Vacuum Tube Pre-amplifier

The circuit of this pre-amplifier have 3 stage start from tube number 12AU7 which the signal could be gain more smooth then the signal transfer to tube number 12AX7 special for each channel (Left and Right channel) deliver the mid-gain of the signal for the best results working in middle sound and treble sound for this 12AX7 tubes

The last stage is transfer to tube number 6922 which are the output stage and invert the signal phase to the correct phase This 6922 tubes can be provide the sweet, and clarity of sound by its characteristic of this tubes (tube # 6922 is well know for one of the best tube for building a pre-amplifier)

This tube pre-amplifier is combine the best characteristic of these popular vacuum tubes together (12AU7, 12AX7, 6922) for the best results and we’re not disappoint

The PCB board is also design by computer by Protel professional circuit design software which delivered the best signal with special size of copper line and Plate-true-hole style board (2 sides’ circuit board) for decrease the hum or noise from PCB board grounding by itself and off course it’s could be reduce the side about half of the board

Wiring the signal connected by pure silver wires with Teflon insulator (military grade) as the best we can find which cost about 5-1 times more expensive than copper wires, I’d say it’s much different results between material of copper and pure silver for the signal wiring.

Power Supply is also tube, the regulator we use 3 tubes which are: 6 X4 RCA, 12B4A and 12AT7 for the best steady in electric for pure tube pre-amplifier with tube power supply

A little bit more about this pre amplifier

Biggest heat sink for spread out the heat
Resistors: “Dale” brand for modified model
Imported parts from around the world, most from USA and Europe this imported parts is use only some that not available

Our Sound Test
First of all, surprising about the singer voice which is wider in sound stage, also the gain of clarity of sound in details from: guitar, drum, treble, human voice
I can’t tell you over the truth, but let’s say this pre-amp selling at our price can beat the big brands that sell over $1200-$1500 easily

Note: Special modified version with resistors “Dale” available for someone who want the best