Thank you guys for the interest.
Below is another one I have bought. There might be more information about the amplifier. It seems Telefunken V304.
I have never seen this kind of tubes which are on the amps. I think it's going to be hard work to make it sound.
I am reading about impedance matching these days, but in this case,,,It is confusing.



SIEMENS SEV201W R?hrenverst?rker von 1937,perfekt!! | eBay

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Another sleepless night.
Kim JH