2 Tubes for the ACOM 2000A- 4CX800A -GU74B-RY-74B MATCHED pair- Russian Svetlana Tetrode Tube-price pair-the emphasis here is on the matching-its takes a little time no matter what to balance 2 valves.!
Cutting-Edge Technology Enhances a Classic Design. At the core of the ACOM 2000A is a classic HF amplifier design, that employs two
Svetlana Tetrode 4CX800A (GU74B) high-performance ceramic metal tetrodes operating in a grid-driven configuration.
This design was chosen for its inherent stability and extremely low production of spurious emissions. ACOM coupled this tried-and-true configuration with today’s most advanced digital control technology to create an amplifier with outstanding performance, features, and reliability.
Grid-driven tetrodes, cathode negative feedback, excellent transceiver loading (typically below 1.2:1 input VSWR), and
regulated SG voltage result in an extremely low distorted output. Measured typical IMD are – 40dB (3-rd order) and – 45dB (5-th. order). Classical Pi-L network, all-air coils (no ferrite), and carefully designed layout of the output tank offer typical harmonic emissions as low as – 55dBc (second) and below – 70dBc (third and above). Thus, the probability of QRM, BCI or TVI is dramatically minimized.