peterh wrote:I contacted the seller "re-engineer" and asked if the potentiometers in the
pas potentiometer kit. Did they have correct values .
The answer was not to my satisfaction :
The question you're really asking is:
Are they the same resistance as the
The answer is:
If they were, there would be no need for the
Thanks for stopping by...C
In other words he refuses to tell what he sells.
Maybe better to skip this seller.
Adnick wrote:I’ve used several of the Dynacodesign tone kits in PAS builds, they work and replicate they original circuit very well.....
Does it appear as if the Dynaco Designs tone control circuit uses the same value potentiometers and associated parts as the original Dynaco circuit? Not sure in what sense it "replicates" the original circuit, other than simply providing a tone control function. If it uses different value parts, I don't see how it can truly replicate the effect of the original. How "well" the Dynaco Designs tone control circuit works is a reasonable question.
It's good to have options. However, given that the performance of the PAS line stage depends on the value of the pots and their associated tone control parts, I'd really like to see complete line stage performance specifications published for an aftermarket tone control circuit change like this one. It should then be vetted by an outside lab in order to understand how it alters the performance of the PAS line stage.
For anyone who might be interested, here's an engineering study of the original PAS line stage that includes discussion of the original PAS tone control function http://www.audioregenesis.com/documents/PAS_Line.pdf
With regard to changing the value of tone control circuit parts in the PAS line stage, notice comments in the last paragraph of the following post by Audio Regenesis https://audiokarma.org/forums/index.php?threads/dynaco-pas-tone-control-%E2%80%9Ctuning%E2%80%9D.919539/#post-13906489
Quoting at this time from the post by Audio Regenesis at the link immediately above: "Even with non X versions, altering the values of the pots necessarily must alter the performance since the they, especially the bass pot, are an integral part of the unusual TC implementation. Any changes will also alter the very specific output loading requirements of the circuit as well as (likely) degrading other performance parameters."
Last edited by PeterCapo on Mon Jul 20, 2020 10:14 am; edited 2 times in total (Reason for editing : add quotation, clarification)