I was doing research on how to bias tube amps, and then I discovered that my Epiphone Valve Jr is self biasing. So just put the new tubes in and play. I replaced the Russian Sovtek tubes with some new JJ Tubes. I bought the JJ Tubes set from Amazon as a matched set for my amp. The new tubes are the same types of vacuum tubes as stock: an EL84 as the power tube and a 12AX7 as the pre-amp tube. With the JP1 bypass, the amp makes a substantial amount of hum. I think this is due to the tubes not being warmed up. I tested the amp immediately after turning on, and tubes need a few minutes to warm up before they sound good.
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| Tubes taken out. |
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| Old Sovtek tubes. |
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| New tubes (left) and old tubes (right). |
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