I haven't built any of those since a while, here is a new version of a single ended stereo amplifier which can use either a 45 or 2A3.
The amplifier comes in two chassis, one for the amp itself and a separate power supply. Here the amplifier section:
It is interesting how the requests for landscape style chassis have increased lately.
Here a top view of the amp:
The selector switch for the output tubes is hidden in the corner between the tubes and the transformers. The output tubes are AC heated. Hum can be nulled through hum bucker pots. This particular build has both balanced and RCA inputs selectable by the switch between the driver tubes (6N7), alternatively the 6J5 can be used as driver without any mods. The use of the 6J5 results in about 3dB less gain.
The bias current of the output tubes is monitored through vintage panel meters.
Check out these beauties, vintage meters made by Weston in perfect condition, hard to find these days.
The complete set with power supply:
The amplifier is transformer coupled with Tango transformers. Balanced to SE conversion from the XLR inputs is done through Lundahl input transformers.
The power supply uses 4 TV Damper tubes in a full wave bridge arrangement. A trusted concept which is used in most of my amps and preamps.
Multiple choke / capacitor filter stages with oil caps throughout. No electrolytic caps or silicon in this amplifier.