6DN3 Damper Tube from American General Electric
Behind the 6DN3 tube is the main transformer. To the left is an EL34 output tube (by Philips, produced by RFT).
In the lower right-hand corner a 6CS7 driver tube. And to the right one of two switches that makes it possible to chose from output tubes from the EL34 or 6L6 families of tubes.
In the background is a cheap Chinese DAC (Digital Audio Converter) by Topping.
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