Service your poweramps fast and easy: a simple bias-probe for use with any voltage-meter ! Just plug in the bias-probe between the powertube and the tube-socket, messure the idle current and setup the bias - that's all.

To operate this prove a voltage meter is needed, which is not included in the kit.

This probe is for all EL34, 6L6, KT88, 6550 and similar tubes

Degree of difficulty: simple

LPS = Long Plate Spiral Heater

Sounds pretty good in the input section of "modern" Fender amps with more overdrive but is also very popular among the Marshall users.

TT-Selection: V1
The Ultimate 12AX7. Big, warm, and musical. High Gain, ultra-low microphonics, and superb linearity with a dynamic 3-D sound.

Sounds similar to the "normal" JJ 12AX7, but the overall sound is more fuller and powerfull with a bigger bass. In comparison to its litte brother JJ12AX7 the JJ ECC803 also has much bigger plates and draws much more current if used with standard 12AX7 parameters. The quality of this tube is absolutly OK and it is suited for instrumental amps as well as audio and / or HiFi Tube-Amps
Highly recommende also for use in so called HiGain-Amps where the sounds are often a little bit cold and harsh.

Can be used as Voltage or Impedance selector.

Open jack, 2-pole, 2 contacts, with washer and nut, panel thickness 3.5 mm

All JJ preamptubes are selected within a close tolerance and handtested for best sound and quality. Furthermore all pins are gold plated to achieve best electrical contact.
What about the sound ? It is still the famouse and well known JJ brownsound - warm and smooth.