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Old 18th April 2009, 08:35 AM   #711
cviller is offline cviller  Denmark
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Quote:
Originally posted by smyslow
Hi Christian,

just sent you an order about some F5 and PSU boards.

Thanks for your effort.

smyslow

And I got the payment and confirm mail - this gb site seems to be working smoothly.
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Old 18th April 2009, 11:55 AM   #712
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Quote:
I will check again but I don't think so (+/- 24 V).
Did you try to disconnect one channel at a time from psu?
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Old 18th April 2009, 12:00 PM   #713
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Default Back at Pass

Hi Christian,
From your Jan. GB: I've been distracted lately with putting together/equipping a varily decent build/test bench: Just current with thread. Curious; the new PCB-3/13/09, Is only change to Q5 silk?

Also, new Rect.B PCB---2 diode bridges, etc. vs PCB. Is improvement because of 'better' ultra fast recovery of To-247 devices like MUR3020W? Or is mainly just to simplify/organize PS input? On brd heatsink option a +plus if needed; yes but I'm using big Conrads with plenty of surplus 'sink' for To-247 RBs . If no real advantage, RectB PCB seems more costly? Just curious, cause cuz last GB you only had 1/2 of PSU brds I needed so I got a couple of Peter's PSBs with snap off RB chips. Just considering my PS options.
Thanks

Charles
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I'm kinda curious about that myself........
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Old 18th April 2009, 01:48 PM   #714
cviller is offline cviller  Denmark
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Default Re: Back at Pass

Quote:
Originally posted by cowboy99
Hi Christian,
1. From your Jan. GB: I've been distracted lately with putting together/equipping a varily decent build/test bench: Just current with thread. Curious; the new PCB-3/13/09, Is only change to Q5 silk?

2. Also, new Rect.B PCB---2 diode bridges, etc. vs PCB. Is improvement because of 'better' ultra fast recovery of To-247 devices like MUR3020W? Or is mainly just to simplify/organize PS input? On brd heatsink option a +plus if needed; yes but I'm using big Conrads with plenty of surplus 'sink' for To-247 RBs . If no real advantage, RectB PCB seems more costly? Just curious, cause cuz last GB you only had 1/2 of PSU brds I needed so I got a couple of Peter's PSBs with snap off RB chips. Just considering my PS options.
1. And I have added a pin header footprint for the LED - but you're right - nothing serious.

2. Well lots of people have asked for these, and they make it easy to use ultra fast recovery diodes and supply more current for bigger amps. In fact I consider them of general purpose nature - and not directly related to the F5, although it seems like an upgrade well worth it.
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Old 18th April 2009, 01:56 PM   #715
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I think the rectifier boards look wicked slick. Or will with black pcb and heatsinks!
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Old 18th April 2009, 05:48 PM   #716
1MOR is offline 1MOR  United States
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Order just sent for set of F5 PS boards.
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Old 18th April 2009, 06:13 PM   #717
labjr is online now labjr  United States
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Do high speed rectifiers make this amp sound better? Doesn't Nelson use ordinary bridge rectifiers?
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Old 19th April 2009, 11:45 AM   #718
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Some informations from Nelson PASS about Power Supplies :
http://passlabs.com/articles.htm
Download the PDF and read the section about Recifiers.

"Yeah, sure, rectifiers are important, after all, the AC has to get converted to DC, but I don't like the fast recovery types that some audiophiles have raved about. Fast recovery means that they withstand many amps and volts in a tenth of a few nano-seconds, something we don't see very often on the old 60 Hz AC line. They are essential element in switching power supplies, but for regular "linear" power supplies, I much prefer SLOW diodes, and we create them by placing small capacitor circuits across the diodes, which greatly reduces radiated noise."

Just wondering about the caps type and values...
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Old 19th April 2009, 12:16 PM   #719
cviller is offline cviller  Denmark
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Quote:
Originally posted by korben69
Some informations from Nelson PASS about Power Supplies :
http://passlabs.com/articles.htm
Download the PDF and read the section about Recifiers.

"Yeah, sure, rectifiers are important, after all, the AC has to get converted to DC, but I don't like the fast recovery types that some audiophiles have raved about. Fast recovery means that they withstand many amps and volts in a tenth of a few nano-seconds, something we don't see very often on the old 60 Hz AC line. They are essential element in switching power supplies, but for regular "linear" power supplies, I much prefer SLOW diodes, and we create them by placing small capacitor circuits across the diodes, which greatly reduces radiated noise."

Just wondering about the caps type and values...

Papa has changed his mind since that article, I have read it several times in the pass labs forum, but my search only gave this reference:
http://www.diyaudio.com/forums/showt...830#post321830


This may also be an inspiration:
http://www.diyaudio.com/forums/showt...ght=#post17199
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Old 19th April 2009, 01:01 PM   #720
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But aren't Fast recovery different fron Ultra fast recovery?
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