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129.96.251.124
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Follow Ups:
And that is about it.
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Al G
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In my amps, TAD-1000s, they are but may not be in all amps. Check with the manufacturer. If they are than the bias on the 6CA7 (EL34) is a little more than half the bias of the KT88/6550, again in my amps.
EL34 and 6CA7 are meant to be equivalents. 6550 and KT88 are very close to being equivalents. However, there are a number of important differences between EL34/6CA7 and 6550/KT88. Whether they are interchangeable in a particular amp depends on the design; in some cases the substitution would be OK but there are designs where it wouldn't work at all well. As risabet says, if in doubt ask the manufacturer.
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