The bias supply is a typical cascaded RC filter following a full bridge. In either case, a DC-stand-off is provided for a 30db reduction of heater noise. Otherwise, the traditional 6V-only heater wiring can be accommodated. The London Power 6V/12V heater configuration allows the actual heater wiring to be small-gauge wire, typically #20 or #22.
The paralleled main filter cap positions provide ample ripple filtering and long life, and is followed by an active hum filter to reduce supply-borne noise to inaudible levels These low-noise PSUs can be used to support large numbers of preamp tubes, such as for a mixer or multi-channel active cross-over. For example, match the PSU-25 to PA66-25 for a 25W amplifier. Our own PTs are named to indicate the audio power that can be produced with a matching PA66 variant. The generic PSU for tube power amp ( PSU-TPA) can be used with modern or traditional power transformers. Most voltages required for London Power’s tube power amp kits such as the PA66-series require 500Vdc or less, fitting in well with available capacitors. DC stand-off for heater supply (linkable option).active hum filtering for high-voltage plate supply.The PCB accommodates wiring for world-wide mains compatibility. These supplies are so good, we use them in our own amplifiers! London Power’s super-quiet PSU power supply unit provides an integrated power supply solution that is compact while providing extremely clean support for tube audio circuitry. Tube power amplifiers require various voltages for the plate circuit, bias and heaters. Cathode-Bias/Fixed-Bias Switching in Tube Power Amps.RBX Raw Bias Auxiliary Supply – When Do You Need It?.Power Scaling for Tube Amplifiers – Q&A.Independent Reviews of The Ultimate Tone Book Series.Hammond Transformers for Tube Audio Amplifiers.
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