Welcome! Need support, you got it. Or share you ideas and experiences.
Can I substitute the existing 6AC7 metal tube on my Laurel IIX with the various 6sj7, 6sg7 or even the red 5693?If yes, what sonic difference would I be expecting?
And I notice there are the GT (glass tube) version of the above tubes and the metal case version. ARe they all compatible?
Like to hear..
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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I believe the Nostalgia Air site shows these as direct subs. Just wondering. The 6SD7GT's are cool looking tubes.
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That site does not contain the tube parameters. I have a tube substitution handbook that shows the 6CA7 as a sub for the 6AC7. It just shows that some published substitutions are wrong.Same pin out is a bit different then the same electrical characteristics. Now, if it proves out that the tube is an electrical sub, I am all for cooler looking tubes than the rather homely 6AC7.
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