Re: Tube swap in a Marshall Valvestate failed...
I have a Mk II Valvestate VS65R which had a sort of ringing after-note artifact to the sound when palm muted, and a bit of hum too. I changed out the stock ECC83 for a JJ ECC83S. This did improve both issues to a large extent.
There may be some sort of compatibility issue with the 5751, but I cant see how.
On a side note, the tube I pulled from the VS65R (1997) had no markings on it whatsoever, no valve type or manufacturer. Is your 12AX7 from the Mk III Valvestate the same?
I have a Mk II Valvestate VS65R which had a sort of ringing after-note artifact to the sound when palm muted, and a bit of hum too. I changed out the stock ECC83 for a JJ ECC83S. This did improve both issues to a large extent.
There may be some sort of compatibility issue with the 5751, but I cant see how.
On a side note, the tube I pulled from the VS65R (1997) had no markings on it whatsoever, no valve type or manufacturer. Is your 12AX7 from the Mk III Valvestate the same?
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