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Display Unit for Elecraft's KPA500: The Digital Display Unit for Elecraft's KPA500

A compact, easy to read KPA500 Digital Display Unit (DDU). It allows the monitoring of five crucial readings all at the same time.

The DDU measures only 4X4X2 with an easy to read 2 line display that can be located at the operating position and the KPA500 located up to 100 feet away.

The DDU is designed with the following features:

Easy to read 2 line display
No USB or serial cable to computer
No com port in Windows to manage
No computer needed
Plug and Play
Simply connect the supplied DC power cable to power supply and PC data jumper cable to the KPA500
Retains all functions of the KPA500 front panel
All displayed info obtained directly from the KPA500

Newest Hardware and Software. $199 plus $10 shipping.; Listing #1744811 - Submitted on 10/01/25 by Callsign KV5J, Modified on 10/18/25 - IP: 172.56.65.250; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
FOR SALE: HARDROCK50+ tuner+705 interfac: Hi folks. Decided to sell my Hardrock 50 with tuner and 705 interface . I have only occasionally used it . I am the original owner and have over 50 years in the radio electronics industry as an engineer.
Offering it at $450. Or offer. Located in northern Illinois. Shipping is possible. Serious buyers please contact me for additional pictures.
73
Kb9qfi
Tony; Listing #1746718 - Submitted on 10/18/25 by Callsign KB9QFI - IP: syn-023-087-009-126.res.spectrum.com; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Acom 1000 HF/6m Amplifier: Very clean and full rated output
Original box, manual and optional accessory fan
Currently wired for 240v
******
Local pickup prefered
$1875; Listing #1746715 - Submitted on 10/18/25 by Callsign W8UAB, Web Site: https://swap.qth.com/search-results.php?keywords=W8UAB&fieldtosearch=Call - IP: 104-169-198-75.bng02.nrwl.oh.frontiernet.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Amp Supply LK500ZC: Amp Supply LK-500ZC
LOCAL PICKUP ONLY in NorthWest NJ 07825.
I will arrange to demo it for you on pickup.
PayPal is fine. Discount for Cash.
Solid 2-tube 3-500Z amp, covers 160 to 10 meters.
Excellent condition. Recently replaced 3-500C (3-500ZG) tubes. (old photo)
Step start Harbach board
Updated Metal Oxide resistors in parasitic suppressors.
C-Core (Hypersil) Transformer
updated Harbach HV board with 8 capacitors
updated fan for quiet operation includes Hi/Lo switch
updated HV choke with Ameritron RFC3
heavy duty anode homebrew caps
Wired for 120 VAC can be wired for 240VAC - includes the factory jumper.
~1300W output max; less on 10m.
$1500; Listing #1746714 - Submitted on 10/18/25 by Callsign AB2NI - IP: ool-ad03d8f4.dyn.optonline.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Ameritron AL-811H: I am selling my 811 H amplifier,the amplifier is about 10 years old in those 10 years maybe 40 hours use.
The amp is in good condition and transmits on all ham frequencies including 10 meters . The sale will include the ARB 704 interface .
And also will include a Palmar at-1500 antenna .
Price is reduced to $825.00 for the package!
This must be a local pickup at my house .
NO SHIPPING! I live in New Bern Nc
Text message or call me for more information Ray KA3PCX.
Will split amp from tuner amp price 625.00
I have a copy of the manual and also the box.; Listing #1746444 - Submitted on 10/16/25 by Callsign KA3PCX, Modified on 10/18/25 - IP: 46.110.152.20; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Wanted Transformer for Henry Amp: Looking for a power transformer for a Henry 1KD-5 desktop amplifier. Peter Dahl PWDP13033 or or Original part number is ECA1111.Would like to get this amp running.; Listing #1746699 - Submitted on 10/18/25 by Callsign W4TJA - IP: 209.112.70.33; Click to Contact -- Send this Ad to a Friend
ACOM 2000A: Selling a Brown model that has been completely gone through by an ACOM authorized Tech had a tube go bad . In addition to the amp I have a NOS 4cx800 that will be included . Amp is in great operating and cosmetic condition.
$3700 FIRM WILL DRIVE A REASONABLE DISTANCE TO MEET IF POSSIBLE .; Listing #1746564 - Submitted on 10/17/25 by Callsign K8ZP, Modified on 10/18/25 - IP: 172.59.116.204; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Heathkit SB220: I inherited a family members VERY CLEAN Heathkit SB220.
As it wasn’t on the air for many years, I undertook a total upgrade to bring it up to current specs.
It includes the newly installed SB220 Harbach Master kit
HARBACH FB220 filter caps and bleeder resistor board
HARBACH RM220 metering board
HARBACH FM220 fan
HARBACH Parasitic suppressors
HARBACH Ohmite glitch resistor
HARBACH 220 axial electrolytic cap
HARBACH BRK-220 circuit breakers and RF bypass caps
HARBACH New meter lamps
HARBACH Soft Key kit SK220
HARBACH Soft Start SS-221-240 kit for 240v (included but NOT INSTALLED) as this version is specific for 240v)
If you decide to wire it for 110v, Harbach sells the 120v version
HARBACH Doorknob cap
HARBACH SO239 input and output coax connectors
Bias mod wired
Grounded the 3-500z grids
New rubber feet (white)
I have tested it and it shows 1300w pep output on high voltage SSB
And over 1000w cw low voltage keydown
I am selling it for $1600 FIRM plus shipping
Bob Kogen, W6DN; Listing #1746692 - Submitted on 10/18/25 by Callsign W6DN - IP: 104-53-136-248.lightspeed.irvnca.sbcglobal.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
OM POWER OM-2501A: Hello,
I have a OM-2501A amp for sale.
It is in excellent condition and 100% operational.
I have moved on to the Flex amp to go with my radio so this is in excess to my needs.
Specification of OM2501A:
Frequency coverage: Amateur bands (1.8 – 29.7) MHz including WARC
Power output: 2500 W in SSB and CW on HF bands,
2000 W in RTTY/FM
Input Power: 30 to 60 W for full output power
Input Impedance: 50 ohm, VSWR < 1.5 : 1
Power Gain: 17 dB
Output Impedance: 50 ohm unbalanced
Maximum Output SWR: 3:1
SWR protection: Automatic switching to STBY when reflected power is 350 W or higher
Tube: 1 EACH FU-728F Ceramic Tetrode installed
Price is $3850 plus $150 shipping.
May take trade for Flex Radio equipment.
Thanks for looking; Listing #1746684 - Submitted on 10/18/25 by Callsign W5IB - IP: 104.28.50.134; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
QRO HF-2000 / 160 to 10 1KW ++ $2400: QRO HF-2000 Linear Amplifier 100% Not a Mark on it > Legal Limit ++ from a 2 X 3-500 ZG Tubes ( New This Year) > also comes with a New Matched Pair of Taylor 3-500 Tubes in the Box > Have the Boxes for the Amp WILL NOT SHIP / Have the Manual / with work sheets / Peter Dahl Transformer 4100 Volts on the Plate /wired for 220Volts / serial Number 5564 Super amp
U can come see it work of I can Meet up to 60 Miles from Madison Heights VA; Listing #1745782 - Submitted on 10/10/25 by Callsign K2BUR, Modified on 10/18/25 - IP: 172.59.117.147; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend