Classic Aleph Amplifier for Modern UMS Chassis Builder's Thread

[Dennis Hui]

Ohhh....very nice Dan.

 

[Vunce]

Sweet speakers Dantwomey🤩

 

[dantwomey]

My ohmmeter says Mike's idea was an exceptional one. I put nylon shoulder washers on both ends of my transformer mounting bolts.

Regards,
Dan

 

[poseidonsvoice]

Nice inexpensive fix! Great work and thanks for the idea Mike!

Best,
Anand.

 

[Mikerodrig27]

Very cool! I'm really happy it worked

 

[dantwomey]

My first measurements. I attribute the super low DC offset to Randy's exceptional matching skills.

Regards,
Dan

 

[Mikerodrig27]

What is the toughest speaker you guys have driven with your Alephs? I have a friend who wants me to build an amp for him and likes the idea of single-ended class A. Thinking Aleph 2's

 

[Mikerodrig27]

My first measurements. I attribute the super low DC offset to Randy's exceptional matching skills.

what offset did you land on once everything was to temp? Those matches are pretty good.

 

[dantwomey]

This is my first Aleph and it hasn't gone into use yet. Hoping in a month or so.

Regards,
Dan

 

[rhthatcher]

What is the toughest speaker you guys have driven with your Alephs? I have a friend who wants me to build an amp for him and likes the idea of single-ended class A. Thinking Aleph 2's

@tonyEE is running power hog Maggie’s with A2’s

 

[tonyEE]

Actually, the A5s drive the Maggie 1.7s well... but the A2s drive them much better -dynamics-.. not only do they play louder but there's a lot more bass coming of the speaker, it feels like an added octave in there.

It's not subtle.. you just NEED power... The First Hundred Watts matter sometimes.

 

[rhthatcher]

This is my first Aleph and it hasn't gone into use yet. Hoping in a month or so.

Regards,
Dan

Month or so!?!?

 

[Mikerodrig27]

Very cool. thank you!

 

[sumoking]

What is the toughest speaker you guys have driven with your Alephs? I have a friend who wants me to build an amp for him and likes the idea of single-ended class A. Thinking Aleph 2'

Actually, the A5s drive the Maggie 1.7s well... but the A2s drive them much better -dynamics-.. not only do they play louder but there's a lot more bass coming of the speaker, it feels like an added octave in there.

It's not subtle.. you just NEED power... The First Hundred Watts matter sometimes.

tonyEE… if you had a chance to start over would you still get the Aleph 2 mono blocks?
Thank you.

 

[dantwomey]

what offset did you land on once everything was to temp? Those matches are pretty good.

On the above chart. Almost single digits.

Regards,
Dan

 

[Mikerodrig27]

I see. I was reading the chart wrong. Really nice!

 

[dantwomey]

Month or so!?!?

Thinking of changing my bridges. Current ones are running 85-90C.

Regards,
Dan

 

[Vunce]

Dan,
Active rectification is the only way I go for Class A builds. The benefits far outweigh the higher cost.

 

[dantwomey]

My current bridges have a Vf of 2.73vdc.

Regards,
Dan

 

[dantwomey]

My bridges that I'm using right now.

VBE26-12NO7

Because of the high Vf of 2.73vdc I'm pondering a return to........

KBPC3506T

Which has a Vf of 1.1vdc

Regards,
Dan

P.S. I originally chose to use the VBE's because I had a bunch laying around.