It's been a while since I built 45 power amps with 45 as driver tube.
Here a pair of newly finished amplifiers in that configuration.
About to be shipped to their new owner in the US.
The amplifiers use a 45 in the single ended output stage, delivering about 2W.
The output tube is driven by another 45 through an interstage transformer.
The input transformer offers the possibility to have a balanced XLR input.
The amps have been constructed in the tower style chassis using all the latest construction techniques which evolved over the years.
A few photos showing the construction process, starting with the raw top plate.
Sockets and meter mounted:
Some components are mounted underside of the top plate via threaded blind holes:
Adding the capacitors which are closest in the signal path:
Interstage and output transformers reside on a separate sub assembly along with more capacitors and chokes:
The power supply section:
LCL filtered filament supplies for zero noise operation even on the most efficient speakers.
Adding the sub assemblies layer by layer, with additional plates in between for mechanical ruggedness:
The completely assembled amp, without enclosure, ready for testing:
Some more pics