KiT 6550 Hum

[Mark]

Tim,

It could be the choke, but is could also be the tx vibrating the same area.

A Naim nut friend of mine has tried at least 6 different manufacturer's caps in his pre-amp power supply courtesy of the pins and push fit plugs I soldered on them. I have heard the difference, but it takes me while to work out what the difference is and whether it's better or worse overall. It can affect bass and imaging and transient response or speed. IIRC Naim used to swear by Aerovox in their older kit ?

However, what's more important than the manufacturer is that you buy them from their low ESR (equivalent series resistance) ranges. There are many websites that can explain why better then I can. Here's one :

https://passive-components.eu/why-lo...acitor-design/

"For medium and high voltage applications, low loss aluminum electrolytic capacitors are required. Low ESR capacitors have less power losses and internal heating problems as compared to high ESR capacitors. Apart from lowering performance, high ESR values reduce the life of an aluminum electrolytic capacitor. In addition, a low ESR value allows a greater ripple current capacity to be achieved."

Nichicon and Panasonic and others make low esr caps. Panasonic FM is flavour of the month for some. I have some low esr Nichicon caps in some headphone amps I have. I will check which range they are this evening.

I am sure others on this forum have their favorites.

Mark