And again a question about the Bozak CMA 10 2DL: In the Line or Monitor Amps schematics of Micks Music Page, the schematic on the right side (wich is NOT the 'Right' Channel) has two resistors R21 and R16, wich don't exist in the Resistor tabel. If I use the numbering from that below tabel, R21 will be R31 and R16 = R26. Now comes my problem, its a bit complicated: If R26 is 68 ohm, than there will be a very large current running through the transistor Q6 (ohms law:the voltage of 1 diode divided by the value of the resistor), wich isn't possible because of the value of R9 and R10. So my first question: Is the value of R11 and R31 realy 68 Ohm??? Second: has anyone the DC voltages at the output BEFORE de condensator C10, and of the bases of Q6 and Q7? (or A service manual would be very usefull) If not, is Anyone willing to measure these? If needed, I can give instructions.

Copy the code and click on close Step 4. Serial number boxcryptor 2017 18.

Bozak moved to the in 1935 to work for Cinaudagraph out of. Two years later he was chief engineer. At the, a tower topped with a cluster of eight 27' Cinaudagraph loudspeakers in 30' frames with huge 450 lb. Thanks to Bozak, Rosner iphone another audiophile called Richard Long, The Bozak CMA-10.

(maybe a Life Insuarance if wanted:D:D ) Thanks again Thijs. The schematics seem to be of an old version of the mixer.

They came from Sheldon A. The schematics seem to be of an old version of the mixer.

They came from Sheldon A. If you check out This Thread (you'll notice that the Bozak uses 3 different types of circuitry. Taken from Vinyl Junkie's threadThere are 3 (not including the original D, which is different, but so rare it doesn’t bear discussion) types of Bozak circuitry – and you can interchange between transistors and various other options such as caps and I/O features freely. This means that the mixer can be customised exactly to a configuration that suits your ears – some people prefer the ‘hairier’ sound of the early Bozak, and some prefer the ‘sweeter’ sound of the later models – you can even have an interim version which isn’t as quiet as the last DLA-onwards version, but is just as smooth – for example. What's amazing is that people talk about the Bozak having a 'particular sound', yet the 3 versions all sound very different (this is also complicated by the fact that each version is sensitive to setup, which – again - affects sound). Due to its design, the Bozak is particularly sensitive to transistor beta.

The 3 grades of circuitry used each have very different transistors, each with completely different noise specs / Hfe. Anyway - as I said response to your PM, MC, because Bozaks were hand-built, they often substituted parts - you find many inconsistencies and anomalies. I regard finding out which quirks apply to your mixer as one of the joys of owning a Bozak - each one has a different story to tell.

BTW - In the 2nd post in this thread, the poster is talking about the DLA-onwards type of circuitry, which would explain the confusion! I find it absolutely amazing that, in all the 5 years I’ve been visiting this group, this and VJ’s thread from last December are the first times I’ve seen it mentioned that the Bozak uses 3 different kinds of circuitry!:) Justin. Was this change in transistors more related to the production run than model?

For instance, if one had a DL model but is it a 'G' series serial number (indicative of a 'late' unit), i would bet it's parts nearly identical to the other units produced in that time-frame. That's my guess at least. From what I've seen, there are 2 versions of DL, and the DLA-onwards (DLO/DLC etc) all use the ubiquitous BC550/560 The 'C' designated 550/560 has the best Hfe - and IMHO - is therefore best suited to the Bozak (Bozak updated the mixer as the parts became available from what I understand - you could say they 'moved with the times' - the DL / DLA mixers were quite forward-thinking in terms of their component choices, and - with massive silicon developments occurring during the seventies - the designs moved ahead as semiconductor technology enabled it to). Justin notice the note about bipolar transistor replacements on the lower center.:).