Our JJ ECC803S long plate version of the ECC83S is an ECC83/12AX7 compatible valve and it is basically a long plated version with built in extra cooling. So it is designed for long service life. Feedback is that the longer plate enhances the bass and mid range as compared to the “standard” ECC83S. Longer plate valves are more likely to be microphonic than short plate valves so if you plan to use this valve in a combo amp , then you should use a damper ring on the valve. This issue is not a problem in amp heads.
Each JJ ECC803S is tested by us on our Avo testers in addition to factory testing
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We also give a 180 day from receipt warranty on the product ( excludes user caused mechanical damage ) for peace of mind .