Mr211's Blog

D/A High voltage use R-L-C-L-C net to generate 230V for Tube 6922 plate-voltage. Rectifier is 6Z4 and put in delay-on function. D/A out...

Prepare close shielding-net I buy a big heat sink from internet. Heat sink drill holes for mount 120w resistors. Measure pitch distance...

Order 120W VR for step down high voltage. Put resistors on wood rack and finish high voltage connection. After long time debug a tin...

After  check high voltage generate have a problem cause by step-down resistor. Because PL519 will take 580V/200mA so resistor of step-do...

This week finish audio amp. (6C45pi) and IF modulation (ECL82) circuit. For good shielding reason I design to build a small space for I...

Fix shielding net on front side and assemble power bottom panel. Mid panel for fix volume knob. Fix shielding net on rear side and asse...

Fix front plate and rear late. Placement IF components. Placement high voltage components. Prepare net of copper. For radial issue...