In Reply to: use 6sj7 or 6sg7 on Laurel IIX? posted by ck on June 24, 2004 at 01:19:58:
This circuit was designed for the 6AC7 and using a very different tube like the 6SJ7/5693 will degrade the performace considerably. This tube as relatively little impact on the sound of the amp if it is functioning properly, it is just serving as a type of current source. A transistor can sound just as good in this circuit.
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