Aleph preamp

[Nickolas K.]

Aleph Ono + Aleph L

 

[Nickolas K.]

inside

 

[Nickolas K.]

side view

 

[Nickolas K.]

from the other side

 

[Nickolas K.]

rear view

 

[jleaman]

Very Very Very Nice.. Great Job man..

 

[JOE DIRT®]

Nice work!!...thanks for sharing it with us

DIRT®

 

[moe29]

what's with the red LED's??


...otherwise that is some SERIOUS DIY

any info on your voume control? external power supply?

thanks for sharing!

 

[Mad_K]

Verrrrrry nice methinks...

 

[Piersma]

Preamplifier

Nikolas, well done !

Nice and very neat looking preamp, thanks for sharing it with the DIY community.

 

[panos29]

Excellent!

Nikolakh, egrapses!

Super quality! very nice pcbs and in general very neat constuction. so I guess that makes 3 of us (Greeks) with aleph Ls!
Tell us your experience with sound and also what are you driving with this?

Regards,

Panos

 

[Nickolas K.]

moe29

Leds are red in standby mode and turn green in operate mode.

Volume control is based on Elma 04A2A00 and the resistor values are the ones mentioned in the "L" schematic.

Here are some pics of the ps.

 

[Nickolas K.]

another one

 

[Nickolas K.]

and the last one

..... forgot to mention, there is no power switch, the preamp is always in standby mode.

Nick

 

[jh6you]

You must be an expert diyer. Great.

By the way I have two questions:

Any special reason why EI transformers?
Any reason why always in standby mode (does it take long time from the switch-on to the best sound)?

Thanks.

JH

 

[moe29]

i knew that power supply would be nice!

what more can we say? simply excellent work Nick!!

...i guess i can let the blue LED slide just this once


moe29

 

[Nickolas K.]

jh6you

The transformers are 160 VA each, Split-Bobbin types without Faraday shielding.
There is no hum, no buzzing, no voltage drop under load and the preamp sounds huge and very relaxed.

If not in standby mode the pramp needs about 1 hour from turn on to sound at its best.
Original Aleph preamps were fitted with an on-off switch???

Nick

 

[Mad_K]

Re: jh6you

If not in standby mode the pramp needs about 1 hour from turn on to sound at its best.
Original Aleph preamps were fitted with an on-off switch???

Nick

I agree one the 1 hour (atleast)

I don't think they had a power switch. As I recall Nelson saying he reconed the customers wouldn't use it anyways -And it is not in the schematics..

(By BZLS hasn't got a power switch either. Not my VERY hotroded CD63KI either (with 3 psu's) -They are on as long as I am home/awake

 

[jh6you]

Re: jh6you

... very relaxed.

Hi, Nick

Thanks for the response.
Personally, I prefer EI (well made) to toroidal for the same reason, not due to technical reason.

JH

 

[jh6you]

I agree one the 1 hour (atleast)

Mad stands for Madsen?

Do you have the standby mode for the power amp, too?
If so, through which part the live-current flows in the stanby mode?

JH