The Winged 'C'(Svetlana, St Petersberg plant) EL34s are the last I had in my modded ST-70. The performed well enough, that when I could no longer afford/find NOS Phillips ECG or GE output tubes(eight matched) for my current monoblocks, I went with a set of their(SED) 6550Cs. No disappointments what-so-ever! I've been a Siemens small signal tube lover for years. I'm using six of their early sixties CCa's in my CD player. Have you tried any early production(pre '69) Siemens ECC83's? If not- You're in for a treat!
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