An Hf309 is a monoblock with two EL84 as an ultra linear balance output stage.
These are the detail photos of the chassis.
The chassis was home made after Philips' design.
The underside of the chassis. Simple but effective.
The construction of a monoblock.
Measurements on the phase shifter of the amplifier.
The measuring setup with the connections of the scope.
The first test Chinese cables for the connections.
Just listen to the first result.
And then it is the turn of the second monoblock.
The top view of the amplifiers.
A photo report of an amplifier.
The side view of the amplifier.
The bottom of the amplifier.
The other side of the amplifier.
Where there can be one amplifier there can also be two....
And here is a test setup.
And listen with me again. It just sounds crazy.
And of course it needs a housing around it.
The side of the housing. Oh well, sometimes it's nice when a plan comes together.
The speaker connections and the audio input.
The complete set. consisting of Fm13 HF306 and two self-built HF309.
Here's an idea of how the housing is put together.
And then the question always arises, what would it look like at night?
