Tremler is a tremolo/boost pedal. Equipped with two 6021:s. Powered by with an external 1A, 12VDC, 2,5mm center positive adapter. Voltage is internally converted to 165VDC feeding the tubes. When powered up it waits about 30 sec until the high voltage is placed on the anodes. The circuit is based on Fenders Vibro-Champ. Running at 2.5-6Hz in the tremolo.

Soundclip first in bypass then boost

Max depth and speed

Max depth and min speed

Middlepos on the knobs