I meant, can I substitute a 6SN7 with an ECC34?
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Despite some vendor claims the DIY community has long considered the ECC34 as not being a sub for a 6SN7. My only personal experience with British CV1988s is very good in fact they are possibly the best in my gear. Don't confuse these with the BRIMAR made for export 6SN7GT which is a mediocre tube IMHO.