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