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G8HQP Dave · 12th Jan 2019, 9:08 pm

You need to bear in mind the difference between a substitute and an equivalent. A substitute has roughly the same pinout and sufficiently similar characteristics that it will work reasonably well in most circuits; someone trying to sell you a substitute may stretch the truth. An equivalent is almost the same thing as the original; it could be identical, or only have minor differences which will almost always be of little consequence in almost any circuit.

6Q7 and EBC33 may be substitutes, but not equivalents. 12AU7 and ECC82 are equivalents.

12th Jan 2019, 9:08 pm	#26
G8HQP Dave Rest in Peace Join Date: Sep 2008 Location: Solihull, West Midlands, UK. Posts: 4,872	Re: 6Q7G Valve, what brand ? You need to bear in mind the difference between a substitute and an equivalent. A substitute has roughly the same pinout and sufficiently similar characteristics that it will work reasonably well in most circuits; someone trying to sell you a substitute may stretch the truth. An equivalent is almost the same thing as the original; it could be identical, or only have minor differences which will almost always be of little consequence in almost any circuit. 6Q7 and EBC33 may be substitutes, but not equivalents. 12AU7 and ECC82 are equivalents.