ECC40 Philips rebranded Siemens boxesECC40 Philips rebranded SiemensECC40 Philips rebranded Siemens boxesECC40 Philips rebranded Siemens boxes
ECC40 Siemens, double triode, rimlock socket. One of my favourite audio double preamplifier triodes! The socket is a bit problematic for mounting and very rare, but tubes are really low distortion and great sounding, round plates!!! Philips LC code for ECC40 and factory code
 

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