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Phil Allison[_4_] Phil Allison[_4_] is offline
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Default Best new EL84 tubes?

LV wrote:

Phil, your advice rocks !


** Does it?

What about the JJs?



** I service a lot of guitar amps, many of them using EL84 output tubes.

JJ is a good brand, but so are Sovtek and Electro Harmonix - high failure rate with EL84s is due to BAD amplifier design, not the valves.

Most recent models from PV, Fender and VOX run their EL84s waaayyyy too hot and burn them out in short order.

One needs to modify the bias circuitry and the are a couple of ways to do this - depending if the amp uses grid or cathode bias.

Plate dissipation per valve needs to be brought back to 8 or 9 watts, not 14 or 15.


..... Phil