TUBES PAIR Matched, ACOM 2000A Svetlana Tetrode 4CX800A -GU74B-price per pair


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SKU: 4CX800A Category:


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.

Clean Signal
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.


Additional information

Weight1.5 kg

RF output: 1500-2000 W keyed carrier or SSB – no time limit. Constant carrier modes 1500W RF output – no time limit with auxiliary cooling fan.
Frequency coverage: All amateur bands 1.8-24.5 MHz. 28 Mhz only with modification by licensed amateurs.
Bandchange / Tuneup: Initial output matching process in less than 3 secs (typically 0.5 secs). Preset matching process / bandchange takes less than 0.2 second to move to different segment, same band and less than 1 sec for QSY to different band.
Tuning memories: Non-volatile for up to 10 antennas per frequency segment.
Drive power: Typically 50W for 1500W output.
Input impedance: 50 ohms nominal. VSWR <1.5:1.
Output tolerance: Up to 3:1 VSWR (2:1 on 160m) at full rated output before SWR protection circuit actuates. Higher SWR's tolerated at lower output.
Harmonics: At least 50 dB below peak output at 1500W.
Intermodulation: At least 35 dB below peak output at 1500W.
T/R and keying: Vacuum Relay: QSK capable.
Tubes and circuit: 4CX800A/GU74b tetrodes (2); resistive grid, PI-L output with RF negative feedback. Regulated screen grid voltage.
ALC: Negative going, grid derived, -11v max, rear panel adjustable.
Metering: Comprehensive. Remote Control Unit provides flexible monitoring of all amplifier operating parameters.
Protection: Grid and screen current limiting, power inrush (soft-start provided), trip to excessive reflected power, RF arcs, password access protection if needed, correct T/R sequencing, tube exhaust overheat, cover interlock and HV crowbar.
Fault diagnosis: Remote Control Unit display and LED's plus "INFO Box" for 12 most recent events. PC interface (RS-232), plus remote phone line interrogation feature.
Cooling: Full cabinet forced-air. Rubber isolated blower.
Transformer: 3.5 kVA with strip-wound Unisil-H? core.
AC power requirements: 100/120/200/220/240 VAC nominal. 50-60 Hz. 3500VA single phase at full power.
Physical: RF Unit: 17-1/4"W X 7"H X 17-3/4"D
-(440W x 180H x 450D mm).

-RCU: 5-1/4"W X 6-3/4"D X 1" H

-(135 X 25H X 170D mm).

-Shipped in two cartons total weight (96 Lbs/42.5kg). Plug in transformer for ease of installation and transport.

-No controls on RF unit except ON/OFF. RF unit may be located up to 3 metres (20m with optional cable) from RCU.



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