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Old 24th January 2013, 04:14 AM   #1541
TC Goh is offline TC Goh  Hong Kong
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Default A75?

Norb

Sounds like a possibility. Can you please point me to the A75 thread? Also, is this avaliable in kit form?

I have also been reading up on passive pre's. Any thoughts on how these would perform?

TC

Best wishes

TC

Quote:
Originally Posted by norb View Post
Dear TC,

maybe the A75 would be an option for you, as you can alter the sonic characteristic of this amp in a large range.

I tried different values for some components as suggested in the A75 article (feed-back amount and folded cascode operation) and the amp could be made very mellow and softly sounding (Speakers are Isophon Europa).

Since i´m more the rocking kind, i set up the amp in the opposite soundwise, but the difference in sound characteristic was amazing, espacially voices and classical music could be made like honey: sweet, soft and golden.

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Old 27th January 2013, 11:30 AM   #1542
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Default Pass A40 Monoblocks

Hello to all, this is my first post on this great audio forum. Thought I would share a few photos of my Pass A40 project. First of all I would like to say thanks very much for the many hints and tips I've picked up from all who have built this amplifier. I have spent many hours reading loads of posts and have finally registered as a member of the forum.

My amps are still "work in progress" but are getting ever closer to completion after a busy two week christmas break spent mostly in my dads workshop. PCBs are built and metal work 99% finished; just cosmetics and case top and bottom to sort out before internal wiring up can commence.

Heatsinks are 0.5 deg c / watt per output transistor; mains transformer is 500va; smoothing caps are both 22000uF.

Hoping to build a B1 buffer next but I was wondering if anyone knows,
A) What is the input sensitivity of the A40 for full output,
B) Can the amps run with approx +/- 40V rails (my transformer secondaries are 25V and I have replaced the JFET with 2N4392,
C) Could the output stage bias be increased to 2 amps. My speakers are 4 ohms and the A40 will move into class AB at 20 watts into this load.
Maybe these are really questions for Nelson Pass.

Many thanks to everyone. I will post again when the project is complete and include a gerber file for my PCB which I layed out using the excellent "Free PCB" program .
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File Type: jpg DSC_0184.jpg (327.0 KB, 909 views)
File Type: jpg DSC_0188.jpg (498.6 KB, 888 views)
File Type: jpg DSC_0191.jpg (588.6 KB, 851 views)
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Old 27th January 2013, 11:48 AM   #1543
Marra is offline Marra  United Kingdom
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Nice work.
From where did you obtain the small transistor heatsinks?
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Old 27th January 2013, 02:06 PM   #1544
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Hi Marra,

The small heatsinks came from RS components. Part number is 712 4320.
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Old 27th January 2013, 03:04 PM   #1545
Marra is offline Marra  United Kingdom
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Thank you.I need some caps So I'll get some of those as well.
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Old 30th January 2013, 02:03 PM   #1546
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Hi,
a little bit teasing!
Test building!
Click the image to open in full size.
And, we will see if it fit ...
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Old 30th January 2013, 02:13 PM   #1547
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check your pics, they are not showing
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Old 30th January 2013, 02:17 PM   #1548
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Sorry,
but i see the pics (here as a screenshot9.
Click the image to open in full size.
Any problems, please report. I will search another provider.

Last edited by carsten.witt; 30th January 2013 at 02:20 PM.
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Old 30th January 2013, 02:22 PM   #1549
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Very nice work.

(and just in time, I forgot my password for the A-F.de again)
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Old 30th January 2013, 02:32 PM   #1550
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Earthloop, that amp is cute as hell! Awesome!
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