Back then, when it—nakamichi stasis 7 that is—was fresh on the marked, I was forced to make a 30‘ detour on my way home from school just to drool at the window where it was displayed...
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Such a good looking amplifier!!! One of my favorites as well.
Nakamichi PA-7 Amplifier – Old School | TONEAudio MAGAZINE
This article is dated, I doubt you could touch an inoperative one for $600...
Nakamichi PA-7 Amplifier – Old School | TONEAudio MAGAZINE
This article is dated, I doubt you could touch an inoperative one for $600...
what was that mistake/omission - they made with one of Naka Stasis amps, so circuit sounded much worse ?
read about it somewhere, was one cap in question or something like that .......
read about it somewhere, was one cap in question or something like that .......
Sitting on the sideline, contemplating how greed has now gone retro. Amusing to see Nelson’s and Zen Mod’s gluteus maximus being thoroughly osculated.
And when I read „stasis“ here, I first thought of the naka, my heart stood still. (From time to time there is a naka pa7 for sale, in working condition and just a bit over 600.)
Of course, the threshold stasis must be much better.
Of course, the threshold stasis must be much better.
Some people didn't like Nak's choice of only 10uF for the feedback cap. Factory bias recommendation was too light also at 40ma per device. I have my PA-5 set for 125ma per device and heatsink temps are well below 50C.
Sitting on the sideline, contemplating how greed has now gone retro. Amusing to see Nelson’s and Zen Mod’s gluteus maximus being thoroughly osculated.
as I'm always saying - blame Pa......
When you think about it, in their day both the Threshold and Nakamichi designs were good looking amplifiers. The ultimate would be to put the true original Threshold design in the Nakamichi PA-7 enclosure.
Nelson is always very accommodating. And for bravely resisting "Babelfishing" the Stasis I am really proud of you! It seems as if the 12-step program is working for you.
I want to build this project but have a couple very basic questions related to ordering the PCBs. I have designed PCBs using KiCAD and had them fabricated by OSKPark. When I try to upload the gerbers from Zen Mod I get 2 error messages from OSHPark:
no silkscreen file found
no board outline file found
Can someone point me in the right direction? Thanks.
no silkscreen file found
no board outline file found
Can someone point me in the right direction? Thanks.
I have ordered the new Stasis FE and OS pcb's by Zen Mod at JLPCB in Hong Kong, and all gerber files uploaded with no problems and all files approved for manufacture. They do a good job with quick delivery and their prices are also very competitive as well - check them out.
I also tried PCBWay, that Nelson uses, again all files uploaded fine , but their price overall for the order and delivery was a lot higher than JLPCB. So I canned that order.
I also tried PCBWay, that Nelson uses, again all files uploaded fine , but their price overall for the order and delivery was a lot higher than JLPCB. So I canned that order.
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original Papa's FE Gerbers - I had some difficulties with *.brd file, both at JLCPCB Gerber viewer and with VisualCAM in my PC
when I renamed it to *.fab, everything is OK for me, and I could edit, to add mounting holes
when I renamed it to *.fab, everything is OK for me, and I could edit, to add mounting holes
OSH Park want files to be specific naming or site would not understand.
See what I did with Mr. Pass gerbers to work in OSH Park.
Files renamed and reziped:
STASIS FE.TOP to top.gbr (top copper layer)
STASIS FE.BOT to bottom.gbr (bottom copper layer)
STASIS FE.TSL to top_silk.gbr (top silk screen)
STASIS FE.TSM to top_mask.gbr (top solder mask)
STASIS FE.BSM to bottom_mask.gbr (bottom solder mask)
STASIS FE.BRD to outline.gbr (board outline)
STASIS FE.DRL to Through.drl (drill template)
It will staill say "Your project doesn't contain a bottom silk screen."
But that is okey.
If you do the same for ZenMod OS then don't forget to check on order "2 oz copper, 0.8mm thickness".
Cool Stasis FE pcb gerbers is ready available in post # 1
Thanks to the One and only Mr. PassWork
Could be possible share pcb Stasis archive gerbers of the power output stage ready made in the past?
The word "gerber" hadn't been invented yet when the Stasis were first designed. 😀 This is why Nelson decided to design the new front end for the old Stasis we were repairing as there were no gerbers for the FE boards. The original Stasis outputs are all TO-3 and the output boards in mine are massive, with 24 outputs per channel.
Cheers
I agree that it would be really cool. 😀
But here’s the practical considerations as why it is likely a dead end -
1) Many suitable output devices are available in TO-247/TO-3P. Few are available in TO-3.
2) Keeping the output devices TO-247/TO-3P allows you to use essentially any flat sided heatsink with single mounting holes, whereas TO-3 requires 4 holes per device, and much more importantly, the ability to get to the bottom of the package as that’s were the pins are located.
3) The TO-3 mounting will make the case requirements even more onerous, greatly increasing the price to build one, as well as severely limiting currently available off the shelf solutions.
4) Might ZM (or somebody else) would have to layout another PCB or two.
5) TO-3 package devices are more expensive with little to no practical advantage.
6) The PCB as currently designed will allow trying Mosfets in the output stage.
Yes, I agree it would be really neat and look super cool. If that is enough justification to do so in your mind, by all means explore it and post your photos here! I’d love to see it.
But here’s the practical considerations as why it is likely a dead end -
1) Many suitable output devices are available in TO-247/TO-3P. Few are available in TO-3.
2) Keeping the output devices TO-247/TO-3P allows you to use essentially any flat sided heatsink with single mounting holes, whereas TO-3 requires 4 holes per device, and much more importantly, the ability to get to the bottom of the package as that’s were the pins are located.
3) The TO-3 mounting will make the case requirements even more onerous, greatly increasing the price to build one, as well as severely limiting currently available off the shelf solutions.
4) Might ZM (or somebody else) would have to layout another PCB or two.
5) TO-3 package devices are more expensive with little to no practical advantage.
6) The PCB as currently designed will allow trying Mosfets in the output stage.
Yes, I agree it would be really neat and look super cool. If that is enough justification to do so in your mind, by all means explore it and post your photos here! I’d love to see it.