We supply MercuryIIIS HF Linear Amplifier ready to operate. 

Request Form below:


Fully Assembled Warranty:  KM3KM Electronics LLC warrants the mercuryIIIS to be free from defects in material and workmanship. Your mercuryIIIS is tested before shipping to be 100% sure everything works as described.

COVERED: Your mercuryIIIS is covered under normal use and service for a period of one (1) year from the date of delivery shipping included to the first buyer. Warrantee is not transferable as indicated in the Terms and Conditions

NOT COVERED: Warranty does not cover if your mercuryIIIS has been subjected to damage from natural causes such as lightning, water, flood, fire and other catastrophes. Warranty does not cover damage from improper installation application, vandalism or overdriving with more than 60 Watts in accordance with the operating specification, as determined by internal logging system.

KM3KM Electronics LLC warrants that the LDMOS device shall be new from manufacturer and will be free from defects in materials and workmanship under normal application, for a period of one (1) year from the date of delivery to the first buyer, subject to the exclusions and limitations set out below.

LDMOS failure due to operator error during operation or installation as determined by internal logging system installed in the software, will be replaced at the cost of the customer, note that we will not charge labor to replace LDMOS or any other repair during or after the warranty expires. Customer will pay for parts and shipping after warranty expires. Free Labor will also apply to second hand MERCURY PRODUCT owners..

 When sending in the mercuryIIIS for service within the warrantee period, please pack it carefully preferably in the original box and packing materials, KM3KM will send you a shipping label during the warrantee period. Please include a note with your name, address, e-mail and phone number, that clearly describes the problem. When the amplifier is returned to the factory and an examination of the mercuryIIIS discloses solely in KM3KM’ s judgement to have been defective during the Warranty Period, it will be repaired and shipped back at no cost to the costumer. However, if it is deemed that it is not due to failure due to manufacturing, material or workmanship the costumer will be charged for parts return and original shipping.


Fully Assembled total price $2,799 + Shipping within the continental US and Puerto Rico.

A deposit of $1,200 will be required to begin the manufacturing process of your order. Then the balance when the order is close to being shipped.

We supply mercuryIIIS ready to operate. The only thing we do not ship the C14 type power cord because many electrical outlets are different. KITS HAVE BEEN DISCONTINUED.

Our product manufacturing and assembly is done in Florida USA. All components are genuine and highest quality.
• Operating Bands 160m – 6m (Ham Bands)
• RF Auto Band Decoding
• 7-inch Color Touch Screen
• DI Voltage/DI Current Meter
• All Protection
• Selection for 3 Antennas w/Memory.
• 1200 watts SSB/CW
• 700 watts DIGI mode
User Manual Download

Harmonics Measurements Download


Due to the large number of requests and the manufacturing capacity affected by Covid-19, we have opted to maintain a waiting list to be able to make sure we can place a mercuryIIIS in the shack of every amateur radio operator who wants one. The wait may be 1 year, and may decrease due to non-response from applicants or an increase in our 2023 production, we thank you so much for your patience. The deposit is not needed to be placed on the list, when your name comes up we will send a payment link to process your order.
Please fill the form below to be added to the list, we will confirm by e-mail as soon as possible.
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