Pictures of your diy Pass amplifier

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Mixon1

Member
Joined 2007
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.
 
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Plott

Plott

Member
Joined 2021
Paid Member
Mixon1 said:
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 1152668 View attachment 1152669 View attachment 1152670 View attachment 1152671 View attachment 1152672
Click to expand...
Wow, I'm deeply impressed!
 
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Zen Mod

Zen Mod

Official Court Jester
Joined 2003
zenmod.in.rs/
Paid Member
Mixon1 said:
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.
Click to expand...

Fugly!

:clown:
 
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P

pstefan98

Member
Joined 2023
Pass ACAs v1.8 run in balanced mono configuration with my Focal Chora 826 towers.
 

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samoloko

Member
Joined 2006
tanwa said:
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.:)
Click to expand...
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
 
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elwood625

elwood625

Member
Joined 2013
Paid Member
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.
 

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SRMcGee

SRMcGee

Member
Joined 2004
Paid Member
markw51 said:
Each channel has its own rectifier and filter bank - two filter banks on the same board. View attachment 1158392 Only the ground is common.
Click to expand...
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
 
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Ben Mah

Member
Joined 2012
Paid Member
SRMcGee said:
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
Click to expand...

Probably a typo, perhaps 0.47R x 4.

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

markw51

Member
Joined 2006
SRMcGee said:
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
Click to expand...
They are 0.47 ohm resistors in parallel. The writing on the side of these military grade components can be confusing.
 
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