YJShort EL84 to 6L6 / EL34 Adapter (Short)
Yellow Jacket® converters are a type of specialized adapter which permits the use of EL84/6BQ5 power tubes in place of 6V6, 6L6, EL34, and 7591-type vacuum tubes. These converters allow you to harness the musicality of EL84 vacuum tubes in amps that don't use them already. It can be like hearing a whole new amplifier.
This converts from Class AB to Class A operation and drops power output by 50% to 70% with no rebiasing involved, which makes modifying your amp's tone extremely easy. The triode version provides a greater power reduction and more linearity than the standard (pentode) version. These converters reduce the plate and screen voltages by 100VDC and not only rearrange the pin locations of the tubes, but also provide the necessary plate voltage drop and current limiting on the screens, as well as blocking the amplifier's grid bias voltage while configuring the EL84 in a Class-A, self-adjusting cathode-bias circuit.
In other words, there are no adjustments to make and no modifications necessary, you simply plug the Yellow Jacket® into the amp's output tube sockets, plug the EL84s into the Yellow Jacket® converters, turn on the amp and play.
This short version is shorter than the standard YJS converter, allowing for use in amps that do not have room for standard converters. It is a specialized, current-limiting/voltage-conditioning adapter for use in most 20-100 watt amps which use 6L6, EL34, 6550 or 6V6 output tubes.
Converter-only. Tube not included. Requires an EL84 vacuum tube.
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- Converts most audio amplifiers with 6L6s, EL34s, 6550s, or 6V6s and similar-based tubes to EL84s without modification or rebiasing.
- Converts: Class AB to Class A operation
- Drops Output Power: 50% to 70%. The triode version provides a greater power reduction and more linearity than the standard (pentode) version.
- Safe for all common amplifiers and transformers.