For this amplifier the frequency and phase responses ... And it sounds, well, like my hi-fi system. No special “warm valve sound”, but it did give me the momentary cachet of a pair of glass ...

Taking a straightforward approach, using as little math as possible and lots of design know-how, this practical guide provides design principles and construction techniques so readers can devise and ...

The Copland CTA407 is a fuss-free valve amplifier designed for one thing and one thing alone: solid audio performance. It is also interesting as the CTA407 is the only all-valve stereo amplifier ...

It is also interesting as the CTA407 is the only all-valve stereo amplifier Copland currently makes. Though Copland has been conservative in how far it pushes the amp – designing it to run 50 watts ...