New Balancer PCB and Kit

Now Includes House-Ground Circuit

Item# PS-3 Kit
Heatsink Height:  HV Capacitors:  HexFRED Rectifier Upgrade: 
Availability: Usually ships in 2-3 business days

Product Description

New Rev C of PS-3 includes a house-ground circuit, just like the PS-1.

The PS-3's PCB is only 4.4" by 4.5" and, like all GlassWare PCBs, is extra thick (0.094 in), US-made, with heavy 2 oz-copper. The PCB holds both a simple RC pi-filtered high-voltage power supply and a low-voltage power supply and low-voltage regulator. The low-voltage regulator is meant to power the tube heaters; the high-voltage power supply, the rest of the tube circuit.

The high-voltage portion of the PS-3 power supply uses four solid-state ultra-fast-recovery rectifiers, a simple RC pi-filter to achieve a fairly quiet B+ voltage, which can span from 100V to 350V. The 5W series resistor (300, 1k, 1.5k, 10k supplied) can be replaced by an external choke. And just like the PS-4, the PS-3 can DC reference the heater regulator to ground or 1/4 of the B+ voltage or left floating, with only a shunting capacitor to ground. The PS-3 power supply PCB is equal to raw DC power supply portion of the PS-1 PCB and an H-PS-1 PCB welded together. It's B+ output voltage is not regulated, but then it is neither as expensive nor complex nor fragile nor as current-limited as the typical high-voltage regulator.

The low-voltage regulator’s power supply is flexible enough to allow either a conventional full-wave-bridge and full-wave center-tapped rectifier arrangement or a two-rectifier voltage-doubler configuration, allowing for more latitude in power transformer selection; this regulator can be set to either 6.3V or 12V or 12.6V.

PS-3 kit includes PCB, for standoffs with screws and O-rings, 16 capacitors, 10 rectifiers, 11 resistors (1/2W, 1W, and 5W), heatsink, and 20-page user guide.

Transformer not included.


Download user guide PDF
Triad VPT230-110 toroidal transformer
For USA sales only!

The Triad VPT230-110 toroidal transformer holds two secondaries and two primaries.

VPT230-110 Electrical Specifications (@25C) 1. Maximum Power: 25VA 2. Input Voltage: Series: 230VAC, 50/60Hz Parallel: 115VAC, 50/60Hz 3. Output Voltage: Series: 230VAC CT@ 0.11A

Parallel: 115.0VAC@ 0.22A 4. Voltage Regulation: 12% TYP from full load to no load 5. Temperature Rise: 30°C TYP 6. Hipot: 4000VAC, Primary to Secondary 7. Efficiency: 87% TYP. @ full load

The two secondaries allow two rectified B+ voltages to be created, either 165Vdc @ 100mA or 330Vdc @ 50mA. The two primaries allow this transformer's use with either 120Vac or 230-240Vac wall AC voltages.

This toroid is a great match with the PS-1 regulator, along with the TA050-12 12Vac toroid for the heater regulator portion of the PS-1. I should know, as I have used many of these toroids in the past. It could also be used with PS-3 or PS-15 or PS-18. It would also work well with the ACF-2 PCBs.

Because we charge a flat-rate of shipping, you will not be penalized for its high weight (1.102 lbs). This high-voltage toroid comes with the mounting hardware and large rubber washer
Availability: Usually ships in 2-3 business days
Triad VPT230-110 toroidal transformer VPT230