Linear Amplifiers

HF 800W+ linear amplifier

 AL-811H A$3499

Sold out!

Place your order with deposit for fast air-courier shipping ex-USA!

Pricing and availability subject to change due to stock, exchange
rate and freight cost variations.

• 160m to 10m band coverage, including WARC Bands
• RF negative feedback circuit improves linearity & stability
• Upgraded re increased stability and reduced spurious output
  by Andrews Communications
• Specially re-tuned for our Australian band segments by Andrews Communications
• Parasitic suppression circuitry optimised by Andrews Comms!
• 30m band performance greatly improved by our new tuning
• 10m/12m bands performance upgraded, for smoother tuning and ~50W more RF output!
• Checked by our spectrum analysers for spectral purity!
• We spend >3 hrs. to upgrade, re-tune and test each amplifier
• Tubes are selected to ensure equal RF power output sharing
• Inbuilt AC power supply
• Dual illuminated meters
• Tuned input coils
• Input swr on the 30m band may be up to 3:1, up to 2.5:1 on the 12m band and less than 2:1 on the other bands. These levels of input swr are usually easily overcome, as most radio amateurs who purchase HF linear amplifiers already own antenna tuners or own HF transceivers with inbuilt automatic antenna tuners
• Four inexpensive China-made 811A tubes fitted by Ameritron total 240W of plate dissipation. These 811A tubes may be branded RF Parts (RFP), Taylor, Ameritron or be unbranded!
  We don't guarantee Ameritron branded tubes will be fitted to AL-811H amplifiers by us or by Ameritron, or that we can supply Ameritron branded
  811A tubes. Ameritron doesn't mention any brand of 811A tubes they fit to AL-811H
  linear amplifiers!!
• Four fully neutralised 811A tubes provide increased stability, improved linearity and smoother amplifier tuning!
• RF output levels; SSB 800W+ (up to 900W~1,000W pep o/p
  on 40m/20m/15m), CW 600W
• Accurate peak power indication requires commercial true-peak reading RF wattmeter; Coaxial Dynamics 83000A, Bird, etc.
• Please limit the tune up periods to 5 seconds, each time. Allow the tubes to cool for at least 10 seconds in between each tune up period. To tune up, start with only 5W of carrier drive, then go to 20W of drive, then finally to 50W of drive.
  More tune-up info is below...

• When we list AL-811H linear
  amplifiers as being "In stock", they are fully ready for sale & can be brought to the shop on the day following receipt of your order, for immediate sale!
  
  
  
   

   

Heavy Duty HF linear amplifier
has 4 x 572B tubes providing 640W of total plate dissipation!

AL-811HD $4499

Sold out!

Place your order with deposit for fast air-courier shipping ex-USA!

Pricing and availability subject to change due to stock, exchange
rate and freight cost variations.

***************

We have traded in a
near-new AL-811HD amplifier! Contact us
for details or see our
Used Radios page.
Price...A$3499

***************

• 160m to 10m band coverage, including WARC Bands
• Utilises four rugged 572B tubes for high duty cycle operation!
  These four 572B tubes may be branded RF Parts (RFP), Taylor, Ameritron or be unbranded!
  We don't guarantee Ameritron branded tubes will be fitted to AL-811HD linear amplifiers by
  us or by Ameritron, or that we can supply Ameritron branded tubes. Ameritron does not mention any particular brand
  of 572B tubes they fit to
  AL-811HD linear amplifiers!!
• RF negative feedback circuit improves linearity & stability
• Upgraded re increased stability and reduced spurious output
  by Andrews Communications
• Specially re-tuned for our Australian band segments by Andrews Communications!
• Parasitic suppression circuitry optimised by Andrews Comms!
• 30m band performance greatly improved by our new tuning
• 10m/12m bands performance upgraded, for smoother tuning and ~50W more RF output!
• Grid Overload Protection (GOP) circuit recalibrated by us! 
• Checked by our spectrum analysers for spectral purity!
• We spend >3 hrs. to upgrade, re-tune and test each amplifier
• Tubes are selected to ensure equal RF power output sharing
• Inbuilt AC power supply
• Dual illuminated meters
• Tuned input coils
• Input swr on the 30m band may be up to 3:1, up to 2.5:1 on the 12m band and less than 2:1 on the other bands. These levels of input swr are usually easily overcome, as most radio amateurs who purchase HF linear amplifiers already own antenna tuners or own HF transceivers with inbuilt automatic antenna tuners
• Four fully neutralised 572B tubes provide increased stability, improved linearity, smoother amplifier tuning and 640W of total plate dissipation
• RF output levels; SSB 800W+ (up to 900W~1,000W pep o/p
  on 40m/20m/15m), CW 600W
• Accurate peak power indication requires commercial true-peak reading RF wattmeter; Coaxial Dynamics 83000A, Bird, etc.
• Please limit the transmit tune up periods to 5 seconds, each time. Allow the tubes to cool for at least 10 seconds in between each tune up period. 
  To tune up, firstly adjust the tuning capacitor for maximum RF power output possible with only 5W of drive, then un-key.
  Next, adjust the loading capacitor in one direction only (to increase loading) for maximum RF output, then un-key. If the RF output level reduces when adjusting the loading capacitor, then reverse the direction of adjustment. Keep repeating this two-step  (tune, then load) process, using drive levels of 5W, then 20W, then 50W and finally 100W. Tune for only 1~2 seconds at 100W drive!
  Always tune and load to achieve the maximum RF output possible. Don't adjust both the tuning and loading capacitors during any one tune up period.
• When we list AL-811HD amplifiers as being "In stock", they are fully ready for sale & can be brought to the shop on the day following receipt of your order, for immediate sale! 

        
AL-811H internal view

NOTES

 Insurance cover for goods in transit is available from us at only $2 per $100 value of goods. Please advise us if you require this option when ordering.

Please consider transit insurance because we are not responsible for loss of parcels or damage sustained by parcels - the carrier is responsible! We do pack well!

Please do NOT write <fragile> on anything you send to us as doing so greatly increases the risk of damage. Please try to "double-box" all items sent to us.

We don't offer any replacement warranties on any product.
Customer-caused damage is not covered by warranty, of course.

Please ensure you select the same band of operation of your linear amplifier as the band of operation of your transceiver. Also, please ensure that your amplifier's relay line is connected to your transceiver's relay socket.

We can repair your AL-811 series amplifier. We can greatly improve its stability, too! Contact us now!

Lee recommends that if you're considering purchasing a new or used Ameritron AL-811 series  linear amplifier from anyone or anywhere to make sure that all necessary upgrades have been properly completed, especially regarding the amplifier's parasitic suppression circuit design!

If you want a brand new AL-811 series amplifier retuned to favour either the very bottom or very top of a band then that can usually be done over a weekend. There is usually no charge for this retuning when purchasing a new AL-811 series amplifier, if it's requested prior to the actual sale.

Otherwise, retuning would be a chargeable after-sales service.

We would retune the applicable input tuning coil and re-set the PA output coil (if necessary), in order to achieve the lowest input SWR coincident with the highest RF output power level.

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AL-811HD report

Tommy says...My expectations are blown away by how well the AL-811HD works! I understand
you have put many hours into perfecting these amplifiers and
a wealth of knowledge, as well.
I can't thank you and the boys enough. I've been dealing with
you for many, many years and without doubt your services
and knowledge has not faded
but increases every time!

Best wishes, Tommy.

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Notes regarding the repairing of ageing linear amplifiers.

If your old AL-811 series linear amplifier doesn't already have a good parasitic suppression printed circuit board & good 811A tubes, along with being in good overall condition and less than 20 years old, then it may not be economical/worthwhile to repair! 

More and more customers are giving us older and older AL-811 series linear amplifiers, and other ageing valve/tube and solid-state linear amplifiers, to repair. As such ageing amplifiers develop more & more faults due to their ageing components, along with increasing operating hours and corrosion and oxidisation taking its toll, it's taking us longer to repair such amplifiers. Also, it's becoming increasingly difficult to obtain replacement parts for such amplifiers. Please keep in mind that the total repair cost is likely to be more than the few hundred dollars you may have just paid
for some ageing linear amplifier.
 
In many cases, we must firstly replace faulty or low emission valves/tubes, or damaged/failed RF transistors or FETs, when we commence the repair process...
and that's if the amplifier is even operational on its first inspection and test! Please note; we do not provide quotes regarding the repairing of any linear amplifiers.

After we accept an amplifier for repair (considering that some amplifiers are uneconomical or near-impossible to repair), our outstanding RF technicians will inspect and test the amplifier.
Often, we can then provide an estimate of the total repair cost.

The repair procedure may take several months to successfully complete, and especially so if we have to conduct many searches to find rare or special parts.

We do have some AL-811-series parts in stock, such as the main HT RF choke (A$79 @ 23-03-23),
HT electrolytic capacitors, etc.

Please note that 572B tubes can be quite expensive to purchase new, these days, due mainly to COVID related costs issues. Some Chinese tube/valve factories have suffered severe fire damage, too!

       ************************

RF POWER TRANSISTORS/FETs 

We have received some high RF output power transistors & FETs
from a few of our overseas
amplifier & radio manufacturers.
These particular devices may well
be the last of their type readily obtainable at sensible pricing!
We ordered these devices with
the main intention of supporting
our repairs to solid state 12Vdc
HF and HF/6m linear amplifiers!

These high power RF transistors & FETs are listed in a similarly titled chart halfway down this page...

If you have a faulty 12Vdc HF or HF/6m solid-state linear amplifier
and would like us to repair it then
please contact us. Often, we can
easily determine if your solid-state
12Vdc HF or HF/6m linear amplifier
is economically possible to repair.

Btw, extra-low noise MGF-1302
GaAsFETs in stock @ A$29 ea. 
 

ACOM 1500...$8199 AUD

 New 4CX-1000A type linear amplifier delivers
up to 1,500W SSB output on 160m~6m bands
 
Place your order with deposit

• Yes, covers 1.8~54MHz in amateur bands with up to 1,500W RF pep  output in SSB mode per band! Up to 1,200W RF carrier output in CW mode! Yes, the Acom 1500 covers the 60m band, too!
• Several reviews in USA indicate over 1.5kW RF output on SSB
• Actual pep and carrier output levels vary depending upon band
• Wide range of antenna tuning matches up to 3:1 antenna swr,
  so often there's no need for an external antenna tuner!!
• Includes one 4CX-1000A type tetrode that is optimised for class AB1 SSB linear amplifier service and delivers up to 1,500W SSB RF output
• Vacuum antenna relay!
• Has plate-load TRI (True Resistance Indicator) allows faster amplifier tuning and reduced false resonance tuning due to the Pi-L circuit
• New! Three (3) position antenna switching with three SO-239s fitted!
• New! VFD (vacuum fluorescent display) indicates operating conditions
• Virtually silent QSK CW operation
• Comprehensive protection and monitoring circuits
• Low input swr on all bands
• Very low 3rd order IMD and harmonic output levels
• Dimensions;422mm w x 182mm h x 355mm d. Weight; about 25kg.

ACOM 1500 internal view

Email received 17-04-19; Hi Lee! An update for you regarding the 1500. Works really well. Happily delivering 1500W+ in my favourite bands. Very happy! Thank you for your patience and understanding. Cheers, Wayne. 
 

ACOM 2100!

New $8799 AUD

160m-6m 1,500W RF output
linear amplifier

Place your order with deposit

• Yes, the rugged 2100 amplifier covers 1.8~54MHz in amateur bands with 1,500W continuous RF output in ALL modes!
• Several reviews in USA indicate up to 2,500W RF output on SSB,
  but this RF output level is yet to be proven & confirmed to be true
• Actual pep and carrier output levels vary depending upon band
• Does NOT cover the 60m band
• Wide range of antenna tuning matches up to 3:1 swr,
  so often there's no need for an antenna tuner!
• Has plate-load TRI (True Resistance Indicator) for fast
  amplifier tuning and reduced false resonance tuning
• Very low 3IMD/harmonic o/p
• One 4CX-1000A tetrode
  delivers up to 1,500W RF output per band
• Vacuum antenna relay
• Low input swr on all bands
• LCD display
• Comprehensive protection and monitoring circuits
• Dimensions;445mm w x 205mm h x 375mm d. Weight 29.3kg.

ACOM 2000A

New $13,499 AUD

160m-10m 2,000W RF output AUTOMATIC linear amplifier

Place your order with deposit

Automatic built-in Pi-L antenna tuner matches up to 3:1 SWR

• World's most advanced HF amateur automatic tuning tube/valve
  linear amplifier
• 2000A covers the 160m~10m (1.8~29.7MHz) amateur bands,
  including the WARC bands!
• Does NOT cover the 60m band
• One pair of rugged Chinese 4CX800A tetrodes
  deliver 1800~2000W RF output per band
• Actual pep and carrier output levels vary depending upon band
• Instantaneous automatic antenna tuning
• Wide range automatic antenna tuning matches up to 3:1 swr,
  so often there's no need for an antenna tuner!
• Sophisticated RS-232 digital hand controller with a LCD!
• Vacuum antenna relay
• Grid driven, low input swr, with cathode RF negative feedback
• Very low 3IMD/harmonic o/p
• Pi-L network with air-wound coils
• Comprehensive protection and monitoring circuits
• Dimensions;440w x 180h x450d (mm). Packed weight 36kg.

ACOM 2000A internal view

"Ecstatic" is the true feeling when amateurs operate ACOM's 2000A!
Many amateur say "It's easy to operate and it's very quiet, too!"
 

ACOM 1010

New $4499 AUD

160m~10m 700W RF output
linear amplifier

Place your order with deposit

• 1010 covers the 160m~10m (1.8~29.7MHz) amateur bands
• Yes, covers the 60m band!
• Excellent value for 700W o/p
• One Chinese 4CX-800A tetrode delivers up to 700W of RF output per amateur band
• Wide range of antenna tuning matches up to 3:1 swr. Often no need for an antenna tuner! 
• Has plate-load TRI (True Resistance Indicator) for fast amplifier tuning and reduced false resonance tuning
• Very low 3IMD/harmonic o/p
• Low input swr on all bands
• LED graphical displays
• Comprehensive protection and monitoring circuits
• Dimensions;406mm w x 150mm h x 315mm d. Weight 16kg.

ACOM 1010 internal view

ACOM 1000

New $5499 AUD

Place your order with deposit

160m-6m 1,000W RF output
linear amplifier

• 1000 covers the 160m~6m (1.8~54MHz) amateur bands
• Does NOT cover 60m band
• Up to 1,000W peak RF output
  in ALL modes!
• Wide range of antenna tuning matches up to 3:1 swr. Often no need for an antenna tuner!
• Has plate-load TRI (True Resistance Indicator) for fast amplifier tuning and reduced false resonance tuning
• Very low 3IMD/harmonic o/p
• One Chinese 4CX-800A tetrode delivers up to 1,000W RF output per band, including 6m!
• Vacuum antenna relay
• Low input swr on all bands
• LCD display
• Comprehensive protection and monitoring circuits
• Dimensions;422mm w x 182mm h x 355mm d.
• Weight; 22kg.
• The 1000P is a continuous frequency coverage linear amplifier model and is available upon us receiving your order with deposit.
  1000P amplifier...A$6999.
  This price is based upon the current exchange rate and air-courier costs and is subject to availability of the 1000P in 2023! 
  The 1000P covers 3~30MHz with no frequency gaps, but
  NO 160m or 6m coverage!
  Yes, the 1000P definitely
  covers the 60m/5MHz band!
  The 60m/5MHz band is not yet allocated to Australian amateurs.

***ALL-NEW***

ACOM 2020S...$13,899 AUD

160m-6m solid-state linear amplifier
with multi-colour remote controller.
Two LDMOSFETs for 1,500W output!

Please place your order with deposit

Info below is subject to confirmation!

ACOM 700S...$6499 AUD

160m~6m 700W solid-state linear amplifier!

Please place your order with deposit

• 700S covers all 160m~6m  (1.8~54MHz) amateur bands & 60m!
• Large 5" (108mm x 65mm high resolution multi-colour display of 800x480 pixels/24-bit colour displays over 10 parameters!
• Utilises the rugged MRFEV6VP61K25N LDMOSFET RF output device which is designed to withstand high swr loads
• Advanced control & protection board
• Covers all amateur bands from 160m to 6m!
• Frequency coverage is not continuous across all of 1.8~54MHz
• RF power output maximum of at least 700W (+/-0.5dB) SSB pep
  or carrier RF output on all bands
• RF power gain of 14dB +/-1dB (~40W input for 700W output)
• Harmonic and parasitic emissions output is better than -60dB
• Compatible with current amateur transceiver models
• Broadband input circuit with <1.2:1 swr from 1.8~54MHz
• Acceptable swr of up to 3:1 with proportional power reduction
  vs. swr. Full RF power output at up to 1.5:1 swr
• RF amplifier input swr <1.2:1. RF bypass input swr <1.1:1
• Automatic control and auto band changing possible from transceiver via CAT interface
• Remotely controllable by RS-232 interface
• Amplifier monitors the input signal's frequency and automatically
  band changes even when not connected to a CAT interface
• Ten (10) effective protection and monitoring circuits!
• The highly efficient cooling system may be slightly noisier than
  some other amplifier models' cooling systems
• Detailed data (55 parameters) re each of the last 28 hard-fault
  protection trips is stored in the amplifier's non-volatile memory
• Any transceiver driving RF into the 700S MUST have transmit delay timing of at least 20mS between initial key-down and RF output
  power actually occurring at the transceiver's RF output socket!
  Some transceivers have only 10mS delay!! Delay timing of <20mS
  may cause the 700S to instantly go into "protect" mode if it
  senses this operation to be what is often called "hot switching"
• The transmit delay timing is adjustable in 5ms steps in Yaesu's
  FTDX-101D and FTDX-101MP transceivers. Select <QSK Delay
  Time> in the CW settings part of the menu and adjust to 20ms or 25ms delay. The factory standard delay time setting is 15ms. QSK delay time will be the same in ALL modes! When CW keying speed is 45wpm or faster, delay time will be 15ms regardless of time setting
• The A700S must be well grounded. Solid-state linear amplifiers are often more sensitive than valve/tube amplifiers regarding RF signals
  intruding into their control and protection circuits. Antennas must
  be located well away from the amplifier and be well RF grounded.
  In fact, the whole station should be well grounded. Coaxial cables should have ferrite rings fitted. Vertically polarised HF antennas shouldn't be located close to high RF power output HF linear
  amplifiers as vertical antennas typically radiate a stronger local
  ground wave than horizontal antennas
• Coaxial cables should be any multiple of a half-wave on every operating band (taking into account velocity factor of the cable),
  noting the SWR at the antenna is repeated every half-wavelength
• The 700S requires a high quality shielded relay control cable and
  high quality coaxial connectors 
• The 700S is sensitive to detecting "hot switching"
• *Note; the "60m band" is NOT available to Australian amateurs
• Inbuilt switch-mode power supply
• Dimensions; 326mm w x 143mm h x 365mm d
• Weight; 11.8kg.
• LDMOSFET = laterally diffused metal oxide substrate field effect transistor
• See ACOM's website at www.acom-bg.com for more info...

New Acom 500S amplifier!!

ACOM 500S...$5299 AUD

160m~4m 500W solid-state linear amplifier!

Please place your order with deposit

• 500S covers all 160m~4m* (1.8~70.5MHz) amateur bands & 60m!
• Large 5" (108mm x 65mm high resolution multi-colour display of 800x480 pixels/24-bit colour displays over many parameters!
• Utilises a rugged LDMOSFET RF output device which is designed to withstand high swr loads
• Advanced control & protection board
• Covers all amateur bands from 160m to 4m!
• Frequency coverage is not continuous across all of 1.8~70.5MHz
• RF power output maximum of at least 500W (+/-0.5dB) SSB pep
  or carrier RF output on all bands
• RF power gain of 11.7dB +/-1.5dB (~35W input for 500W output)
• Harmonic and parasitic emissions output is better than -50dB below 30MHz and better than -70dB above 30MHz
• Compatible with current amateur transceiver models
• Broadband input circuit with <1.5:1 max. swr from 1.8~70.5MHz
• RF amplifier input swr is typically <1.2:1.
• RF bypass input swr <1.1:1
• Acceptable swr of up to 3:1 with proportional power reduction
  vs. swr. Full RF power output at up to 1.5:1 swr
• Automatic control and auto band changing possible from transceiver via CAT interface
• Remotely controllable by RS-232 interface
• Amplifier monitors the input signal's frequency and automatically
  band changes even when not connected to a CAT interface
• Many effective protection and monitoring circuits!
• The highly efficient cooling system may be slightly noisier than some other amplifier models' cooling systems
• Detailed data (55 parameters) re each of the last 28 hard-fault
  protection trips is stored in the amplifier's non-volatile memory
• Any transceiver driving RF into the 500S MUST have transmit delay timing of at least 20mS between initial key-down and RF output
  power actually occurring at the transceiver's RF output socket!
  Some transceivers have only 10mS delay!! Delay timing of <20mS
  may cause the 500S to instantly go into "protect" mode if it
  senses this operation to be what is often called "hot switching"
• The transmit delay timing is adjustable in 5ms steps in Yaesu's
  FTDX-101D and FTDX-101MP transceivers. Simply select <QSK Delay Time> in the CW settings part of the menu and adjust to 20ms or 25ms delay. The factory standard delay time setting is 15ms. QSK delay time will be the same in ALL modes! When CW keying speed is 45wpm or faster, delay time will be 15ms regardless of time setting!
• The 500S must be well grounded. Solid-state linear amplifiers are
  often more sensitive than valve/tube amplifiers regarding RF signals
  intruding into their control and protection circuits. Antennas must
  be located well away from the amplifier and be well RF grounded.
  In fact, the whole station should be well grounded. Coaxial cables should have ferrite rings fitted. Vertically polarised HF antennas shouldn't be located close to high RF power output HF linear
  amplifiers as vertical antennas typically radiate a stronger local
  ground wave than horizontal antennas
• Coaxial cables should be any multiple of a half-wave on every operating band (taking into account velocity factor of the cable),
  noting the SWR at the antenna is repeated every half-wavelength
• The 500S requires a high quality shielded relay control cable and
  high quality coaxial connectors 
• The 500S is sensitive to detecting "hot switching"
• *Note; the 60m & 4m bands are NOT available to Australian amateurs 
• Inbuilt switch-mode power supply
• Dimensions; 291mm w x 157mm h x 270mm d
• Weight; 11.6kg.
• LDMOSFET = laterally diffused metal oxide substrate field effect transistor
• See ACOM's website at www.acom-bg.com for more info...

*********************

• ACOM log-periodic antennas require order with deposit.
  Subject to availability.
   
•  LS-86 8 el., 6m boom...$POA
• LS-108 10 el., 8m boom $POA
• LS-1210 12 el., 10m b...$POA

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A sales receipt copy must accompany each warranty claim
Include your name, address, email and phone number

*********************

Listed prices subject to change without notice or obligation due
to exchange rate variations!