The little known Dynaco PAS-3 Series II - photo

Interesting...
I wonder if all 6 12ax7's are really necessary or if they just added extra tubes for the look like some chinese amps on ebay.

Probably 4 12AX7's for the phono stage and 2 for the line stage.

Sal

Or...and this would have been a worthwhile addition if done properly...a cathode follower for both channels of the phono stage and the linestage, to make the circuitry almost unaffected by the input impedance of whatever is connected to the preamp.

Cathode followers, they are!

Hi, Bob, thank-you for the link, but I believe I cannot see the values of the 3 caps. Would you happen to know someone that may have the complete schematics.

Regards Sandro

Thank-you for your time, if ever happen to find out I would love to have these values. Are able to post a request on your site. Thank-you again for all your help and time.

Best Regards
Sandro

Thanks Bob, that was great to see. How long were they sold? Were they a limited production?

Thanks,

Jon

Hi,
There were two versions offered...One with the Chrome faceplate & knobs (like the photo above)
and the other with a Black faceplate & knobs. Both were designed & sold through Sound Values in Ohio...Jon & Joy Petterson I believe were the owners. I suspect that not many of these units were produced...I would guess a few hundred at best.


Some time later Panor Corp. began making their own version of this PAS. I actually have a few of the "Sound Values" PAS Series II NOS power transformers on the shelf.....PC mounted style.

Kevin

Bob Latino wrote:Below is the PAS-3 Series II schematic less the power supply. You can judge for yourself how the three 12AX7's per channel were worked into the circuit.

Oh my goodness, both stereo channels in each tube envelope!

Nobody ever said Panor was the brightest bulb in the box. They bought "Dynaco" for the name, but did not have the engineering prowess to match the reputation.

The PAS-4 has four tubes in the phono section: Two 12AX7's and a pair of 6922's. The line stage has the remaining pair of 6922's.

GP49 wrote:Nobody ever said Panor was the brightest bulb in the box.  They bought "Dynaco" for the name, but did not have the engineering prowess to match the reputation.

The PAS-4 was the exception regarding a well engineered, Panor unit. It was designed by John Nunes of MFA fame.

dyna1 wrote:Hi, Bob, thank-you for the link, but I believe I cannot see the values of the 3 caps. Would you happen to know someone that may have the complete schematics.

Regards Sandro

Hey Dyna 1,
I measured my 3 silver non labeled power supply caps on my restored knight cap tester.
The fourth is labeled on the can wrapper.
I too wanted to recap the power supply so I needed to know the capacitance.
Each cap measured very close to 150uF.
I ordered and installed 3 of those at 450Vdc with 10mm lead spacing and they slid right into position.
The fourth had 8mm lead spacing but pc board had extra hole for 10mm lead spaced cap.
Very good selection at Mouser, I picked Cornell Dublier.
Pre amp running just fine and sounds even better, if that is really possible.