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Leben CS600 Owners - Help

I have recently become a happy owner of CS600. I will write another post about my overall impression of its sound, but there is one minor issue. There is a very subtle hum coming out of the transformer. It does not interfere with music listening, but I can still hear it from the listening position when the music stops and the room is quiet without AC or other ambient noise. Using the Decibel app on iPhone, I tried to measure the sound level. It is not detectable from the listening position. When I place the iPhone just an inch above the top grill of the amp, the sound level goes up from 55 dB (ambient level) to about 68-9 dB. Should I call it 15 dB increase or just a noise at 69dB?

I am just wondering if this is an expected level of transformer hum for a normal CS600. Can any owner of CS600 try it for yourself and confirm? Much appreciated.
hgim

Showing 2 responses by xmuavah

xmuavah
2 posts
 
Hgim,
Thanks for the suggestion on the hum noise. What tubes are you using in your CS600 and why? Have you try any other speakers before buying the M30.1? Thank you in advance.
xmuavah
2 posts
 
Hgim,

I got my CS600 a month ago and have the same hum sound as you described. Thought it was defective and took it to the dealer. His demo unit also have the same hum sound. He told me that it was normal. On mine, I can only hear it when standing or sitting next to it when music is not playing.
As for speakers, I'm also thinking of getting the M30.1. Right now, my CS600 is hooked up to a pair SF Auditors. The combination sound very nice but I always hear or read about the Leben + Harbeth combination. In a few weeks, I'm going to demo the M30.1 to see if they are any better than the SF Auditors.
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