Aleph 5 PSU capacitor

[luspos]

good morning everyone I have these sprague they are very big 65 mm diameter 105 mm height they could be good for the aleph 5 power supply I have 24 pieces thanks

 

[Zen Mod]

if rated voltage greater than intended rail, certainly

 

[Aleph5]

I think the originals were 25,000uF. I replaced those four with two 68,000uF Nichicons I got from Mouser. Not cheap (~$100 in U.S.), but not too expensive for extending the life of the amp another 25 years.

 

[luspos]

I bought them a few years ago new from a warehouse for €30, the transformer is a 28-0-28 so no voltage problems

 

[Zen Mod]

 

[MARCUS SOLOMON]

Could I ask about ripple current @100Hz capacitor in ALEPH 5, which one is suitable (min or max) ?

https://th.mouser.com/ProductDetail/Cornell-Dubilier-CDE/CGS313U050W4C?qs=0r35cIPu56GkYwKjtv4sQQ%3D%3D

https://www.digikey.co.th/th/products/detail/kemet/ALS30A333KF063/3462201?gad_source=1&gad_campaignid=20145475364&gbraid=0AAAAADrbLliXwmYBwwayVFesO_U4w😵O&gclid=EAIaIQobChMI16XavrCOjQMVmqRmAh3SiQI5EAQYCSABEgJW7vD_BwE&gclsrc=aw.ds

https://www.digikey.co.th/th/products/detail/nichicon/LNT1J333MSE/2549057?gad_source=1&gad_campaignid=18003026842&gbraid=0AAAAADrbLljgUw0zVvWNUyiGWNw8B3Pus&gclid=EAIaIQobChMI16XavrCOjQMVmqRmAh3SiQI5EAQYASABEgJI6PD_BwE&gclsrc=aw.ds

https://www.digikey.co.th/th/products/detail/epcos-tdk-electronics/B41456B8339M000/3545890?gad_source=1&gad_campaignid=18003026842&gbraid=0AAAAADrbLljgUw0zVvWNUyiGWNw8B3Pus&gclid=EAIaIQobChMI16XavrCOjQMVmqRmAh3SiQI5EAQYBSABEgLqqPD_BwE&gclsrc=aw.ds

https://www.digikey.co.th/th/products/detail/vishay-beyschlag-draloric-bc-components/MAL210118333E3/5635857?gad_source=1&gad_campaignid=18003026842&gbraid=0AAAAADrbLljgUw0zVvWNUyiGWNw8B3Pus&gclid=EAIaIQobChMI16XavrCOjQMVmqRmAh3SiQI5EAQYBCABEgJ_9_D_BwE&gclsrc=aw.ds

 

[Zen Mod]

pretty much any of these will work

choose by wallet and availability time

 

[MARCUS SOLOMON]

Very surprise me for original Aleph 5 there're no choke filter and ballast resistors but no hum anymore. But why many Diyers need them to reduce 100Hz hum ?

 

[Ben Mah]

According to the manual, it has 0.12F (120,000uF) of capacitance and output noise of 600uV unweighted.

 

[MARCUS SOLOMON]

Thank you. BEN

I have a pairs of ALEPH 1 first revision. I can't hear any hum & noise from the output but its noise floor as show in the owner manual not a good spec (600uV)

My Aleph 1 also no choke and ballast resistor inside.

 

[Ben Mah]

The sensitivity of your speakers determine how loud the noise is to your ears, assuming that your hearing is not impaired.

Here is a SPL calculator: https://mehlau.net/audio/spl/

(Voltage)squared x (speaker impedance) = Watt

So for 600uV @ 8 Ohm, P = (0.0006V)x(0.0006V)x(8R) = 0.000 00288W

Here is some information on human hearing:

https://www.epd.gov.hk/epd/noise_education/web/ENG_EPD_HTML/m1/intro_5.html