Yellow Jackets Power Reduction / Yellow Jacket Fixed Bias Triode Volume Reduction 7585 JJ EL84 Kit Pair

Yellow Jacket Fixed Bias Triode Volume Reduction 7585 JJ EL84 Kit Pair Click on image(s) above to view larger
£100.00

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Originally designed by Andy Marshall of THD fame yellow jackets current limiting voltage conditioning adaptors for use in most 20 to 100 watt amps that use 6L6, EL34, 6550 or 6V6 output tubes. They Allow you to reduce the output of your amp and change the characteristics by using EL84.
Volume Reduction between 75% & 85%

Our Fixed Bias Triode kit is designed to reduce the volume of your amp by between 75% & 85% . This Kit consists of 2 Yellow Jackets Fixed Bias Triode operation Valve converters and Two Matched JJ EL84 Output valves. Yellow Jacket has an Overall height with the EL84 fitted of approx. 5 inches. So please check your clearance before ordering

The Yellow Jacket Fixed Bias Triode operation is for amps with fixed bias circuit.
These are also known as adjustable bias as the output valves have their cathode connected directly to ground and a negative DC voltage applied to their control grid. So you will need to check your amps circuit operation before purchase.

These Triode operational converters not only drop the volume of your amp but also changes the operational mode to class A . This provides a VOX style tone with an increased touch sensitive response. The Yellow Jacket Fixed Bias Pentode operation is for amps with fixed bias circuit. So these can be used on other Fixed bias amps in your collection.

These specialized power reduction , current-limiting voltage conditioning adapters converts your amplifier from Class AB to Class A operation and drops output power by using EL84 without modification or rebiasing. These converters for Fixed Bias amps cleverly provide the necessary plate voltage drop and current limiting on the screens as well as blocking the amplifiers grid bias voltage while configuring the EL84 in a Class A.

Power Reduction Pentode or Triode ?

We Offer two Kits 5070 Pentode Operation and 7585 Triode Operation

Pentode Yellow Jacket will reduce your amps output by between 50% to 70%
Triode Yellow Jacket will reduce your amps output by between 75% to 85%

A Marshall 100 watt Super Lead with 4 EL34 would provide 100W RMS power output.
In Pentode Operation with 4 Yellow Jackets approx. 28 to 36 Watts,
In Triode Operation with 4 Yellow Jackets Approx 16 to 20 Watts

A Marshall 50 watt Super Bass with 2 EL34 would provide 50W RMS power output.
In Pentode Operation with 2 Yellow Jackets approx. 14 to 18 Watts
In Triode Operation with 2 Yellow Jackets approx. 8 to 10 Watts

Please note
Yellow Jackets cannot be used in amplifiers with plate voltages in excess of 515VDC and over 100 watts rms. It is not suitable for Peavey 6505, Bugera 6262 Infinium, Bugera 333XL Infinium, Orange OR120 and most valve bass amplifiers such as Ampeg SVT, Hiwatt 201, Marshall VBA etc

Product Measurements by Type
Item Diameter 1.301 in.
Item Height, without pins 2.18 in.
Item Height, with valve 5.0 in.

This Kit consists of

2 Yellow Jackets Fixed Bias Triode operation 7585 Valve converters
2 Selected JJ EL84 Output valves

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