ATMA SPHERE SCHEMATIC for a UV-1 M/M.......

We simply don’t have schematics that look at that good for public consumption.

As some of you may know, the UV-1 is based on the mods/updates we would do to a Dynaco PAS-3.

So the phono stage is very similar to that of the PAS-3. The differences are as I explained to Will:
1) we don’t employ the cathode to cathode feedback resistor
2) 12AT7s are used instead of 12AX7s
3) a cathode bypass cap is employed on the 2nd stage of gain
4) only one output coupling cap is used and the feedback is connected to the output of that. A 10K resistor is then in series with the output of the circuit.

So if you can find a PAS-3 circuit online and apply these changes, then you can build this circuit.

Here is the PAS-3,  all over the internet.... the v5 and v6 boards are both on this pdf

http://www.curcioaudio.com/pas_mnl.pdf

There are more issues that just a board, which of course won't fit in a UV-1......Power supply hook-up and values, parts placement for low noise problems.......Sometimes I have to ask myself why I would even ask  ??       I'll just buy a PAS-3 and use it......... 

@autospec 
Well,  For Myself,  I'm a speaker guy and can follow anything that has to do with a speaker, follow direction draw schematics, make changes, repairs etc... Amps, pre's, not so much, but I can look at and follow a schematic and make changes as needed. If Ralph told me to change the cathode bypass cap.... I'd say Huh,  well maybe not,  I understand the cathode for tubes.... My point is or question is:  Do you understand what Ralph is saying or are you more like me and need a schematic to follow along?  I can tell you that after 8  or 9 years on this forum, I've never seen anyone more helpful than Ralph Karsten.  

As predicted, Ralph provides the kind of service that helps those needing it...

@charles1dad, exactly!

Consider the days when these audio / video circuits and designs were actually cutting edge, SAMS Photofacts and the like published the requisite detailed component documentation.  As a former chemist / material scientist, I can easily reverse engineer most formulations through the MSDS (Material Safety Data Sheet), but the means exist for a company wanting to protect itself against it.  No one wants government involvement and the hassle it brings along less than I do.  The industry evolving to the current state makes it clear the balance toward consumer protection will not happen without some higher entity involving itself