Pictures of your diy Pass amplifier

[Mixon1]

Thanks all for positive reply🙂
Siberia: All metall milling are done by me = manuell handling, no CNC milling.
I have have made all drawing in CAD before milling. (Solid Works).
myleftear: RG174, actually, maybe to the UV-pcb, but from the XLR/RCA connectors I use SUPRA EFF-I to main pcb.

 

[amplidude]

I use rg179 in signal, silverplated old military Stock, fantastisk cable. And cheap compared to nonsense boutique cable, and probably equally good.
Wish I come this far with my aleph. Enjoy it

 

[Plott]

Hi,
Almost finish with my Aleph 1.2
I started the projekt 13 years ago! Now I only have to power them up for the very first time, but i'm not in a hurry.
They messured L680xW480xH400mm and the weight about 65kg.
I have Pass design i mind when I made the front, its made of 20+25mm aluminium plates, just for design.
kk-pcb.net and sjostromaudio.com have delivered the pcb's, other ones are DIY like VU-meter pcb, DC protection, T-toggle for switch.
The cooling fins from heatsinkusa.com, and I choose the 10.080" 16 inch tall x 10pcs. I split two of them so each side are made of 2½pc.
The picture with the set up contains a look a like HPA-1, but is also made by me with Whammy inlet. Comming up soon🙂
The speakers are mostly Dynaudio element and the front speaker are the Dynaudio model "Finale" but with upgraded element.
Missing in the set up are my Aleph 1.7 who are almost finnished on the building table. (Sorry for misspelled).
I hope you will enjoy the pics below.
Best regards, Mikael from Sweden.

View attachment 1152668View attachment 1152669View attachment 1152670View attachment 1152671View attachment 1152672

Wow, I'm deeply impressed!

 

[Zen Mod]

Hi,
Almost finish with my Aleph 1.2
I started the projekt 13 years ago! Now I only have to power them up for the very first time, but i'm not in a hurry.
They messured L680xW480xH400mm and the weight about 65kg.
I have Pass design i mind when I made the front, its made of 20+25mm aluminium plates, just for design.
kk-pcb.net and sjostromaudio.com have delivered the pcb's, other ones are DIY like VU-meter pcb, DC protection, T-toggle for switch.
The cooling fins from heatsinkusa.com, and I choose the 10.080" 16 inch tall x 10pcs. I split two of them so each side are made of 2½pc.
The picture with the set up contains a look a like HPA-1, but is also made by me with Whammy inlet. Comming up soon🙂
The speakers are mostly Dynaudio element and the front speaker are the Dynaudio model "Finale" but with upgraded element.
Missing in the set up are my Aleph 1.7 who are almost finnished on the building table. (Sorry for misspelled).
I hope you will enjoy the pics below.
Best regards, Mikael from Sweden.

Fugly!

 

[SRMcGee]

Mikael:

Amazing work! You've built something incredible -- what an inspirational build! I owned a pair of Nelson's Aleph 1.2 mono blocks for about 13 years and absolutely loved them, and I hope you get even more pleasure out of yours.

Regards,
Scott

 

[pstefan98]

Pass ACAs v1.8 run in balanced mono configuration with my Focal Chora 826 towers.

 

[markw51]

 

[G600]

Beautiful build, but why two toroids with only one PSU PCB?
Are they single secondaries?

 

[markw51]

Each channel has its own rectifier and filter bank - two filter banks on the same board.

Only the ground is common.

 

[samoloko]

Most of the part were designed with 3D computer modeling, that I can simulate the assembly of all part and then put on cnc cut. More pictures of that part.

Happy to see you guy enjoying.🙂

that copper plates look very nice - how much are their thickness

would you please recommend a properly grade of copper to use as a copper plate connecting power supply filtering caps In amp

 

[elwood625]

Pictures of my J2 clone by EUVL, SJEP120R100's compliments of Nelson Pass during codyt's first give away. Notice the snubber PCB's on each diode bridge. One channel has 1.2 - 0.2mV and the other 2.6 - 3.2mV of DC offset. I changed RV1 from 100 ohm 1 turn to a 25 turn pot. made a very big difference setting DC offset.

 

[SRMcGee]

Each channel has its own rectifier and filter bank - two filter banks on the same board. View attachment 1158392Only the ground is common.

markw51:

I am certainly no expert, but I am surprised by the value of the resistors in your power supply. The "R" in my CRC power supplies is typically 0.07R to 0.15R, so your value of 1175R seems very high to me. Can you explain the rationale?

Regards,
Scott

 

[SRMcGee]

elwood625:

That's a very handsome amplifier -- kudos! How does it sound?

Regards,
Scott

 

[Ben Mah]

markw51:

I am certainly no expert, but I am surprised by the value of the resistors in your power supply. The "R" in my CRC power supplies is typically 0.07R to 0.15R, so your value of 1175R seems very high to me. Can you explain the rationale?

Regards,
Scott

Probably a typo, perhaps 0.47R x 4.

If 2A of current, 1175R would be dissipating 4.7kW!

 

[pinholer]

At 10mA of current, the voltage drop would be about 12V so the resistors should be ok. Very little power to output devices, though.

 

[elwood625]

That's a very handsome amplifier -- kudos! How does it sound?

I just pulled my Sony VFET P channel amp out of rotation and the J2 clone replaced it. I'll let you know after the weekend when I've had time to compare. I'm using the same preamp, just with the balanced outputs going to the J2.

 

[markw51]

markw51:

I am certainly no expert, but I am surprised by the value of the resistors in your power supply. The "R" in my CRC power supplies is typically 0.07R to 0.15R, so your value of 1175R seems very high to me. Can you explain the rationale?

Regards,
Scott

They are 0.47 ohm resistors in parallel. The writing on the side of these military grade components can be confusing.

 

[SRMcGee]

markw51:

Their value makes perfect sense. I didn't see the writing on your mil-spec resistors; I was responding to the power supply design you posted.

Regards.

 

[tanwa]

that copper plates look very nice - how much are their thickness

would you please recommend a properly grade of copper to use as a copper plate connecting power supply filtering caps In amp

They are 1 mm thk. just a non alloy copper

 

[cleaton]

ACA mono blocks