I started by trying different tubes at the front. Some Brimar 6SN7GTs I bought sounded OK but hummed. The hum diminished after 30 hours or so use, but didn't completely go away. Then I got a GEC 6AS7 for the back, and with the GEC in the back the Brimars are dead silent. I still have a few other tubes for the front to try.
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Sources: Music files: Squeezebox 3 CD: Shanling CD-T80 CD Player Vinyl: Regar Plana 3 turntable>Denon DL110 cartridge>Cambridge Azur 640P phono amp
CD|SACD|DVD: Philips DVD 963SA Off-air: Humax F2 FOX T Freeview box Portable: iRiver H120, iRiver H140, Palm TX, S-E K800i
Amplification: Goldpoint passive preamp>Leak Stereo 60 valve|Unison Research Unico amp>Rockhopper Pimeta|DarkVoice 332|GS-1|Practical Devices XM3|RSA SR-71|iBasso D1|Xin Ref on order
DAC: Beresford TC-7510 Mk III|iBasso D1
Speakers: Audiomaster LS3/5A|KEF Reference 103
Headphones: Senn MX500|Senn PX100|Senn PMX100|Senn CX300|AKG K501|AKG K701|Beyer DT880
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