I would also consider increasing the voltage for the higher output power (if needed). Mine is singing without any problems last several years at secondary TR voltage of 2 x 22V. The included picture is old, now it is run as dual monoblocks in identical case and with second PS.
http://www.diyaudio.com/forums/pass-labs/186848-babelfishing-mighty-ar2.html
http://www.diyaudio.com/forums/pass-labs/186848-babelfishing-mighty-ar2.html
Power is not really a problem but if the extra voltage gives them a sonic edge then, why not?
Even though I see the mighty ZM holds you in HIGH regard I will wait to get his permission for such a thing. He knows my limitations ...
Thanks for the idea.
Even though I see the mighty ZM holds you in HIGH regard I will wait to get his permission for such a thing. He knows my limitations ...
Thanks for the idea.
You don't get membership to ABFAB by asking permission.
Tell those bastards who is the boss. Just build it, and have 5 multimeters, 2 soldering irons, and 3 fire extinguishers all ready to go.
Something like that anyway.
😀
Tell those bastards who is the boss. Just build it, and have 5 multimeters, 2 soldering irons, and 3 fire extinguishers all ready to go.
Something like that anyway.
😀
I hope ZenMode would remember or know. It has been really long time we did it. I would be glad to make a reading and let you know, but I am flying tomorrow morning on a short trip and will be back on June 14th. If Zen cannot figure it out until then, I will measure and post answer here upon my return.
If I could point on something, my problem was that I did not install in the first place the right sized LEDs, and after we corrected for it, all was fine. So read carefully about LEDs and purchase exactly the one specified.
I think that rickmcinnis plan is to build separate psu but still utilizing same chassis. Increasing psu voltage will be toooo hot for factory chassis, unless current draw is reduced, which is not an easy task on original J2.
hmm, back to my first suggestion, keep your original J2 and build a clone if you want to jump into real DIYaudio. then you can play with manyyyy iteration and possible permutation with your wildest mind. but again as gerd has mentioned, will it be better then J2 which is cooked by the master?
nope , just checked - it's plain simple 1A65 CCS
not just that
ZM is AR2's Padawan
😉
however - important difference - what AR2 is having (as somewhat more potent iteration) is Babelfish J2 , which is having cascoded front end LTP , meaning that input JFets are having voltage (thus dissipation ,too) umbrella ; factory J2 is not having that , so upping rails voltage would be as howling a Devil , especially taking in account that in your J2 there also are JFets as small CCS for input LTP, connected across entire rail
Papa did that few times , but I wouldn't ..... me being cheapskate and woosie
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So the resistor input supply has a little more ripple but you lose a capacitor in a position that makes the rectifier work harder than it needs to along with the fact that the resistance makes life easier still on the rectifier.
I think that is the one I will build first.
I agree one needs to build something!
I think that is the one I will build first.
I agree one needs to build something!
No, just a clone.
Ok, went from CNY17-4 to CNY17-1. It seems to die on transients with low frequency content, if my memory serves.
Ok, went from CNY17-4 to CNY17-1. It seems to die on transients with low frequency content, if my memory serves.
not so sure that your problem lies there ......... though , not that I have enough info
however , CNY17-1 is having much lesser CRT (vs.CNY17-4) , so any hickup happening on observed side is lesser amplified to governing side
however , CNY17-1 is having much lesser CRT (vs.CNY17-4) , so any hickup happening on observed side is lesser amplified to governing side
... meaning lesser current draw through the output stage? That is what I am hoping to achieve - a cooler amplifier.
nope , if there is difference , it'll be the other way
stay with 17-4 , sort those drek pcb traces
stay with 17-4 , sort those drek pcb traces
I don't know how much influence that Stereophile has today, but it is nice to see FW review on this magazine. Their measurement part is always interesting. Thank you. 🙂