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In Reply to: RE: Need help with RIAA mod cap values (PAS 3) posted by petercapo on February 19, 2015 at 06:45:59
Wow! This has been the most challenging (confusing) unit to wrap my head around, I think because there is so much lore and so much written about/done to this little preamp.
So I guess Audio Regen and Curcio don't agree on this one. I respect both sources, though it looks like AR's (published) research is more exhaustive on this point.
I'll just drop in my tubes4hifi stock circuit replacement boards and run them for a while unmodded and see what it sounds like.
Thanks for that link!
Follow Ups:
I should add that the challenge (confusion) for me is mostly about what mods to do and at what point I'm not listening to a Dyna PAS. For me, I think the Z-mod is a step too far. I'll stick with stock boards and do my little jumper/clipper mods (tone control, output loading) along with replacing some off-the-board passives with same spec (Volume/balance pots, caps, resistors) and run with it for a while. Maybe the selector switch down the road.
I think if you retain the basic circuit topology of the original, you're listening to a Dynaco. That is, even if you excise the bells and whistles, like the tone controls and such, and even if certain enhancements are added, like increasing the capacitance in the power supply or if individual parts are upgraded in quality.I'd say it ceases to be a Dynaco if the PC boards are replaced with a different circuit or if you go to a different kind of power supply.
Edits: 02/19/15 02/19/15
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