Hammond HL-2000A 2 kW Pep HF Linear Amplifier, Dual 3-500Z Triodes
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224-955-1644Key Features
- Two Eimac 3-500Z zero bias triodes, AB2 grounded grid
- SSB 2 KW PEP input; CW, RTTY, AM, ATV 1 KW input; continuous duty
- SSB/CW switch: 2,900 VDC SSB / 2,100 VDC CW plate voltage minimum
- Tube cool-down time delay circuit extends 3-500Z life
- 1,100 VA continuous duty Hammond HV transformer plus separate filament transformer
- Metering includes forward (2KW) and reflected (200W) power
- 120 VAC or 240 VAC line (240 VAC recommended)
- Circa 1980 design, no longer in production
The HL-2000A is a Hammond HF linear amplifier from around 1980, listed by the manufacturer as no longer in production. This page is a reference for amateur radio operators, restorers and collectors working with this two-tube model.
It uses two Eimac 3-500Z zero bias triodes operated AB2 in grounded grid service and covers the 80, 40, 20, 15 and 10 meter amateur bands (modification required for U.S. models). Ratings are SSB 2 KW PEP input and CW, RTTY, AM and ATV 1 KW input, at continuous duty. An SSB/CW switch optimises efficiency in all modes: SSB runs 2,900 VDC plate voltage minimum and CW 2,100 VDC minimum, both with resting current. Drive power is 75 to 125 watts.
The input circuit is 50 ohm Pi-input circuitry for each band and the output is a full Pi-L network. Cooling is forced air through a pressurized plenum and chimney using a continuous duty, low noise 60 cfm squirrel cage blower, and a time delay circuit cools the tubes down after power has been removed to extend the life of the 3-500Z triodes. Power comes from a special Hammond high voltage transformer designed for continuous duty at 1,100 VA, 60 Hz (28 lbs), a separate Hammond filament transformer and computer grade capacitors.
- Line voltage: 120 VAC or 240 VAC (240 VAC recommended)
- ALC: adjustable (negative) to -8 VDC
- Soft back-lit metering: left multimeter (high voltage, grid current, forward power 2KW or reflected power 200W), right meter fixed on plate current
- Interlock for input AC, 100% fused AC line and cathode circuit, primary HV and filament surge suppression
Overall dimensions are 9.25 in (235 mm) high, 17.25 in (438 mm) wide and 16.38 in (416 mm) deep, or 8.50 x 17.00 x 16.00 in (216 x 432 x 406 mm) less cabinet. The HL-2000A weighs 75 lbs (34 kg), or 87 lbs (39 kg) with cabinet.
Ideal For
- HF amateur radio amplification on 80 to 10 meters
- SSB, CW, RTTY, AM and ATV operation
- Restoration and servicing of classic Hammond linear amplifiers
- Pairing with the AT-1500 antenna transmatch
Overview
| Series | HL-2000A Series |
| Tuning | Vernier tuning on all bands; 0 - 100 dial skirt log for easy resetting |
| Part Number | HL-2000A |
| Product Type | HF Linear Amplifier |
| Band Coverage | 80 Meter, 40 Meter, 20 Meter, 15 Meter & 10 Meter amateur bands (modification required for U.S. models) |
| Production Status | Circa 1980 - No longer in production |
Dimensions
| Overall Depth | 16.38 in (416 mm) |
| Overall Width | 17.25 in (438 mm) |
| Overall Height | 9.25 in (235 mm) |
| Depth (Less Cabinet) | 16.00 in (406 mm) |
| Width (Less Cabinet) | 17.00 in (432 mm) |
| Height (Less Cabinet) | 8.50 in (216 mm) |
Electrical
| ALC | Adjustable (negative) to -8 VDC |
| Metering | Soft back-lit; left meter multimeter (high voltage, grid current, forward power 2KW or reflected power 200W); right meter fixed plate current |
| Duty Cycle | Continuous duty |
| SSB Rating | 2 KW PEP input |
| Drive Power | 75 watts to 125 watts |
| Line Voltage | 120 VAC or 240 VAC (240 VAC recommended) |
| Power Supply | Computer grade capacitors |
| Antenna Relay | DC relay for hum-free operation |
| Input Circuit | 50 ohm Pi-input circuitry for each band |
| SSB/CW Switch | For optimum efficiency in all modes |
| Output Circuit | Full Pi-L network |
| Tube Complement | Two (2) Eimac 3-500Z zero bias triodes |
| CW Plate Voltage | 2,100 VDC minimum - with resting current |
| Power Transformer | Special Hammond high voltage transformer, continuous duty at 1,100 VA - 60 Hz, weight 28 lbs |
| SSB Plate Voltage | 2,900 VDC minimum - with resting current |
| Filament Transformer | Separate Hammond filament transformer |
| Circuit Configuration | AB2 - grounded grid service |
| By-Pass Standby Switch | Front panel |
| CW, RTTY, AM, ATV Rating | 1 KW input |
Rack Mounting
| Feet | 1/2" high heavy duty rubber feet mounted on 1/4" dimples on cabinet |
| Rack Mounting | On a rack shelf (with proper ventilation), with or without outer cabinet |
Packaging & Shipping
| Weight | 75 lbs (34 kg); 87 lbs (39 kg) with cabinet |
Construction & Finish
| Front Panel | Painted smooth baked enamel - Hammond "Cream Beige" |
| Colour Scheme | Similar to the Rockwell Collins KWM-380 (released fall 1979); matched to the AT-1500 antenna transmatch |
| Outer Cabinet | Steel, painted textured baked enamel - Hammond "Earth Brown" |
Environmental & Protection
| Safety | Interlock for input AC; 100% fused AC line and cathode circuit |
| Cooling | Forced air; pressurized plenum and chimney cooling; continuous duty squirrel cage blower (low noise - 60 cfm) |
| Tube Cool-Down | Time delay circuit cools tubes down after power has been removed |
| Transient Protection | Primary HV and filament surge suppression |
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Frequently Asked Questions
Is the HL-2000A still in production?▾
No. It is listed as circa 1980 and no longer in production.
How does the HL-2000A differ from a single-tube amplifier?▾
It uses two Eimac 3-500Z zero bias triodes and is rated SSB 2 KW PEP input, with CW, RTTY, AM and ATV at 1 KW input.
What does the SSB/CW switch do?▾
It sets the plate voltage for optimum efficiency: 2,900 VDC minimum for SSB and 2,100 VDC minimum for CW, both with resting current.
What line voltage should I use?▾
It runs on 120 VAC or 240 VAC; 240 VAC is recommended.
How much does it weigh and how big is it?▾
75 lbs (34 kg), or 87 lbs (39 kg) with cabinet; overall 9.25 x 17.25 x 16.38 in (235 x 438 x 416 mm).
Can it be rack mounted?▾
Yes, on a rack shelf with proper ventilation, with or without the outer cabinet.
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