«  All depends on the guitar »

Compressor and Booster Tube 12AX7 from the early '90s.
Made in Japan
The lamp is equipped with a shield.

2 switches:
- Effect
- Boost

4 knobs:
- Sensitivity (entry level)
- Master (output)
- Attack
- Sustain

UTILIZATION

Usage is not complicated:

1. You plug the guitar
2. It adjusts the input level to prevent the lamp saturates
3. You can find the desired effect (attack and sustain)
4. It adjusts the output level

SOUND QUALITY

Quality can be very good, provided you use a guitar with an output level low enough.
The sustainer produced many blows to the bottom, more than a compressor model without lamp.
With humbuckers pedal saturates funny. Looks like the lamp chimes and resonates a little.
It is then necessary to sharply reduce the input level. But to compensate, increase all the Masters, which increases the breath, especially with a high sustain. In practice, this configuration is not usable.
It's a shame because this compressor heats pretty sound.
I got a fantastic result on a Yamaha nylon electro-AEX500N.
Microphones on it pretty simple: you can set the input level was nearly fully, and thus minimize the background noise.

This pedal

OVERALL OPINION

inflexible.
It is to be reserved for guitars with microphones rather simple vintage or electro. It's really not made for humbuckers.
I would prefer a Boss CS-2 or an Ibanez CP-835.