• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Unknown tube, need help to identify!

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Freitsu

Member
Joined 2011
Hello fellow enthusiasts! First post. :)

I've found a valve that seems to be in working condition (heater works) but all the info on it is long gone... :(

Maybe you can help me identify this beauty?
It has a B5 base.

Pic:

P8202540.jpg
 
I

izozaya

Member
Joined 2011
The fact that you can see the heater glowing in full suggests that it is a directly heated type; that rules out the 807 and other IHT types.

I have seen that type of cylindrical wide mesh anode in some industrial diodes, but can't recall the types right now. Try to spot any grids in the inside, that will narrow the search significantly.
 
F

Freitsu

Member
Joined 2011
v4lve lover said:
AF2 AF2 from the 30s prewar and in nice condition but i cannot think its philips made

its a HF penthode/selectode

edit its suposed to glow at 4 volts instead of 6 . note the grid around the outer metal supports probably some sort of RF screening .
Click to expand...

Thanks for identifying this piece of history!

It will add nicely to my small collection of tubes on the shelf. :D
 
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