Converts your amp to Class A EL84 operation.
The YJ7591D is an adapter that permits the use of an EL84 power tube in 7591 amps. There are no adjustments
to make and no modifications are necessary. You simply plug the Yellow Jacket into the amp's output tube sockets, plug the
provided EL84s into the Yellow Jacket, turn on the amp, and play.
THD's Yellow Jacket converters not only rearrange
the pin locations of the tubes, but also provide the necessary current limiting on the screens and cathode as well as blocking
the amplifier's grid-bias voltage, configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit.
When the
Yellow Jacket Converters are installed in larger amplifiers intended for 6L6s or EL34 output tubes, the high plate and screen
voltages are reduced as well as current limited to protect the EL84 and to drop output power. When a pair of Yellow Jacket
are used in a Marshall 50W or similar amplifier, the overall power drops to about 20W and takes on more of the character of
an old Vox AC30. The distortion is smoother and more even and the output is both substantially reduced and more compressed
due to the Class-A nature of the Yellow Jackets. In a 100W amp like a Twin Reverb or Marshall 100, either 2 or 4 Yellow Jackets
can be used. If only 2 are used and the other 2 sockets are left empty, the output is dropped to about 20 watts. With 4 in
place, the amp puts out about 40W and takes on a whole new warmth and richness.
Will they hurt your amp? No! Yellow
Jacket converters are safe for all amplifiers and transformers. As all Yellow Jacket converters internally regulates voltage
and current they put no extra strain on amplifiers' power and output transformers or internal components. Using the Yellow
Jacket in higher powered amplifiers actually reduces the strain on the transformers and internal components because it reduces
the overall wattage of the system. Furthermore, the heater (or filament) current of the EL84 is lower than that of the 6L6,
EL34 or 7591, so the Yellow Jacket will reduce the strain on the filament windings of the power transformer as well.
THD Triode Yellow Jacket for 7591 Amps Features:
- Use an EL84 in 7591 amps
- Tubes included
Order today and get a whole new sound.