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Old 7th September 2013, 08:01 PM   #1311
tinitus is offline tinitus  Europe
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loose windings, or ?
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Old 7th September 2013, 08:35 PM   #1312
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most probably

whatever it is - it's flawed
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Old 8th September 2013, 02:25 AM   #1313
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hopefully their warranty department isn't flawed....
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Old 8th September 2013, 11:42 AM   #1314
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Here are some photos:
Attached Images
File Type: jpg Overview 2.jpg (163.2 KB, 227 views)
File Type: jpg Front end detail 2.jpg (143.5 KB, 222 views)
File Type: jpg Interior power supply 2.jpg (163.3 KB, 222 views)
File Type: jpg Amp ext 2.jpg (96.3 KB, 221 views)
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Old 8th September 2013, 12:19 PM   #1315
bcmbob is offline bcmbob  United States
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Quiz Time

Your power supplies appear more complex than the Pass units. Can you give some details?

What are the large brown caps and why did you select them?

Are you using one bridge rectifier for both tranis? Just can't see a second.

Can't quite see where the speaker grounds are connected.

Yea, I'm nosy , but that's a nice clean set to gather some good ideas.
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Old 8th September 2013, 12:31 PM   #1316
6L6 is offline 6L6  United States
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Quote:
Originally Posted by bcmbob View Post
What are the large brown caps and why did you select them?
Are you using one bridge rectifier for both tranis? Just can't see a second.
Can't quite see where the speaker grounds are connected.
A quiz! Fun!

Elna Silmic

The bridges are discrete, on the PSU PCB, under clip-on heatsinks. The bridge on the back panel is a ground-breaker.

Back at the PSU


Backbones - a fantastic build! Thanks for sharing!

Last edited by 6L6; 8th September 2013 at 12:34 PM.
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Old 8th September 2013, 12:39 PM   #1317
bcmbob is offline bcmbob  United States
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You can go to the head of the class . Spelling bee is next ----
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Old 8th September 2013, 12:42 PM   #1318
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I'm a bit nosy myself when it comes to other people's designs.
Power supplies are same as Nelson's design. I use boards from Avondale Audio over here in the UK. There is one each side. I have soldered a bank of 4 Schottky diodes (fitted with heatsinks) at one end which then feed into Nelson's CRC arrangement with a final 10uF 250V output cap made by Clarity. This gives the split rail supply so only one set of rectifying diodes per channel. The rest of the caps are 10,000uF Mundorfs. If you want the boards from Avondale unpopulated as I did you will have to phone them and in fact they may not do this size anymore but it is worth asking. They are mounted on the back of the front plate.
The large brown caps I think you are referring to are the 1000uF Elna Silmic II on the front ends. They don't quite fit the boards but they sound very good. They have an element of relaxed analogue about them without any loss of detail. Not sharp or brittle.
Speaker grounds are taken from the central pin on the power supply output boards (they are the white ones) and they pass to the upper speaker post. The other white ground is attached to the same output pin of the power supply and passes to the front end ground.
The central ground of the power supply is also connected to the earth ground via a CL60.
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Old 8th September 2013, 12:47 PM   #1319
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Quote:
Originally Posted by 6L6 View Post
A quiz! Fun!

Elna Silmic CORRECT

The bridges are discrete, on the PSU PCB, under clip-on heatsinks. CORRECT

The bridge on the back panel is a ground-breaker. NO BRIDGE SORRY THAT IS WRONG

Back at the PSU


Backbones - a fantastic build! Thanks for sharing!
Itsa Pleasure
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Old 8th September 2013, 12:49 PM   #1320
bcmbob is offline bcmbob  United States
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Very nice. I've auditioned various caps on several MyRef builds but haven't seen a lot of discussion in that area on the Pass threads. Something to look forward to down the road.

TNK.
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