If you do want to do this then run one of our “EuroDamaper rings” on them. We also do not recommend these in small combo amps where the tubes are in close proximity to the speaker. All preamp tubes are microphonic it's just a matter of where the threshold is and longer plate tubes will squeal before a short plate tube will, so for real high gain amps we would stay with the ECC83S or better yet the graded high gain ECC83S's that we hand pick for high gain amps. We do not recommend them for use in the gain stages of high gain amps if you like to run your gain maxed out. This is a great tube for V1 positions or for use in all positions in vintage amps. The ECC803S's are about 10% lower in gain. These are however not as high in gain as the JJ ECC83S. The ECC803S is also a little hotter in the high end than the ECC83S. It has the same deep, tight low end that the ECC83S has but the mids in the ECC803S are even thicker and more harmonically complex than the ECC83S. It's the longest plate 12AX7 type tube ever made. Factory Data Sheet: ECC803S Our observations: A very long plate 12AX7 offering from JJ and once again it's a beautiful sounding tube. I have a Blues Deluxe Reissue.After a lot of research on preamp tubes, I use the following combination.(V1)-5751 - (V2)-5751 - (V3)-12AX7I'm sure that this combinations would work well in a Hot Rod Deluxe.Check out the following article:V3 is your 'Phase Inverter'.In V1, going from a 12AX7 to a 5751, reduces front end gain (from 100 to 60-70), and provides more clean headroom.I advise not going down to a 12AY7 (gain of 40). JJ Electronic ECC803 S - 12AX7 Factory description: Classic long plate European design with special grid plated by gold to reduce microphone interaction and noise.
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