upgrading JADIS JA-200, JPS2 and JPS3

Jadis models last for many years - your JA-200 was introduced more than 20 years ago and the circuit dates from the 60's - I have the schematic of the original Loyez amplifier in a Millerioux application note from 1966. The type of capacitors changed during its life.
Using better electrolytic capacitors will surely improve the performance of your units, but the choice of signal capacitors are less obvious - they will sound different but it is very difficult to foresee what will be the effect in your system.
Some people I know and respect enjoy putting V-caps in Jadis and claim a much better performance, but I never compared them with standard units. Also, most high quality capacitors need 200-400 hours burn in time before they reach a stable sound, making decisions less clear.
How old are your units?

Thegreathunter007 ..Do your self a favor and call Brooks Berdan in Monrovia CA.He is Jadis as they say!!.Ask him what happens when you replace something as simple as caps with non original Jadis..

Hi Microstrip, my units date from before I purchased them in 1994... at this time there was not even a protection fuse! I use old Kimber KCTG interconnects and a Kimber black pearl speaker cable with maggies 3.5 (sorry, I went to Africa eight years and did not follow technological innovations>>>joke)
Even Jadis folks evolve, for their new anniversary version of the 80 family they changed a few things, including capacitors (they look yellow...)...
Would be interesting to know which of these upgrades can be applied to the other models!

Hi,
I have read modification examples published on the net:
http://www.high-endaudio.com/Modifications.html#Pre
concerning preamps (example given of JP-80) and power amps (example given on golden tube 300B amp) and would like to know what you think about applicability to jadis equipments, in particular JA-200, JPS 2 and JPS 3 and if somebody tried anything suggested on this site for mods

Since the JPS2 is essentially the line stage of the JP80 (not sure how the extra tube for the CD input fits in, though, if you have it in your preamp), Arthur's mods for the JP80 should be applicable for that unit, though I'd want a qualified technician to confirm that. If your hearing and listening biases are similar to Arthur's, you might like the difference.

What is the JPS3? Is that a standalone phono stage? Never saw it here in the states.