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Home FAQ Amp & PA Questions Do My Preamp Tubes Have to be Biased?
Do My Preamp Tubes Have to be Biased? PDF Print E-mail
Written by Bari   
Tuesday, 17 November 2009 22:45

There is no biasing required on preamp tubes as they are self biasing. This means that you don't need a tech to experiment with different preamp tubes and you can mix different tubes without fear. We help many of our customers handpick a set of tubes for their amp - generally we don't end up with the same tube in every position. A recent example was a Marshall JCM 800 combo that we worked on for a customer. This amp worked really well with 4-Ruby 12AX7AC5 HG's and 1- GT ECC83 gold in the 2nd preamp position. The amp really lit up with that 2nd postion ECC83 but when we tried ECC83's in every position the customer didn't like the tone or the dynamics as much with his Les Paul's pickups.

Bottom line - Preamp tubes can definitely change the tone as well as the dynamics of an amp so next time you've got a few extra minutes do some exploring with different tubes. Most people are amazed at how much different their amp sounds and feels with different preamps.



Last Updated on Friday, 11 November 2011 23:03