If anyone has performed the RIAA EQ mod to their PAS2, could you please advise on proper capacitor matching, suggested brands, AND parts numbers if you used a vendor ? (ie. Digi-key,...no affiliation.)
Thank you!
Thank you!
3 posters
RIAA EQ Mod - PAS 2
8xlaxx- Posts : 18
Join date : 2016-12-10
j beede- Posts : 473
Join date : 2011-02-07
Location : California
I purchase the majority of my capacitors from Antique Electronic Supply. Excellent inventory, excellent service, no minimum. They sell the usual industrial brands--Sprague, Illinois, Mallory, CE, Solen, and others. Heads up: I discovered that the labeling on some CE types could be damaged/removed by common solvents.
The caps you will need are inexpensive. Buy more than needed and then "match" values using a simple cap meter. If you intend to use the stock PCB (or clone) you will probably find that many boutique brands take up too much space. I was unable to find every exact value so installed some paralleled sets--one cap on top of the PCB, one below. It worked out well.
I found that getting rid of that input selector "rat's nest" and the miserable caps located on it was the single best upgrade to the PAS. That preamp now operates without crosstalk--like a "real" preamp.
The caps you will need are inexpensive. Buy more than needed and then "match" values using a simple cap meter. If you intend to use the stock PCB (or clone) you will probably find that many boutique brands take up too much space. I was unable to find every exact value so installed some paralleled sets--one cap on top of the PCB, one below. It worked out well.
I found that getting rid of that input selector "rat's nest" and the miserable caps located on it was the single best upgrade to the PAS. That preamp now operates without crosstalk--like a "real" preamp.
peterh- Posts : 1869
Join date : 2012-12-25
Location : gothenburg, sweden
8xlaxx wrote:If anyone has performed the RIAA EQ mod to their PAS2, could you please advise on proper capacitor matching, suggested brands, AND parts numbers if you used a vendor ? (ie. Digi-key,...no affiliation.)
Thank you!
What RIAA mod are you talking about ? is it :
http://www.curcioaudio.com/Dynaco%20PAS%20RIAA%20EQ%20Correction%20Mod.pdf
Then read :
http://www.audioregenesis.com/documents/PAS_Phono.pdf
and then enjoy your PAS2 "as is"
8xlaxx- Posts : 18
Join date : 2016-12-10
Thank you Peter. I thoroughly read the article. The screwdriver is staying put on the bench. Will just have to sacrifice the Tape Out low-end frequency compromise/response.
Again, appreciate the link.
Again, appreciate the link.
j beede- Posts : 473
Join date : 2011-02-07
Location : California
Regardless of what you do regarding the RIAA circuit... by all means replace your input selector and its associated wiring. If you are still running the stock power supply--that needs to go too.
Replacing the input selector is an ideal time to replace the stock RCA I/O board. This is not a trivial job but makes the PAS perform like a much more modern preamp.
Replacing the input selector is an ideal time to replace the stock RCA I/O board. This is not a trivial job but makes the PAS perform like a much more modern preamp.
peterh- Posts : 1869
Join date : 2012-12-25
Location : gothenburg, sweden
Why replace the input selector ? Motivate please.j beede wrote:Regardless of what you do regarding the RIAA circuit... by all means replace your input selector and its associated wiring. If you are still running the stock power supply--that needs to go too.
Replacing the input selector is an ideal time to replace the stock RCA I/O board. This is not a trivial job but makes the PAS perform like a much more modern preamp.
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