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Old 13th May 2006, 06:28 PM   #1
jeapel is offline jeapel  Canada
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Join Date: Sep 2003
Location: quebec
Default final aleph 3 sound test

hi
I just finish sound test on my new aleph 3 + tube preamp setup
and the sound is very good.

technical details:
-one transfo for both channels + 2 x 35A bridge +2 x 68000uF
-after separate LC sections for right and left
-total cap 408000uF +4 x 1.2mH
-25 v rail and 2A bias
-power supply ripple is 25mV
-hum is very low
-oversize heatsink for around 40C to 45C after 3 hrs
-exactly 50% ac gain

-6SN7 5ma ccs gain=20
-6AS7 70ma cathode follower (beefy buffer :-)) gain=.5 zout=100ohm
-total gain=10
-transistor HV regulator for low hum
-ac heater with 2x 33ohm to ground on heaters
-more hum with preamp ON but it s ok

my question is:

If i understand aleph 3 give second harmonic like tube
and for me a tube preamp is the natural way to go but
don t seem very popular on diyer so i would like
to get all your feedback , test, opinion, on
(tube preamp) vs ( ss preamp like boz) to drive aleph amp
for consequences on the sound

thanks
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Old 15th May 2006, 08:22 PM   #2
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Opinion varies widely, but there is good acceptance for
both tube and solid state with this amplifier.
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Old 15th May 2006, 11:54 PM   #3
jeapel is offline jeapel  Canada
diyAudio Member
 
Join Date: Sep 2003
Location: quebec
First Mr Pass thanks for your public aleph schematic
i m very happy with the result.

So i m not complely wrong with my tube preamp but
with just one answer i feel lonely :-) maybe next
winter i will follow the main current with boz preamp
or maybe there is a new jfet preamp on the design
board like the new jfet power amp.
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Old 16th May 2006, 08:14 AM   #4
Phill is offline Phill  France
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Join Date: Nov 2003
Location: France dand le sud
hello

I have a aleph 5
http://domainedupossible.free.fr/pag...H5/aleph51.htm

I feed it with a preampli with lamp : the KTR
http://domainedupossible.free.fr/pag...reKTR/ktr1.htm
http://www.isasarl.com/ and "publication"

the result is very good. much life, much space, I like much...
I arranged my bosoz in a paperboard

Phill

excuse my English…
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Old 16th May 2006, 01:22 PM   #5
jeapel is offline jeapel  Canada
diyAudio Member
 
Join Date: Sep 2003
Location: quebec
hi

Comparative between bozoz , ktr, kaneda
it s very interesting.

Merci Phill je vais tout lire cette semaine
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