sold on a Ebay’s auctionTHE LAST BOZAK FROM THE FACTORY. HERE IS A ONCE IN A LIFETIME CHANCE TO OWN THE VERY LAST UNIT TO BE SHIPPED FROM THE BOZAK FACTORYON THE DAY OF THEIR CLOSING. THIS MIXER CAN BE SEEN ON SEVERAL WEB SITES AND IS THE OPENING DLS PICTURE ON MICK’S MUSIC PAGE.THIS UNIT WAS SHIPPED TO ME FROM BUZZY BECK WHO WAS NICK NAMED THE BUZZARD BY THE BOZAK STAFF FOR OVER 10 YEARS.

HE RECEIVED THIS UNIT FROM PAUL HAMMARLUND WHO WAS THE HEAD TECH. AT BOZAK DURING THEIR LAST YEARS. UNIT WAS IN STORAGE FROM THE TIME MR.BECK RECEIVED IT ALONG WITH SEVERAL PROTO TYPES WHICH I HAVE PURCHASED OVER THE YEARS FROM HIM. THIS IS A 100% MINT MIXER THAT WAS NEVER PLUGED IN UNTILL NOW TO CHECK IT. THE UNIT IS A COMPLETE STOCK DLS WITH 3 PHONOS & LABELED ON THE FACE PLATE PHONO 1 - 3, 2 AUXILIARYS,AND 1 MIC. THE UNIT WAS NEVER RACK MOUNTED AND HAS NO MARKS ON THE FACE OF ANY KIND. ONE SIDE IN MARKER IS THE DATE 6/89, AND INSIDE THE LID IS THE INSCRIPTION “TO THE BUZZARD THE LAST BOZAK” SIGNED PAH ( PAUL HAMMARLUND ) AND A LARGE LETTER T.

FOR HEAD TECH. THERE ARE THE USUAL FINGER PRINT SMUGES ON THE CHASIS AT DIFFERNT PLACES WHERE IT WAS HELD.

THE UNIT WILL COME IN THE ORIGINAL BOZAK BOX WITH ALL ORIGINAL PACKING, ORIGINAL DLA/DLS FACTORY MANUAL, AND ORIGINAL WARRANTY CARD DATED 6/89 AND SIGNED BY MR. HAMMARLUND JUST AS YOU SEE IT HERE. PLEASE KEEP IN MIND THAT MR. HAMMARLUND ARE ALIVE AND ABLE TO VERIFY ANY PART OF THESE STATEMENTS. ALSO I RESERVE THE RIGHT TO PULL THIS AUCTION AT ANY TIME IF I SEE FIT.

MODIFICATIONS COULD BE MADE FOR THE WINNER BUT WHY DEFACE A REAL PIECE OF HISTORY. How to uninstall citrix online plug in for mac download. THIS UNIT IS PERFECT IN EVER WAY. OUT OF STATE BIDS ARE WELCOME BUT PLEASE KEEP IN MIND THAT THERE WILL BE A $100 DOLLAR MINIMUM PLUS ON SHIPPING CHARGES TO OUT OF STATE BUYERS.

GOOD LUCK AND KEEP IN MIND THIS IS A ONE OF A KIND MINT UNIT THAT YOU WILL NEVER HAVE A CHANCE TO OWN AGAIN. THIS IS THE REAL McCOY. ANY QUESTIONS PLEASE FEEL FREE TO CONTACT ME. PAYMENT WILL BE MONEY ORDER ONLY!!!! I OFTEN HAVE BOZAK, UREI 1620 MIXERS AND PARTS. THANKS & GOOD LUCK!DJ MARIO G (Mario Giannotte - NJ USA)Former Bozak engineer Buzzy Beck on modern DJ technologyDear Mick,I just spent most of the weekend cleaning out the warehouse and i came up with lots of old equipment that i will e-mail you about. I got to look at the tech web site you told me about (wave) and it looked like some people know what they are talking about, and others don’t seem to know very much.

Please forward this to your friend Scott, it should make him laugh. It is nice to see that someone realizes modern technology a lot of the time is just old ideas polished.Here are a couple of tidbits you can shock the modern world with.

On my first radio station mobile rig built in 1958 for school record dances we had many little items that were not so available to the general public. The unit was built out of ¾ inch plywood and housed 2 altec stereo peamps, 1 garrard record changer ( 16/33/45/78 ) and 1 rec-o-kut turntable. Gee did i just invent the DJ coffin?Under the garrard changer was a 120 volt variac which was used to slow down and speed up a record. The way it worked was if you had to slow a song down you would just drop the voltage on the vari-ac, but to speed a record up required a little more skill.

In order to make a 45 rpm record go faster you would use the 78 rpm speed and slow it down. Gee did i invent the variable pitch control?Ithink i will sell this idea to technics. Oops too late, Dual 1019 from Germany came out in 1962 with this feature long before disco days. One other unique item we had in the middle of the unit was a big 3 inch knob that let you switch the sound from the left turntable to the right, and back to the left.

I think i just invented the crossfader.I will be sending you and mario some very old and interesting pictures soon. If i can locate the old rig (possibly still in my sons warehouse) Iwill send it to you and mario and you can ship it to the smithsonian (ha ha). Oh and by the way the HB on the bozak mixer stood for Hammarlund/Beck. As you know Rudy was long out off the picture at the point of it’s creation. As i told Mario, it was a money issue and it did not create enough interest. Anyway thanks for protecting the old ideas and keep the other bullshiters straight. By the way not to toot my own horn but over the years i installed and maintain over 40 clubs and discos, and was a radio anouncer turned club DJ until my retirement in 2000.

I started in the 50s and have seen and heard it all.A friend (not a glory grabber) Buzzy Beck.