The updated schematic also runs cooler: the power supply choke and shunt regulator dissipate heat more evenly, reducing internal chassis temperature by ~9°C after one hour of operation.
With f_c lowered from 10Hz to 3Hz, the new value becomes . This minimizes phase shift at low frequencies, tightening bass response without increasing blocking distortion. xin zhi zhao schematic updated
The original 6SN7 grid often connected directly to the input RCA jack. The updated version inserts: The updated schematic also runs cooler: the power
No major safety issues have been reported, though a small number of builders initially blew the shunt regulator by omitting the heatsink (see mistake 5.4 above). The original 6SN7 grid often connected directly to
The TL783 or LR8 can only dissipate ~3W without a heatsink. For B+ above 350V, use a dropping resistor (5kΩ–10kΩ) before the regulator to offload power.