High-voltage 400V power supply, and the tube, the first level is 12AX7, the second level is 12AT7.
According to the actual situation, we are divided into two and developed separately:
PRT06A (280V single tube version, economical type)
PRT06B (400V joint version)
It is consistent with the 400V power supply voltage of the original machine.
The voltage parameters are the same as the original machine.
DC filament power supply, avoiding the influence of voltage fluctuation on the filament
With a delay to turn on the output signal to avoid the strange sound generated by the tube when it is in the heat engine
Listening feelings: The test uses 12AX7+12AT7 (also measured 12AX7), the most special in the low frequency, the depth of the dive, the strength, the bounce is unmatched by many stone preamps, using the imported tube EN foot When testing, the details are richer, the background is quieter and more mellow.
PCB size: 150*200*1.6MM FR4 A grade plate
Power supply requirements: 0-300VAC*40mA, 0-14VAC@1A
package：
1* PRT06B tube pre-stage reference Matisse bile pre-level board 400V（No tube）