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 RADIOHF - FS: 275V regulator 4 516F-2 and PM-2 PS 
- Due to old 1956 design of 516F-2, or PM-2 power supply for Collins KWM-2 (A) or 32S series transmitters runs on 125V AC power Voltage, the 516F-2 supply should deliver 275V Low Volt becomes 330V Plus minus during receive mode of KWM-2(A), vacuum tubes get 330V which will shorten life of tubes and cause extreme hot temperatures affect other parts. KWM-2(A)and 32S series transmitter get lot of heat problems. I have a solution to keep the LV to exactly 275V either transmit or receive mode.Using 500V MOSFET and series of Zener regulators,LV is now tightly regulated which helps keep the VFO with no drift and no audio hum as it works as ripple filter.The board is 22mm x 30 mm by size, made with SMD components and can be fit to the sidewall of power supply. Price is $40 plus $6 for USPS. two or more it has to be shipped by priority, price is $13.check to my QRZ.com address.Other output V,150V or 250V or 300V if
- Listing #1762591 - Submitted on 03/20/26 by Callsign K6HM, Modified on 05/13/26 - IP: 75-37-192-218.lightspeed.lsatca.sbcglobal.net
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 BOOKMAG - Wanted: Collins KWM-2 Manual
- Looking for a Collins KWM-2 manual; 1962 version with a blue cover.
- Listing #1767903 - Submitted on 05/12/26 by Callsign WB0F - IP: 172.58.9.69
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- ANNOUNCE - Scammers
- I listed a WTB add for a Collins filter.
What I got back were several offers OUTSIDE of QTH trying to sell me the filter that I was looking for. All of the sellers have the SAME email format which is first/last/call sign at gmail.com. QRZ does not have an email listed for the call sign they are using.
When I ask for conversations be through the QTH mail system they ask why and refuse.
They want payment only through electronic methods such as PayPal.
They refuse Postal Money Order. I ask to send payment to a US mail address and they refuse. I ask for a telephone number and they say they don't have one.
I did contact two of the hams who's call signs were being used and they both said they did NOT send me an email offer.
So the short warning is make sure that you can veriry the person before you send money.
Beware!
- Listing #1767851 - Submitted on 05/12/26 by Callsign K1WPO - IP: syn-174-083-057-096.res.spectrum.com
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- RADIOHF - FOR SALE: AOR DDS-2A VFO
- Offered for sale is an AOR DDS-2A external VFO, designed for use with Collins S-Line gear. The DDS-2A is a microprocessor-controlled VFO which uses DDS/PLL circuitry to replace the PTO and HFO in the original Collins equipment, giving much greater stability and 10 Hz frequency resolution. AOR specs state both inter-mod and cross-mod performance is also improved. The DDS-2A units seldom show up for sale; this one was connected to my 75S-3B to confirm proper operation and functioning with the custom cables. Included will be the VFO unit itself, the cable set, and copy of the manual. Buyer will need to furnish a 12 volt supply, with minimum of 1 amp capability. Overall physical condition of the unit is very good, with only a few minor marks on the top cover. $1250 with free shipping; payment requested via Zelle, Paypal, or cashier’s check.
- Listing #1767834 - Submitted on 05/12/26 by Callsign N3CW, Web Site: https://www.qsl.net/n3cw/index.html - IP: cpe-64-203-128-78.lyn.hsw.ntelos.net
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- RADIOHF - Hamvention Items 8313-8316
- Taking these items to Hamvention
Collins 75S-3B Restoration by WA8SAJ
Drake TR-5 W/Supply Nice Condition Works Great Except 20M (Suspect Crystal)
Drake TR-4CW
Drake R-7
Drake TR-7A
Drake L-7
Drake W-7 Meter
Rare Cubic Astro 103 (30 Meter PLL Synch Issue)
Heathkit HW-101 Station w/digital readout
Hammarland HQ-100 w/digital readout Restoration by WA8SAJ
JRC 525
Icom IC-71A
Ten Tec Hercules II With Luke H.D.80 Constant 100 Amp Surge Supply
Heathkit 6 meter MonoBand Conversion (Rough But Works)
Millen 92200 Antenna Tuner Heavy Duty & EXCELLENT!
Antennas HF & VHF New In Box
Gulf Alpha 7 element Dual Polarity 2 meter Yagi (New in Box)
E Antenna 2 element 6 meter Yagi (New In Box)
Mosley A-505S 6 meter 5 element Yagi (New in Box)
Zero Five Colossal !0/11 5/8 (New In Box)
Zero Five 33 ft 40 Meter 1/4 wave (Used for few field days Excellent)
Yaesu FT-101ZD/FT-901/FT-902 FV-901 Power Cables AC & DC Versions
Plus More See at Hamvention 8313-8316
- Listing #1767704 - Submitted on 05/10/26 by Callsign K8ATF, Modified on 05/11/26 - IP: dynamic-acs-24-101-0-144.zoominternet.net
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- MISC - KENWOOD ICOM COLLINS & DRAKE ETC 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
YG-455C-1 with mounting screws - - $85
YG-455CN-1 - - $85
YK-88C-1 - - $80
YK-88A-1 with mounting screws - - $90
pc board (X48-3110-00) from a TS-50S with one stock SSB filter and room for an optional CW filter - $50
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ICOM FILTERS
FL-32A - - $65
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DRAKE FILTERS
SL-500 - - $85
C-F Networks model 5.64-2.4L - $60
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INTERNATIONAL RADIO FILTERS (INRAD)
#99 455.7 kHz, 400 Hz - - $80
#760 - 9000.75 kHz, 250 Hz, on pc board - - $90
YF33H18, 3395 Khz - - $50
YF-88HCW - - $50
IR-88H1.8BC - $50
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COLLINS FILTERS
F455FA21 6411 (526 9427 00) - - $75
F455Z4 1V2 (265 9364 00) - - $75
- Listing #1767098 - Submitted on 05/05/26 by Callsign K3DUA, Modified on 05/11/26 - IP: pool-173-69-135-23.bltmmd.fios.verizon.net
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- RADIOANQ - COLLINS
- NICE A LINE SPEAKER SC101 CANADIAN BUILT
ASKING $ 750 BUYER PAYS SHIPPING
- Listing #1767359 - Submitted on 05/07/26 by Callsign WF1U - IP: ip68-14-74-182.ri.ri.cox.net
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- BOOKMAG - F/S COLLINS MANUALS - REDUCED $$
- NOW, BUY 2 OR MORE AND TAKE 20% OFF THE SUM OF THE INDIVIDUAL PRICES.
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All are original, unless noted otherwise
3-hole punched - - marked "3HP."
Prices include mailing in the USA
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MANUALS & INSTRUCTIONS
51J4, Receiver, COPY - $12
75A-2, Excellent COPY, GBC bound - $15
75A-2, COPY, Photofact - $10
75S-3 & 75S-3A, RCVR, COPY, - $12
32V XMTR, back cover loose, schematic in pieces - $15
32V-1, COPY, XMTR - $15
136B-2, 3HP, Noise Blanker - $15
312B-4,3HP, Station Console - $15
312B-4 COPY, Station Console - $10
351-2, Mobile Mount - $10
516E-2, 3HP, 28-Volt Pwr Supply - $10
516F-2, COPY, AC Pwr Supply - $10
MP-1, COPY, Mobile PS - $10
PM-2, COPY, Power Supply - 10
TM 11-5820-530-15 Control, Radio (Collins Models 312B-4 & 312B-5) - $15
- Listing #1761754 - Submitted on 03/12/26 by Callsign K3DUA, Modified on 05/07/26 - IP: pool-173-69-135-23.bltmmd.fios.verizon.net
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- BOOKMAG - F/S COLLINS LITERATURE - PART 1
- NOW BUY 2 OR MORE AND TAKE 20% OFF THE SUM OF THE INDIVIDUAL PRICES.
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All are original.
3-hole punched - - marked "3HP."
Prices include mailing in the USA
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LOG BOOKS - S-line station on cover - $20
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SALES FLYER
32V-1, 4 pages - $10
HF Antennas
- 237C-( ), 4 pgs - $10
- 237D-( ), 4 pgs - $10
- 237E-1 and 237E-2, 4 pgs - $10
- 237F-1, 1 sheet, $7
- 237-H ( ), 4 pgs - $10
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CATALOGS
1963-64, sketch of S-line station on cover (32 pgs, 3HP) - $20
No. 32, S-Line Station in desk console on cover (24 pgs, 3HP) - $20
No. 33, S-Line Station in desk console on cover (24 pgs, 3HP) - $20
Gray cover with KWM-2 (16 pgs) - $20
Red cover with KWM-2A - $20
Amateur Radio Equipment Price Schedule, 1 May 1969, 16 pgs - $20
Set of 2 , 20 page each catalogs. "VHF Transhorization Communication Equipment" and "UHF Transhorization Communication Equipment." - $30
Surface Acoustic Wave Devices (3 items - total of 15 pgs, 3HP) - $15
- Listing #1767328 - Submitted on 05/07/26 by Callsign K3DUA - IP: pool-173-69-135-23.bltmmd.fios.verizon.net
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- BOOKMAG - F/S COLLINS LITERATURE - PART 2
- NOW BUY 2 OR MORE AND TAKE 20% OFF THE SUM OF THE INDIVIDUAL PRICES.
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All are original.
3-hole punched - marked "3HP."
Prices include mailing in the USA
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NEWSLETTERS
PULSE - 11/73, Announcing the Collins-Rockwell merger - $15
SIGNAL - #28, #36, #38, #44 - $10 each
Collins Collector's Monthly Magazined - $10 ea or $40 for 6
vol 2 #8, #9, #10, #11, #12, #13
Collins Collector's Quarterly Magazine - $10 ea or $60 for 10
vol 1 #3,
vol2 #1, #4, #5&6, #7, #8, #9, #11, #12, #13
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OTHER
"Collins Developments in HF SSB" small booklet- - 3/57 - $15
Dealer list (pre ZIP codes), 3HP - $10
Development Description, 490T-1 Antenna Coupler, 12 pages - $15
THE COLLINS GUIDEBOOK AND NOTES, by THE COLLINS JOURNAL, 1994 - $15
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MECHANICAL FILTERS
General Catalog - 12 pgs, 3HP
- 6/54 - $12
- 4.68 - $15
F250A, Z Series, 3HP - $7
F455-E, F, H, J, K, Z Series, 4 pgs, 3HP - $8
F455FA-27, 3HP - $7
F455FA-120, 3HP - $7
F455FC-60, 3HP - $7
F455Y-330, 3HP - $7
F455A-16 (USB), 3HP - $7
F455Z-17 (LSB), 3HP - $7
- Listing #1767327 - Submitted on 05/07/26 by Callsign K3DUA - IP: pool-173-69-135-23.bltmmd.fios.verizon.net
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