• 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.

Are these tubes worth annything?

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Hi there.

Check the picture. I am thinking of trading these tubes to a local here in denmark. It is a bit hard to determin the value of them, so please help if you can.
The first tube with clear glass is marked "Philips D11, 35V, 30-75V"

The second tube with mirror glass is marked MAZRADIA on the cheramic socket and 6\100 AMP on the glass. They are both direct heated triodes, as they have four leags. What is the value of these tubes?

Thanks Peter Jensen, Denmark.
 

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