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Old 10th October 2007, 07:21 AM   #21
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Quote:
Originally posted by Zen Mod
ball ?
More/better pictures.

There are only 4 MOx power resisors between the heatsinks.
The SCG devices are not mounted on both sides of the heatsinks, like regulator devices in some of Krell's pre-amp models.
Between the capacitor bank and the heatsinks : a parallel TO92 VAS pair, a silvermica cap, again a pair of TO92 drivers in parallel.
There's no bipolar cap visible for DC-blocking in the NFB path, no DIP8 opamp.
There are too many small signal devices in the front end for the TO-5 to be the input stage, a metal can LF411 is the first to come to mind.
That also explains the small green foil cap adjacent to the TO-5 critter.
No zeners visible in the front end, the device count suggests a front end a la KSA with all-bjt semi shunt voltage regulators and CCS's.

Complementary differential input + parallel VAS pair + parallel driver pair=> 300i
Could be the reason why the KSA-5 doesn't live up to expection, as the very first real sota Class A SS headphone amp you'd expect it to be a benchmark.
Sounds pretty good through a high efficiency large loudspeaker system. heard the KSA-5V on bigga bucka Alfred Rudolph horns.
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Old 10th October 2007, 05:48 PM   #22
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oh man.... nothing probaly out of this one....oh well, back to my drawing board..... simulator
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Old 10th October 2007, 06:39 PM   #23
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You can always assemble yourself a High Resolution Self to Blame.
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Old 14th November 2007, 08:28 PM   #24
kamis is offline kamis  Serbia
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Jacco,could you elaborate more about Krell all bjt semi-shunt regulators and CCS. Any schematic?
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Old 14th November 2007, 09:06 PM   #25
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by kamis
Jacco,could you elaborate more about Krell all bjt semi-shunt regulators and CCS. Any schematic?

why you need that ?
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Old 14th November 2007, 11:06 PM   #26
kamis is offline kamis  Serbia
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Zen Mod,I am interested in older high end solid state preamps and power supply topologies and how to incorporate good designs ideas in my own projects. Also, i like to compare them to more modern approaches.BTW term "semi shunt" is unknown to me.
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Old 14th November 2007, 11:28 PM   #27
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by kamis
Zen Mod,I am interested in older high end solid state preamps and power supply topologies and how to incorporate good designs ideas in my own projects. Also, i like to compare them to more modern approaches.BTW term "semi shunt" is unknown to me.

well , maybe I'm not so well informed , but I can't see much differences between modern and old good preamps ;

differences in topology between various manufacturer are obvious, but I can't place them in time frame ;

anyway - that's not really issue

like you - I'm always interested to see new (to me ) schematic ; I resume that's more passion than anything else .

"semi shunt" ......... Jacco is always playin' with words ............ dunno what is that......

most interesting shunt reg I saw lately on DiyA is certainly reg for driver stage in this thread

hehe , not counting Shunty ........ from obvious reasons - it is fave to me
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Old 15th November 2007, 10:27 AM   #28
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Quote:
Originally posted by Zen Mod
playin' with words
Correctomundo.
A common use for a zener diode is as shunt voltage regulator, exchange the zener by a bjt circuit and you have a semi-shunt.
As in semi-conductor, not pseudo. (Krill is boring, word and mind games are not)
Seems that Mihai joined the exotic nfb number club.
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Old 1st June 2010, 11:47 PM   #29
wayne is offline wayne  United States
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I have a schematic for the KSA-5. Any interest?
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Old 2nd June 2010, 12:10 AM   #30
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Interested.
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