Hammond HL-1000A 1 kW HF Linear Amplifier, Single 3-500Z Triode
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224-955-1644Key Features
- Single Eimac 3-500Z zero bias triode, AB2 grounded grid
- SSB 1 KW PEP input; CW/RTTY 1,000 W; AM 500 W; continuous duty
- 80, 40, 20, 15 and 10 meter amateur bands (U.S. models need modification)
- Forced air plenum and chimney cooling with low noise 60 cfm blower
- 800 VA continuous duty Hammond HV transformer plus separate filament transformer
- AC interlock, fused AC line and cathode circuit, surge suppression
- 120 VAC or 240 VAC line; adjustable negative ALC to -8 VDC
- Circa 1980 design, no longer in production
The HL-1000A is a Hammond HF linear amplifier from around 1980, listed by the manufacturer as no longer in production. The original 1980 manual describes it as a one-stage, self-contained table top unit capable of 1000 watts input, and this page serves as a reference for restorers and collectors.
It uses a single Eimac 3-500Z zero bias triode operated AB2 in grounded grid service. Band coverage is the 80, 40, 20, 15 and 10 meter amateur bands (modification required for U.S. models). Ratings are SSB 1 KW PEP input, CW and RTTY 1,000 W input and AM 500 W input to allow sufficient headroom, all at continuous duty. Drive power is listed as 40 to 75 watts on the current series sheet and 75 to 125 watts in the 1980 brochure. Plate voltage is 2,400 VDC minimum with resting current, and intermodulation distortion is in excess of -33 dB.
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. A special Hammond high voltage transformer designed for continuous duty at 800 VA, 60 Hz (21.5 lbs) and a separate Hammond filament transformer feed a supply with computer grade capacitors. Safety features include an interlock for input AC, a 100% fused AC line and cathode circuit, and primary HV and filament surge suppression.
- Line voltage: 120 VAC or 240 VAC
- ALC: adjustable (negative) to -8 VDC
- Soft back-lit metering: left multimeter (high voltage, grid current or relative forward RF power, 1 KW), right meter fixed on plate current
- Front panel by-pass standby switch and DC antenna relay for hum-free operation
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. It weighs 56 lbs (25 kg), or 68 lbs (31 kg) with the steel cabinet, and can be rack mounted on a rack shelf with proper ventilation.
Ideal For
- HF amateur radio amplification on 80 to 10 meters
- SSB, CW, RTTY and AM operation
- Restoration and servicing of classic Hammond linear amplifiers
- Pairing with the AT-1500 antenna transmatch
Overview
| Series | HL-1000A Series |
| Tuning | Vernier tuning on all bands; 0 - 100 dial skirt log for easy resetting |
| Part Number | HL-1000A |
| 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 |
| Band Ranges (1980 Manual) | 80 m 3.5-4.0 MHz; 40 m 7.0-7.3 MHz; 20 m 14.0-14.35 MHz; 15 m 21.0-21.45 MHz; 10 m 28.0-29.7 MHz |
| Frequency Range (1980 Brochure) | 3.5 MHz to 29.5 MHz (amateur bands) |
| Expanded Coverage (1980 Brochure) | May be expanded for MARS, government or other services (consult factory) |
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 or relative forward RF power 1KW); right meter fixed plate current |
| AM Rating | 500 W input (to allow sufficient headroom) |
| Duty Cycle | Continuous duty |
| SSB Rating | 1 KW PEP input |
| Line Voltage | 120 VAC or 240 VAC |
| Power Supply | Computer grade capacitors |
| Antenna Relay | DC relay for hum-free operation |
| Input Circuit | 50 ohm Pi-input circuitry for each band |
| Plate Voltage | 2,400 VDC minimum - with resting current |
| Output Circuit | Full Pi-L network |
| CW, RTTY Rating | 1,000 W input |
| Tube Complement | Single (1) Eimac 3-500Z zero bias triode |
| Power Transformer | Special Hammond high voltage transformer, continuous duty at 800 VA - 60 Hz, weight 21.5 lbs |
| Filament Transformer | Separate Hammond filament transformer |
| Circuit Configuration | AB2 - grounded grid service |
| By-Pass Standby Switch | Front panel |
| Drive Power (Series Sheet) | 40 watts to 75 watts |
| Intermodulation Distortion | In excess of -33 dB |
| Drive Power (1980 Brochure) | 75 W to 125 W |
| Input Match (1980 Brochure) | 50 ohm (16 dB return loss) |
| RF Input Connector (1980 Manual) | SO-239 |
| RF Output Impedance (1980 Manual) | 50 ohms nominal; do not operate into SWR greater than 2:1 |
| Harmonic Suppression (1980 Brochure) | -40 dB depending on exciter; utilizes RF inverse feed-back |
| Multimeter HV Full Scale (1980 Manual) | 3000 VDC |
| Multimeter Grid Full Scale (1980 Manual) | 150 mA DC |
| Primary Current At Standby (1980 Brochure) | 4.5 A |
| Primary Current At Full Load (1980 Brochure) | 14.0 A |
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 steel cabinet |
Packaging & Shipping
| Weight | 56 lbs (25 kg); 68 lbs (31 kg) with steel cabinet |
| Weight (1980 Brochure) | 65 lbs (30 kg) |
| Accessories (1980 Manual) | Instruction manual, warranty card, shielded control cable, extra fuses |
| Tube Shipping (1980 Manual) | 3-500Z triode shipped separately; must be installed before operation |
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) |
| Transient Protection | Primary HV and filament surge suppression |
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Frequently Asked Questions
Is the HL-1000A still in production?▾
No. It is listed as circa 1980 and no longer in production.
What tube does the HL-1000A use?▾
A single Eimac 3-500Z zero bias triode, operated AB2 in grounded grid service.
What power levels is it rated for?▾
SSB 1 KW PEP input, CW and RTTY 1,000 W input, and AM 500 W input, all continuous duty.
What line voltage does it need?▾
120 VAC or 240 VAC. The 1980 manual notes it came factory wired for 120 VAC single phase and could be re-wired for 230 VAC using jumpers on the power transformer terminal strip.
How much drive power does it need?▾
The current series sheet lists 40 to 75 watts; the 1980 brochure lists 75 W to 125 W.
Can it be rack mounted?▾
Yes, on a rack shelf with proper ventilation, with or without the outer steel cabinet.
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