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 TUBES - Eimac 7580W / 4CX250R 
- Offering this from recent estate tube lot - cosmetics indicate either NOS or very, very low hours.
The 4CX250R/7580W is the heavy-duty, ruggedized version. Like the 4CX250B, it has 6.3v filament voltage. They ( “typically” ) deliver more output in most linear amplifiers which use the 4CX250B.
My TV-3B/U tube tester doesn’t cover this one, so it’s sold As-Is / No Return.
- Additional Pics on Request -
Reduced Price now: $ 36.00 Shipped (CONUS) from 92117 - 6x6x6 box - 1-2 lbs.
PayPal / USPS MO preferred - Check Accepted, but no ship until clears.
- Listing #1764099 - Submitted on 04/04/26 by Callsign W6SDW - IP: syn-076-175-204-014.res.spectrum.com
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 TOWER - FOR SALE Wilson MT-61B mast/tower
- WILSON crank up mast, 61-ft high, in excellent condition. Weighs 800 lbs, obviously not shippable. 21-ft in length cranked down. Unable to provide digital pictures, sorry, but can send prints if needed.... with manual.
$$1000.00
- Listing #1755111 - Submitted on 01/08/26 by Callsign K4ZA, Modified on 04/04/26 - IP: 99-76-155-254.lightspeed.chrlnc.sbcglobal.net
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- AMPHF - KPA500 RF Power Monitor
- KPA500 RF Power Monitor — Real-Time OLED Display for Elecraft KPA500
Six critical parameters, always visible, updating 10×/second on a high-contrast 256×64 OLED. No menu cycling. No squinting.
Monitors: Power Output (0–700W) · PA Voltage · PA Current · SWR · PA Temperature · Band + Operate/Standby
3×2 grid layout — large fonts sized for quick reading across the shack.
Direct RS-232 integration via MAX3232 — no amplifier modification required.
Specs: XIAO ESP32-C3 · SSD1322 256×64 OLED · 9–14.8V DC · 100mA · 10 Hz update rate · 4″ × 2″ × 4″
Free Bonus: Built-In WiFi — web interface mirrors the OLED with a retro green-on-black aesthetic, updated via WebSocket. Includes Power, Operate/Standby, Fan Speed, and Band controls plus OTA firmware updates. Access via kpa500.local — no app required. OLED operates independently of WiFi at all times.
Includes: Assembled & tested unit, DC power cable, RS-232 cable, quick start guide.
--$199 plus $10 shipping
- Listing #1763890 - Submitted on 04/02/26 by Callsign KV5J, Modified on 04/04/26, Web Site: http://www.kv5j.com - IP: customer.mmmiflx1.isp.starlink.com
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- TUBES - Raytheon RK-4D32 ( NOS )
Spares / Replacements for your vintage Collins 32V / Hallicrafters or Johnson Xmtrs ??
Have 2 in their factory sealed boxes - Will Ship “ Box-in-Box ”. AS-IS, No Returns…
( Unboxed tube is for reference Only... )
Price: $30.00 EACH Shipped ( CONUS ) from 92117
PayPal / USPS MO preferred - Check OK but no ship until cleared.
- Listing #1764098 - Submitted on 04/04/26 by Callsign W6SDW - IP: syn-076-175-204-014.res.spectrum.com
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- RADIOVHF - FOR SALE: Motorola ASTRO Spectra P25
- This Motorola ASTRO Spectra radio is programmed to
operate analog and P25 and is ready to use on the
following talkgroups:
10100 Worldwide; 10101 WW TAC 1; 10102 WW TAC 2;
10103 WW TAC 3; 10200 North America; 10201 NA TAC 1;
10202 NA TAC 2; 10203 NA TAC 3; 10300 Europe;
10301 EU TAC 1; 10400 Pacific; 302 Canada;
31672 Pi-Star Chat; 50525 Brandmeister Bridge;
10 Parrot; 9999 Unlink
$ 75 includes shipping
Payment via VENMO or USPS Money Order
- Listing #1764097 - Submitted on 04/04/26 by Callsign WA0TPN - IP: 199.101.219.150
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- RADIOHF - Elecraft P3 Panadapter for K3
- Elecraft P3 Panadapter for K3. It is in excellent condition with the cables to connect to the P3 and a power cable. I am asking $540 shipped.
- Listing #1764096 - Submitted on 04/04/26 by Callsign KA1API - IP: c-73-149-225-3.hsd1.nh.comcast.net
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- COMPUTER - Mac Pro computer one TB HD 64gb ram
- I hav a Mac Pro 2013 computer in nice shape. Has 1 the hard drive, 64 gb ram. Only thing not working is the headphone jack. I will include a blue tooth speaker. I run the Mac version of SmartSdr on my flex 8400M . It is running MacOS Sequoia I am asking $150 shipped
- Listing #1762841 - Submitted on 03/22/26 by Callsign KB4HL, Modified on 04/04/26 - IP: c-71-207-177-122.hsd1.al.comcast.net
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- COMPUTER - MAC BOOK AIR
- Mac Book Air works well nice shape asking $125 shipped.
- Listing #1761100 - Submitted on 03/06/26 by Callsign KB4HL, Modified on 04/04/26 - IP: c-71-207-177-122.hsd1.al.comcast.net
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- RADIOVHF - FOR SALE: Motorola GTX 900 MHz
- This Motorola GTX 900 MHz radio with microphone is
working and programmed to operate on the following
amateur frequencies:
927.0125 DPL023; 927.0625 tone 151.4; 927.1125 DPL432;
927.3375 minus w/ 131.5 tone; 927.3375 simplex;
927.5 tone 114.8; 927.5 151.4 tone; 927.5 100.0 tone;
927.6 simplex; 927.825 151.4 tone
$75 includes shipping
Payment via VENMO or USPS Money Order
- Listing #1764095 - Submitted on 04/04/26 by Callsign WA0TPN - IP: 57-89-181-166.mobile.uscc.net
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- ANTHF - EAntenna 10 Thru 40 meter Delta.Loop
- I have a new in the box EAntenna Delta loop I am asking $300 and you pick it up at my home in Killen Alabama. it will cover 10 thru 30 meters and also 40 meters with an external Antenna tuner. If you go to DXeng you can view the antenna specifications .
- Listing #1761052 - Submitted on 03/06/26 by Callsign KB4HL, Modified on 04/04/26 - IP: c-71-207-177-122.hsd1.al.comcast.net
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