QTH.COM Ham Radio Classified Ads: MISC - Swap amateur radio HF VHF equipment buy sell trade on line

For Trade: Carleton O₂ Solenoid Valves: Pair of Carleton Technologies / Treadwell Corp Oxygen-Service Solenoid Valves
P/N 04577/3521-0001-3 — Matching Units — Seller Refurbished
This listing is for a matched pair of Carleton Technologies oxygen-service solenoid valves with Treadwell-manufactured bodies. Both valves share the same model number (04577/3521-0001-3) and are rated for 3000 PSIG oxygen service. Each unit is powered by 105 VDC and draws 22 W peak / 8 W average. Perfect for aerospace repair, oxygen delivery systems, high-pressure pneumatic control, research applications, or aviation surplus collectors.
Both units were professionally refurbished under U.S. Navy contract **N00104-10-G-A002**, and each carries a clearly readable refurbishment date (01/13 and 07/14). Bodies, ports, fittings, and nameplates are in excellent condition with tight threads, clean surfaces, and intact electrical connectors. No corrosion, leaks, or mechanical damage.
These valves are extremely hard to find on the secondary market, especiall; Listing #1751271 - Submitted on 11/30/25 by Callsign 6155880659 - IP: syn-071-088-209-076.res.spectrum.com; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
For Trade: Carleton T40 Solenoid Valve: Carleton Technologies Solenoid Valve, S/N T40. Oxygen/Distilled Water service, rated 3000 PSIG. 105 VDC, 22W peak / 8W avg. Clean unit, excellent condition with clear tag. Refurbished under U.S. Navy Contract N00104-10-G-A002 (Date: 08/14). Includes OEM Treadwell manifold block with FLOW direction markings.
Looking to TRADE for directly ham-related gear only (QTH rules). Radios, tuners, test equipment, or other useful ham items considered. No commercial sale here — trade only.
Can send more pics if needed. Solid unit, ready for serious use.; Listing #1751270 - Submitted on 11/30/25 by Callsign 6155880659 - IP: syn-071-088-209-076.res.spectrum.com; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
2 TURNER MIC: antique Turner x80 mic crystal mic with base fairly rare 65.00 shipped
tuner has sold; Listing #1749825 - Submitted on 11/17/25 by Callsign KE5FAQ, Modified on 11/30/25 - IP: 146.12.250.247; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Want to Buy - Autek WM-1 Comp Wattmeter: Want to buy non-working, broken or questionable Autek WM-1 Computing Wattmeter's. But not broke as bad as the one in the picture! I am a glutton for punishment and like to try to revive these outdated meters. Most any offer will be considered. This ad is NOT for functional meters unless you just want to get rid of one cheap!
Jim - K5JTH; Listing #1751219 - Submitted on 11/30/25 by Callsign K5JTH - IP: 172.59.194.54; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
Icom SM-20 Desk Microphone: Excellent condition in the Icom box
$135 shipped/Insured & double boxed; Listing #1749107 - Submitted on 11/10/25 by Callsign KL7AM, Modified on 11/30/25, Web Site: https://kl7am.com - IP: 30-109-35-72.mtaonline.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
MFJ 407B KEYER: This MFJ 407B Keyer is in good opperational and cosmetic condition. Runs on external power supply or internal 9 volt battery, neither of which are included. Price is $55.00 shipped, payment by PayPal. Reply by QTH.com only, private email will be ignored. No returns or refunds because of bad people.; Listing #1751209 - Submitted on 11/30/25 by Callsign WD4ERM - IP: 50.215.208.225; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
ICOM SM 2 MIC 8 PIN: It is in good working order. There maybe some small cosmetic scratches due to age.It is the 8 pin version. Can be used with ICOM 735, 781, 761, 271h, 471h and more. No returns. Sold to CONUSA only.Local Tilton, NH pickup possible. $145.00 shipped and insured. PayPal AK1NH; Listing #1751202 - Submitted on 11/30/25 by Callsign AK1NH - IP: c-73-227-15-155.hsd1.nh.comcast.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend
FILTERS 455 & 500 KHz & 10.7 & 21.4 MHz: These filters are used (solder on many terminals). They have all been tested and work correctly.
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PRICES INCLUDE SHIPPING in the USA.
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DON'T LIKE MY PRICES? - - MAKE AN OFFER - - MAKE AN OFFER!
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KOKUSAI ELECTRIC MECHANICAL FILTER
MF-455ZL-21H (2 available) - $30 each (both for $55)
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RCA
3460514-7 - C.F 455 KHz, B.W. 12 KHz, wire leads in & out - $12
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Network Int'l, CF 8.56 MHz, BW 400 Hz
Cirtech Corp, CF 10.7 MHz, BW 2 KHz - $40
TYCO Filters, CF 10.7 MHz, BW 8 KHz - $40
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21.4 MHz Center Frequency - $40 each
Networks Int'l Corp
- A-148, BW 3 KHz
- A-148, BW 6.4 KHz (2 available)
- A-748, BW 10 KHz (3 available); Listing #1746092 - Submitted on 10/13/25 by Callsign K3DUA, Modified on 11/30/25 - IP: pool-108-50-43-148.bltmmd.fios.verizon.net; Click to Contact -- Send this Ad to a Friend
KENWOOD, TRIO, YAESU, DRAKE FILTERS: MAKE AN OFFER - - MAKE AN OFFER.
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These filters are used (solder on some terminals). They have all been tested and work correctly.
Prices include shipping in the USA.
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KENWOOD FILTERS
YK-88S - $60
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INTERNATIONAL RADIO FILTERS
YF33H18, 3395 Khz - - $50
YF-88HCW - - $50
IR-88H1.8BC - $50
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YAESU FILTER
XF-8.2M-272 - $40
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DRAKE FILTER
C-F Networks model 5.64-2.4L - $60; Listing #1736631 - Submitted on 07/19/25 by Callsign K3DUA, Modified on 11/30/25 - IP: pool-108-50-43-148.bltmmd.fios.verizon.net; Click to Contact -- Send this Ad to a Friend
For Sale EF Johnson brass J-38 cw key: From SK estate. EF Johnson brass J-38 cw key. has numbers 069 on underside. Asking $70 plus shipping.; Listing #1751161 - Submitted on 11/29/25 by Callsign KE8WSM - IP: static-50-54-108-178.nrwl.oh.frontiernet.net; Click to Contact -- Click Here to View Picture -- Send this Ad to a Friend