Electro-Harmonix Vacuum Tube, 12AX7 Matched Trio, Instrument-Amplifier Tubes, Polished Finish

I got these to replace the stock valves in my Marshall DSL20hr amp. The stock ones in the V1 and V2 slots had red Marshall logos and are suppose to be JJ's. The one in the V3 slot had a white Marshall logo and is just a generic Chinese one.The stock valves were very muddy and underwhelming. The Electro-harmonix made the amp sound clearer brighter and crunchier. It made it sound more Marshally than it already did. Great upgrade.I also replaced the power tubes with Gold Lion KT77's. It gave it a fuller sound.

These really brought my Fender Blues Deluxe Reissue to life! They provide a real smooth sound to your power tubes and are balanced perfectly for most styles of music. I paired mine with Tung Sol 6L6 STRs and a MIM telecaster with custom shop twisted tele pickups. The sound is exactly what I was looking for.

Worked as they should.. Gotta give credit to Viva Tubes for packing them exceptionally well.

I did not realize how ragged my amp was sounding until I replaced the tubes.

The small company that provided these didn't disappoint. good EH tubes, good value, quick delivery. Couldn't ask for more.

Satisfied customer. Just what I needed to bring my amp back to life.

Have used for years got some new ones