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Challenge: Can an Aleph J-ESL be built?
Challenge: Can an Aleph J-ESL be built?
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Old 2nd March 2019, 04:22 PM   #1
mats31 is offline mats31  Sweden
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Default Challenge: Can an Aleph J-ESL be built?

Three things makes me ask this question (it is a challenge really).
If Mr. Pass himself would comment , I would be honoured.

1. I'm totally impressed by the midrange/treble you get from the venerable QUAD ESL 57 (and other ESLs as well to some degree)

2. The Aleph J produces a very sweet and musical sound connected to ESL57s.

3. Still I would guess that the speaker transformer that converts the amp output voltage 1:270 for the bass panels and 1:90 for the midrange/treble panel does take away some of the potential sound quality.

Assuming that the midrange/treble is the most critical for perceived quality, how would an Aleph J-ESL be designed to 'direct drive' the midrange/treble part?
Very often midrange/treble protection is installed in these ESL57s to clamp the peak voltage to 2,200 Volts (using a chain of zeners), so that gives the amplifier peak voltage output needed to utilise the full (about) 103 dB potential.

So instead of +-24 Volts the Aleph J-ESL needs roughly a +- 2400 Volt PSU, scaling everything a factor of 100.

Cascaded expensive HV transistors, but maybe not more exotic than VFETs....how would it be designed?? Just a quick search gives STP4N150 - MOSFET N, 1500 V 4 A 160 W TO-220 @USD 6.00. Use of beeswax insulation (nice smell) and making ball-shaped solder connections to avoid corona discharge would bring a new dimension to Pass amps....

I'm fully aware that this thing would be totally lethal and also completely DIY-unfriendly. Bleeder resistors in the PSU would be a life vs. death detail....

But.... what don't we sacrifice for the ultimate sound experience? :-)

Curious,
/M

Last edited by mats31; 2nd March 2019 at 04:51 PM. Reason: spelling...
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Old 2nd March 2019, 04:57 PM   #2
Zen Mod is online now Zen Mod  Serbia
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Challenge: Can an Aleph J-ESL be built?
to make it short and sweet - take ordinary Aleph and connect it to Quad ESL57 inputs

then disconnect QuadESl57 panels and connect those wires directly to your ear lobes

experience will be even more direct , even with funny xformers still in picture

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Old 2nd March 2019, 05:07 PM   #3
Blk Dynamite is offline Blk Dynamite  United States
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Out of curiosity, for a panel that’s run from maybe 230hz on up, would 50-75 watts be sufficient for high SPLs?
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Old 2nd March 2019, 05:08 PM   #4
mats31 is offline mats31  Sweden
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Serbian electrocution. :-)
Can I decide the tune... We will rock you//Queen to make it really short and sweet
:-)
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Old 2nd March 2019, 05:11 PM   #5
mats31 is offline mats31  Sweden
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I think the 25-30 W as the stock Aleph J would absolutely be good enough.
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Old 2nd March 2019, 05:48 PM   #6
indra1 is online now indra1  Indonesia
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Quote:
Originally Posted by mats31 View Post
... Very often midrange/treble protection is installed in these ESL57s to clamp the peak voltage to 2,200 Volts (using a chain of zeners), so that gives the amplifier peak voltage output needed to utilise the full (about) 103 dB potential.

So instead of +-24 Volts the Aleph J-ESL needs roughly a +- 2400 Volt PSU, scaling everything a factor of 100. ...
2,200 V peak (4,400 Vpp) could be doable, not sure for 2,400 V peak (4,800Vpp)
Quote:
... But.... what don't we sacrifice for the ultimate sound experience? :-) ...
Let's see how much sacrifice you are willing to do to reward the one who meets your challenge.
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Old 2nd March 2019, 05:57 PM   #7
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Challenge: Can an Aleph J-ESL be built?
that Aleph could be best if built with GM70 or 845 in OS , with appropriate bottles in front
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Old 2nd March 2019, 06:37 PM   #8
mats31 is offline mats31  Sweden
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@
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that Aleph could be best if built with GM70 or 845 in OS , with appropriate bottles in front
Yes, what I describe has been done with tubes (and with amazing results achieved -- at least stated as amazing). The challenge is how to build it with SS technology.
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Old 2nd March 2019, 06:50 PM   #9
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Challenge: Can an Aleph J-ESL be built?
why?

horses for courses

I had my hands and head enough times inside of FM transmitter , equipped with mighty triode working on 3K5Vdc , so pretty much spent all of Exorcism I had left

though , I believe this place is wakoo enough** , so counting that you'll find accomplices for adventure ........

**reason why I'm furniture here

anyway , take care ....... to know what you're doing in every step ....
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Old 2nd March 2019, 07:06 PM   #10
indra1 is online now indra1  Indonesia
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... The challenge is how to build it with SS technology.
Are you posing a challenge or asking for a donation?
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