Philips HF309

Radiotechniek album
Philips HF309 foto 1
An Hf309 is a monoblock with two EL84 as an ultra linear balance output stage.
Philips HF309 foto 2
These are the detail photos of the chassis.
Philips HF309 foto 3
The chassis was home made after Philips' design.
Philips HF309 foto 4
The underside of the chassis. Simple but effective.
Philips HF309 foto 5
The construction of a monoblock.
Philips HF309 foto 6
Measurements on the phase shifter of the amplifier.
Philips HF309 foto 7
The measuring setup with the connections of the scope.
Philips HF309 foto 8
The first test Chinese cables for the connections.
Philips HF309 foto 9
Just listen to the first result.
Philips HF309 foto 10
And then it is the turn of the second monoblock.
Philips HF309 foto 11
The top view of the amplifiers.
Philips HF309 foto 12
A photo report of an amplifier.
Philips HF309 foto 13
The side view of the amplifier.
Philips HF309 foto 14
The bottom of the amplifier.
Philips HF309 foto 15
The other side of the amplifier.
Philips HF309 foto 16
Where there can be one amplifier there can also be two....
Philips HF309 foto 17
And here is a test setup.
Philips HF309 foto 18
And listen with me again. It just sounds crazy.
Philips HF309 foto 19
And of course it needs a housing around it.
Philips HF309 foto 20
The side of the housing. Oh well, sometimes it's nice when a plan comes together.
Philips HF309 foto 21
The speaker connections and the audio input.
Philips HF309 foto 22
The complete set. consisting of Fm13 HF306 and two self-built HF309.
Philips HF309 foto 23
Here's an idea of how the housing is put together.
Philips HF309 foto 24
And then the question always arises, what would it look like at night?