These are seriously Bad Boys and are not for the faint-hearted.
And aren’t they gorgeous!! ….
Power valves are 572-3 triodes. They glow very brightly and are hugely impressive in a darkened room. The full valve complement is 6SN7, 6DN7, 572-3 and a 5U4-GB rectifier tube behind the 572-3.
This is really a tale of taming these Bad Boys with valve-rolling, I had a bit of a love/hate relationship with these amps.
The Svetlana 572-3 power valves are a fixture, no-one else made these valves, so it’s the small valves that must perform the sound-tuning duties. Internet rumour had it that the power valves were no longer obtainable – not true, I found a reliable and good value source in the USA quite easily and I got a spare pair of valves immediately. Why don’t people use a decent search engine? More »