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Dynaco Pas pre
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s-petersen
Scott
Do the tone controls have a detent at the flat positions?
I recently had the same question
Here is an article about the Dynaco PAS pre-amp
http://6streetbridge.blogspot.com/2013/02/the-most-important-preamplifier-in.html
Here is an article about the Dynaco PAS pre-amp
http://6streetbridge.blogspot.com/2013/02/the-most-important-preamplifier-in.html
Yep, looks to be a 3X all right. In mine, I replaced the little 'lytics with Solen film caps, and the "Black Cat" molded-paper caps with Orange Drops. There was also a PAS-2X, which was a PAS-2 fitted with the special tone pots and added caps. I'm not sure why Dynaco didn't bother to specify the model # on the back label; maybe it's because the only real difference between the PAS-2 and PAS-3 was the front panel and knobs, but they could've at least noted the 'X' tone control difference on it. 
-Adam
-Adam
moebuster
Super Member
oh- and to answer the question-no they do not.
the green caps signify pas3, early pas3 used the brass faceplates of the pas2 era , and
there was an option from Dynaco for the new silver face. Pas2/3 distinction is
with the green caps not the color of the face plates.
otherwise you would see PAS3 with the silver faceplates and NO green caps if they
were that interchangeable. (if you do then the faceplate was replaced but see below)
Another one of those telefunken smooth plate 12ax7, and cloth covered transformer
leads myths created by consensus.
back about 30-35 years ago, there was a rash of changes to these PAS units
, changing out the switch mechanism ruining the separate phono and line level
ground systems for the new look, and several "bootleg" back panel labels
with various PAS, PAS2, PAS3 designations.
at that time, I traded my collection of TAS for a pair of PASs, and noticed the only difference
was the green caps and asked the original owner who informed me of the differences and
told me about the silver faceplate option. Since I joined eBay in the early days, I would
download the pictures of any PAS being sold, and they continue to confirm that green
caps were the transition from PAS 2 to 3, the brass units shells being emptied out
of inventory independently.
Faceplate options come up in eBay and other places. I have seen the one in black I
or white and I think it's the best option since the silver ones get beat up (easily). If I kept them,
I'd refinish the brass (because it's engraved) with black powder coat, and fill in
the engraving with red.
As far as I have seen through the decades, aside from the X designation, there's
no one else who IDs these by the green caps.
I would love to see an original one owner PAS with original silver face plate without the
green caps but with provenance. You're talking about someone who bought their PAS
in the 1970's since David Hafler left/sold dynaco and started Hafler in the early 80s'.
back in those days, you could pickup dynaco tube equipment for chump change.
and people knew what sold so the silver faces were "sought after"
(flipper top ten phrase) and lots of stuff was "re-manufactured". If you ever see
a brass PAS with blue LED, it was one of several I sold on eBay. Sampling
one or two and drawing conclusions makes it dicey to generalize.
Not trying to change the myth system but trying to change the path of the stampede.
there was an option from Dynaco for the new silver face. Pas2/3 distinction is
with the green caps not the color of the face plates.
otherwise you would see PAS3 with the silver faceplates and NO green caps if they
were that interchangeable. (if you do then the faceplate was replaced but see below)
Another one of those telefunken smooth plate 12ax7, and cloth covered transformer
leads myths created by consensus.
back about 30-35 years ago, there was a rash of changes to these PAS units
, changing out the switch mechanism ruining the separate phono and line level
ground systems for the new look, and several "bootleg" back panel labels
with various PAS, PAS2, PAS3 designations.
at that time, I traded my collection of TAS for a pair of PASs, and noticed the only difference
was the green caps and asked the original owner who informed me of the differences and
told me about the silver faceplate option. Since I joined eBay in the early days, I would
download the pictures of any PAS being sold, and they continue to confirm that green
caps were the transition from PAS 2 to 3, the brass units shells being emptied out
of inventory independently.
Faceplate options come up in eBay and other places. I have seen the one in black I
or white and I think it's the best option since the silver ones get beat up (easily). If I kept them,
I'd refinish the brass (because it's engraved) with black powder coat, and fill in
the engraving with red.
As far as I have seen through the decades, aside from the X designation, there's
no one else who IDs these by the green caps.
I would love to see an original one owner PAS with original silver face plate without the
green caps but with provenance. You're talking about someone who bought their PAS
in the 1970's since David Hafler left/sold dynaco and started Hafler in the early 80s'.
back in those days, you could pickup dynaco tube equipment for chump change.
and people knew what sold so the silver faces were "sought after"
(flipper top ten phrase) and lots of stuff was "re-manufactured". If you ever see
a brass PAS with blue LED, it was one of several I sold on eBay. Sampling
one or two and drawing conclusions makes it dicey to generalize.
Not trying to change the myth system but trying to change the path of the stampede.
s-petersen
Scott
According to the Regenesis pdf this is certainly a 3x
Yup!
T68
Super Member
Hi!
Totally new on tubes. And a novice on audio gear in general. Just recently got a Little Bear T10 phono preamp which has piqued my interest in this tech.
Now I might be onto a Dynaco Pas. But if I understand right this is not an amp that I can connect speakers to. Is this correct?
What would be a fitting equipment or amp for this? Can I connect it to the aux input on my solid state amp? Or is this mixing of tubes and solid state blasphemy?
Thankful with any help with this (stupid) questions.
Totally new on tubes. And a novice on audio gear in general. Just recently got a Little Bear T10 phono preamp which has piqued my interest in this tech.
Now I might be onto a Dynaco Pas. But if I understand right this is not an amp that I can connect speakers to. Is this correct?
What would be a fitting equipment or amp for this? Can I connect it to the aux input on my solid state amp? Or is this mixing of tubes and solid state blasphemy?
Thankful with any help with this (stupid) questions.
nj pheonix
Lunatic Member
PAS is a preamp.
You are correct. You cannot connect to speakers. You'd need a power amp of some kind.
There is an audio Regenesis website that is an excellent resource if you want to learn about the dyna/PAS pieces
You are correct. You cannot connect to speakers. You'd need a power amp of some kind.
There is an audio Regenesis website that is an excellent resource if you want to learn about the dyna/PAS pieces
This is a tube preamp, a historic and with it's limitations a very good preamp.
One limitation is that the output can only drive ( in stock version) an amp with at least 250kohm
impedance, preferably 500k. Your solid state amp probably have much less impedance. Read the
specification to be sure.
PAS can however drive as low as 50k input is some resistors inside is adjusted/removed. See
rennenkamp articles for this.
There is nothing wrong with mixing tube and ss gear, although full benefit of the tubes
will only be achieved if there is a full tube chain. In your case, a dynaco st-35 or st-70
would be a perfect combination.
