2009 we asked our good friends at JJ Electronic to build us a low power EL84
and they agreed to do it! It's not an easy task to build a tube that has never
been built, but JJ has proven they are the people to do it. The new JJ EL844 is
an entirely new tube that dissipates 9 watts and is a drop in replacement for
EL84's in most all amps. It has a very smooth sweet breakup just like the JJ
EL84 and it will breakup a couple decibels earlier. These will drop into most cathode and fixed
biased amps like the Orange AD amps, VOX AC amps, Laney VC amps, Crate V and VC
amps including the Palomino, Budda amps, Fender Blues and Pro junior amps. It
is also an option for all the 5 watters like the Valve Junior, Blackheart, Mini
Cat and others.
With adjustable bias amps like the Marshall 201 and 401 or Bugera V22, Jet City or Carvin, these must be biased 25% lower than standard EL84's to compensate for the wattage drop (12 vs 9 watt maximum dissipation). For those of you who are familiar with the old EL83, the EL844 plate structure is quite similar but the EL844 is NOT a replacement for an EL83!!! It is quite different.
After a 24 hour burn in all power tubes are tested for noise and matched at multiple operating points for plate current (± one milliamp) and transconductance.