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OM Power OM2501A
A fully automatic 2.5kW HF linear amplifier equipped with a GU84B ceramic tetrode, with CAT integration, RF frequency sensing, automatic PA tuning, external antenna and filter control, LAN remote operation and full QSK.
Change Frequency. The Amplifier Follows.
The OM Power OM2501A covers the HF amateur bands from 1.8 to 29.7MHz, including WARC allocations, and is designed for fully automatic high-power station operation.
CAT communication or RF frequency sensing allows the amplifier to determine the operating frequency, select the correct band and recall the appropriate stored tuning condition automatically.
Proven High-Power Valve Technology
This ML&S version of the OM2501A is supplied with a single GU84B ceramic tetrode.
The GU84B RF stage delivers up to 2,500W in SSB and CW, with 2,000W in RTTY and FM, while retaining the fully automatic tuning and protection systems of the OM2501A platform.
Stored Tuning by Frequency Segment
The OM2501A automatically recalls amplifier tuning conditions according to the selected band and frequency segment, removing the need to manually retune the output network whenever the operating frequency changes.
OM Power specifies a response time of less than 0.5 seconds when moving within the same band and less than 2 seconds when changing bands.
Automatic Amplifier Tuning, Not an Antenna Tuner
The automatic tuning system adjusts the amplifier's own tuned RF output network. It does not replace an external antenna matching unit, so the antenna system, feeder, switches and connectors must still present an appropriate high-power load.
CAT or RF Frequency Sensing
OM Power specifies compatibility with Icom, Yaesu, Kenwood, Elecraft, Ten-Tec Orion, FlexRadio 6xxx and Apache Labs ANAN, together with Icom CI-V data supplied through compatible microHAM interfaces.
Where suitable CAT data is unavailable, the amplifier can detect transmitted RF and use that information for automatic band and frequency switching.
Full Output from Around 30-60W Drive
With approximately 17dB power gain, the OM2501A typically requires around 30 to 60W of RF drive for full rated output, depending on frequency, tuning and load conditions.
Automatic External Band-Pass Filter Control
The OM2501A provides band-data output for automatic control of compatible external band-pass filtering, making it particularly useful in contest and multi-radio installations.
The optional OM Power OM6BPF supports automatic switching from compatible OM Power automatic amplifiers.
Clean High-Power HF Output
OM Power specifies intermodulation distortion at better than -32dBc.
Harmonic suppression is specified at better than -50dBc.
Automatic Reflected-Power Protection
Maximum specified output SWR is 3:1. If reflected power reaches approximately 350W or higher, the amplifier automatically switches to STBY.
Input impedance is 50 ohms, with input VSWR specified below 1.5:1.
Monitoring the Complete Power Amplifier
The OM2501A monitors SWR, anode current and voltage, screen current and voltage, grid current and voltage, heater voltage, PA tuning and operating temperature.
Soft-start circuitry limits mains inrush and a cabinet safety interlock prevents normal switch-on while the amplifier is open. Faults and warnings are stored in memory to aid diagnosis and maintenance.
Automatic Bias Setup
Following replacement of the GU84B tube, the OM2501A can automatically establish the required anode-current bias, avoiding the need for a separate manual bias-adjustment procedure.
Remote Monitoring and Control
The OM2501A incorporates a Lantronix XPORT network interface for remote monitoring and control using OM Power's Windows software.
Factory network settings are 192.168.1.222 with subnet mask 255.255.255.0 and gateway 192.168.1.1. LAN ports 9999 and 10001 must be accessible for the remote-control software.
Two 2kVA Toroidal Transformers
The OM2501A uses two 2kVA toroidal transformers. Primary-voltage settings are switchable between 220/230/240V at 50Hz and 230/240/250V at 60Hz.
Other primary-voltage arrangements may be available for specific markets. The electrical installation must be suitable for the amplifier's mains demand and comply with OM Power's instructions and applicable electrical regulations.
Use Within Your Licence Conditions
The OM2501A's maximum RF capability may exceed the transmit power permitted by an operator's amateur-radio licence. Output power must always be set and operated within applicable licence conditions and local regulations.
OM2501A Downloads
OM Power provides the OM2501A user manual, automatic-tuning guide, remote-control software, firmware loader, firmware-upgrade instructions and current firmware through its official download centre.
View OM Power DownloadsOM Power OM2501A GU84B
Fully automatic 2.5kW HF linear amplifier equipped with a GU84B ceramic tetrode, CAT and RF frequency detection, automatic PA tuning, LAN remote operation, external antenna control and full QSK.
| Amplifier Type | Fully automatic GU84B ceramic-tetrode HF linear amplifier |
| Frequency Coverage | Amateur bands 1.8-29.7MHz including WARC bands |
| SSB / CW Output | 2,500W |
| RTTY / FM Output | 2,000W |
| Drive Power | 30-60W for full output |
| Power Gain | 17dB |
| Input Impedance | 50 ohms |
| Input VSWR | Less than 1.5:1 |
| Output Impedance | 50 ohms unbalanced |
| Maximum Output SWR | 3:1 |
| SWR Protection | Automatic STBY at approximately 350W reflected power or higher |
| Intermodulation Distortion | Better than -32dBc |
| Harmonic Suppression | Better than -50dBc |
RF Power Stage & Automatic Tuning
| Tube | 1 × GU84B ceramic tetrode |
| Automatic Tuning | Automatic band and frequency-segment PA tuning |
| Same-Band Response | Less than 0.5 seconds |
| Band-Change Response | Less than 2 seconds |
| Automatic Bias Setup | Supported following GU84B tube replacement |
| QSK | Full break-in operation |
| Automatic Radio Control | CAT plus RF-sensitive frequency detection |
| Supported CAT Manufacturers | Icom, Yaesu, Kenwood, Elecraft, Ten-Tec Orion, FlexRadio 6xxx and Apache Labs ANAN |
| microHAM Compatibility | Icom CI-V output from compatible microHAM devices |
| RF Frequency Detection | Automatic band and frequency switching where CAT is unavailable |
| Band-Pass Filter Control | Yaesu-compatible BCD band-data output |
| External Antenna Control | BCD control for up to 10 external antenna positions |
Protection & Monitoring
| Power Supply | High-voltage mains supply using two 2kVA toroidal transformers |
| 50Hz Primary Settings | 220 / 230 / 240V |
| 60Hz Primary Settings | 230 / 240 / 250V |
| Transformers | 2 × 2kVA toroidal transformers |
| Cooling | Centrifugal blower plus axial blower |
| Display | 4.3in colour touchscreen |
| LAN Interface | Lantronix XPORT XP1001000-05R |
| Factory IP Address | 192.168.1.222 |
| Factory Subnet Mask | 255.255.255.0 |
| Factory Gateway | 192.168.1.1 |
| Remote Software LAN Ports | 9999 and 10001 |
| Dimensions | 485 × 200 × 455mm, width × height × depth |
| Approx. Weight | 40kg |
| Fault Memory | Stored faults and warnings for maintenance and diagnosis |
| Cooling Modes | Three programmable operating modes for the axial blower |
Manufacturer Documentation
Download the OM2501A user manual, automatic-tuning guide, remote-control software, firmware loader, firmware-upgrade instructions and current firmware directly from OM Power.
View OM Power DownloadsShipping & Delivery
We offer UK and international delivery services, including next working day and selected weekend options for eligible orders. Available services, prices and estimated delivery times are displayed at checkout.
Delivery Information
Delivery options depend on the parcel's size, weight, contents and destination. Express and weekend services are subject to availability and cut-off times. Oversized or exceptionally heavy items may require a specialist delivery quotation.
Returns & Cancellations
To arrange a return, please contact ML&S or complete our returns form. You may also exercise your statutory right to cancel by email or another clear statement, without completing the form.
Changed Your Mind?
Under the Consumer Contracts Regulations 2013, most purchases made online or by telephone can be cancelled within 14 days of receipt.
You must notify us of your cancellation within this period and return the goods within a further 14 days.
Please handle all goods with care. Returned items must be in a resaleable condition, complete with their original packaging, and all supplied accessories.
You may inspect goods as you would in a shop. Handling beyond what is necessary to inspect them may result in a lawful deduction for diminished value.
Exceptions
Modified Equipment & Reversal Charges
Additional return conditions may apply to equipment modified at the customer's request, including wideband transmit or receive modifications.
ML&S may charge a reasonable fee to reverse physical modifications and restore the equipment to its original factory specification. Any such charge will be agreed in advance and deducted from your refund.
Custom-Made Cable Assemblies
Coaxial cable assemblies manufactured to a customer's specifications are excluded from the 14-day return policy and are non-refundable unless faulty.
Software & Labour Charges
Labour and modification charges requested by the customer are non-refundable once the work has been completed.
Computer software may only be returned under the 14-day return policy if it remains sealed and unopened.
Return Postage Charges
Customers are responsible for the direct cost of returning unwanted or incorrectly ordered goods, where permitted by law. You may arrange your own suitable return postage or use one of our optional prepaid services.
Standard Parcels
Royal Mail Return Label
£5.95
Per parcel
For eligible standard-sized parcels, subject to Royal Mail restrictions. Free collection included.
Larger Parcels
DPD Return Label
£7.95
Per parcel
For larger or heavier parcels and any shipments with batteries.
Collection Service
DPD Collection
£25.00
Per parcel
Available upon request for eligible addresses, subject to availability.
Prepaid return charges will be confirmed before booking and deducted from your refund.
These prices apply to eligible UK mainland returns. Oversized items, specialist products and returns from other destinations may require a separate quotation. Estimated return costs will be disclosed before purchase.
Faulty or Incorrectly Supplied Goods
Return postage charges do not apply to faulty, damaged or incorrectly supplied goods returned under statutory rights. ML&S will arrange a free return in these circumstances.
Refunds
Refunds are processed without undue delay following receipt and inspection of returned goods, and no later than 14 days after we receive goods returned under statutory cancellation rights.
Refunds will be issued to the original payment method. Any prepaid return postage charges or lawful deductions for diminished value will be itemised.
Warranty Terms & Conditions
New Equipment Warranty
Minimum 2-Year Warranty
All new products supplied by ML&S carry a minimum two-year warranty against manufacturing defects, excluding batteries, which are covered by separate warranty terms.
Some manufacturers provide extended warranties, such as the three-year warranty available on eligible Yaesu equipment. Any additional coverage is subject to the manufacturer's terms and conditions.
Our workshop may assess and repair faulty equipment on site or refer it to the manufacturer or an authorised service centre where necessary.
Warranty exclusions may include batteries, normal wear and tear, accidental damage, misuse and unauthorised modifications, as specified in the applicable warranty terms.
All warranties are provided in addition to your statutory consumer rights against ML&S, which are not limited by the warranty period.
International Returns & Warranty
Unless otherwise stated, ML&S warranty servicing is carried out in the UK. International customers must contact us before returning goods to confirm shipping and customs requirements.
International customers are responsible for return postage unless the goods are faulty and ML&S has been notified within a reasonable time.
ML&S accepts no responsibility for additional charges resulting from incorrectly completed customs documentation. Any additional duties charged to ML&S as a result will be billed to the customer before return of the goods.
Need Help With a Return?
Our team can assist with returns, postage arrangements, modifications and warranty claims.
Nothing in these terms excludes or limits your statutory consumer rights.