This price is the welding test qualified products, the price does not include the electronic tube and transformer
PCB size: 154*254*1.6MM FR4 A grade gold immersion plate
Reference weight: 500G
PRT08A in the design of the original SL1 amplifier circuit parameters, did not make any adjustments; we updated the part greater than the power supply:
The high-voltage power supply uses a regulated power supply, with MOS tubes as the voltage regulator tubes.
The filament is regulated in two groups, supplying 12AU7, AX7 and 6.3V 6DJ8 (6922) respectively.
In the PRT08A, we added a 30-second delayed turn-on output component to reduce the noise before turning on the power.
In terms of ingredients, the choice of Panasonic and 718 God resistance, gold-plated ceramic tube holder, BC-Philips capacitors, ELNA capacitors, etc., high-voltage regulator regulator tube selection of Toshiba tubes, coupling capacitors and then for the ERO + MKP series, a high cost-effective.
Players mill, then, only need to grind and change two places on the line:
Priority is the electronic tube, it is recommended to use imported electronic tube
Secondly, the PCB on the six coupling capacitors to replace this higher level brand (such as MCAP Mondorf)
Required tubes:
12AU7 1 only
12AX7 2 only
6922 1pc
Input voltage requirements (three groups):
220V@0.05A
9V@1A
14V@1A
The above current is the minimum current requirement.
Package:
1pc PRT08A preamplifier finished board (Elvis Presley Legend Preamp CAT SL1)
