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National Service Notes Service Notes for the National receivers: NC-33, NC-46, NC-57, NC-108, NC-1-10, NC-173, NC-183, NC-200,NC-2-40D, HRO-5A1, HRO-7, HFS, 686S, 1286S, NC-TV-7, NC-TV-10 and NC-TV-10-12.
Compliments of Lloyd Godsey, KK7IZ.
1-10 Manual for National 1-10 uhf receiver.   Compliments of Jim Clifford, KE4DSP.
ACN Scan of the paperdial plate for the National ACN Dial. If printed on thin card stock will make a great reproduction.  Compliments of Jeff Harshman, N2LXM.
AGS Manual for the National AGS receiver.  Compliments of Al Parker, W8UT.  (See FB-7 below for coil winding data)
AR-7 Manual and photograph of the R. A. A. F. version of the HRO.  Compliments of Andy Gluis, VK5AAQ.
AR-7 Circuit diagram for the Australian AR.7 receiver, a pre war copy of the HRO.  Compliments of Rodney Bunt, VK2KTZ
AR-7 Cleaned up version of the Australian AR-7 (National HRO clone) schematic. Compliments of an unknown contributor.
FB-7 Materials.  Compliments of Jim Clifford, KE4DSP.
FB-7 Coil winding data for the National AGS and FB series receivers (FB-7, FB-X).  Compliments of Joe Cro, N3IBX.
HFS Manual.  Compliments of Jim Roik, VE4AQ and Alan Bird.
HRO British Army Electrical and Mechanical Engineering Regulations for the R.106 Mks 1 and 2 (National HRO). The original HRO (Senior, M, MX etc) although obsolete in the US by 1939 was refurbished and shipped to the UK in large numbers and used for monitoring and direction finding well into the 1950s.   Compliments of Ron Brown, GW6WRP.
HRO Booklet:  Instructions for the HRO Series of Radio Receiving Equipments Including HRO, HRO-5, HRO-5R, HRO-M, HRO-MX, HRO-M-RR, HRO-M-TM, HRO-SR, HRO-JR.  Compliments of Ed Lambert, K1ZOK.
HRO Original HRO circuit diagram.   Compliments of John Gibson.
HRO Manual for the National Power Units, Types 686, 697 and 1286 (typically for the early HRO receivers - see also pages 23 & 24 of the HRO-7 manual as this gives component values and schematics for the 686S and 697 units.
Compliments of Ron, gw6wrp.
HRO 1935 Booklet.  Compliments of Dave Hollander, N7RK.
HRO-5 Schematic.  Compliments of Larry Ware.
HRO-5A1 Schematic.  Compliments of Larry Ware.
HRO-5A1 Partial manual.  Compliments of Ron Martinmaki, W9EOA.
HRO-5 Supplemental materials.   Compliments of Jim Roik, VE4AQ.
HRO-5 Powerpoint files for HRO 5 coil pack dials that can be edited to make other ranges. When printed on a laser jet they look good as new.  Compliments of Alan Richard.
HRO-50 Manual for HRO-50.  A composite of the incomplete manual that is available elsewhere on the web with the missing pages supplied by
Bob Lawson, W4RL. The schematic has been redone and is now usable. Several other pages have been re-scanned and added to the folder. The original scans were brought to my attention by Christian Javier Pedernera, LW2DXX. 
HRO-50 Sam's Folder for the National HRO-50 receiver.  Compliments of Glen Zook, K9STH.
HRO-50-1 Manual for the National HRO-50-1 receiver.  Compliments of Bruce Bonham, KB0PGO.
HRO-60 Manual for HRO-60.  Compliments of Brian Waldron, WB8JEA.
HRO-7 Manual for National HRO-7 receiver.   Compliments of Richard M. McClung.
HRO-7 Schematic.  Compliments of Larry Ware.
HRO-7 Sam's Folder for the National HRO-7 receiver.  Compliments of Glen Zook, K9STH.
HRO-M Schematic.  Compliments of Larry Ware.
HRO-500 Manual for the National Model HRO-500 receiver. Schematics in 2nd pdf.  Compliments of Larry Saletzki, WA9VRH.
KST Schematic, photo, and tube data for HRO Sr. copied by Germany before and during World War II.  Compliments of Jan Martin Noeding, LA8AK.
MB-150 Application Notes for National MB 150 Multi-band Tank from Sheldon Wheaton, KC0CW.
NC-33 Owners Manual for the NC-33 receiver.   Compliments of Niel Wiegand, WA5VLZ.
NC-44 Schematic.  Compliments of Larry Ware.
NC-44 Manual for NC-44.  Compliments of Dave Hollander, N7RK.
NC-45 Schematic.  Compliments of Larry Ware.
NC-46 Schematic.  Compliments of Larry Ware.
NC-46 Manual from Norm Hall, W6JOD and Mark Shoup.  Dial restringing guide added.
NC-57 Owners manual Compliments of Bill Sorsby, N5BU.  Schematic,  compliments of Larry Ware.
NC-57 Sam's Photofact for National NC-57 receiver.  Compliments of Richard Heindel, WB8KRN .
NC-57B Owners manual for NC-57B.   Compliments of Mark Shoup.
NC-57M Owners manual for NC-57M.   Compliments of Mark Shoup.
NC-60 Manual for National NC-60 receiver.  Compliments of an unknown contributor.
NC-66 Manual for the National NC-66 receiver.  Compliments of Bill Hulls.
NC-66 Schematic diagram of National NC-66 receiver.  Compliments of Terry Lyon, KA3GCQ.
NC-200 Owners manual for NC-200.     Compliments of Mark Shoup. 
NC-80 Partial manual for NC-80.   Compliments of Ron Martinmaki, W9EOA.
NC-88 Manual for National NC-88 receiver.  Compliments of Doug Hall, KD4EM.
NC-98 Operation manual and service information for National NC-98 receiver.
Compliments of Tony Stalls, K4KYO.
NC-100 Manual for National NC-100 receiver (1936 version with 6E5 "tuning eye").  Compliments of Mike Manship, W9OJ.
NC-100 series Dial Restringing guide for the National NC-100 family of receivers.  Compliments of William Fizette, W2DGB and Stanley Adams, W4SBA.
NC-100
NC-101X
Manual for NC-100 and NC-101X.   Compliments of Dave Hollander, N7RK.
NC-100ASD Manual for NC-100ASD.   Compliments of Andy Gluis, VK5AAQ.
NC-108 Schematic.  Compliments of Larry Ware.
NC-109 Manual for NC-109.  Compliments of Mark Shoup.
NC-125 Manual for NC-125.  Compliments of Mark Shoup.
NC-140 Manual for the National NC-140 receiver.   Compliments of Bill Kleinschmidt, N9FDE.
NC-155 Manual for National NC-155 receiver.   Compliments of Glen Zook, K9STH.
NC-173 Owners manual for NC-173 receiver.   Compliments of Dave Hollander, N7RK.
Second copy with NBFM adapter covered, compliments of Richard Knoppow.
NC-183 Owners manual for NC-183 receiver.   Compliments of Dick Blaney, WB8MHE.
NC-183 Schematic.  Compliments of Larry Ware.
NC-183D Owners manual for NC-183D.   Compliments of Tom Dover, WD4FFN.
NC-183D FSN-42 Service Note FSN-42 for National NC-183D communications receiver concerning drift reduction.  Compliments of an unknown contributor.
NC-188 Owners manual for NC-188 receiver.   Compliments of Walt Szachara, W2OKF.
NC-190 Owners manual for NC-190 receiver.   Compliments of Scott McDonald, KA9P.
NC-240D Owners Manual for NC-2-40D receiver.   Compliments of Tom Dover, WD4FFN.
NC-240D Sams Photofact for the National NC-2-40DT and NC-2-40DR.
Compliments of Glen Zook, K9STH.
NC-240CS Owners Manual for NC-2-40CS receiver.   Compliments of Norm Hall, W6JOD.
NC-270 National NC-270 manual.   Compliments of James Lueck, W5LWU.
NC-300 Owners manual for NC-300 receiver.   Compliments of Peter Wokoun, KH6GRT.
NC-300CONV Owners manual for NC-300 vhf converters.   Compliments of Larry Johnson, K7LJ.
NC-300 FSN Factory service notes for the National NC-300 receiver.  Compliments of Garey Barrell, K4OAH.
NC-303 Owners manual for NC-303 receiver.   Compliments of Larry Johnson, K7LJ.
NC-400 Owners manual for NC-400 receiver.   Compliments of Bruce Brackin.
NCL-2000 Manual for the National NCL-2000 Amplifier complete with RCA 8122 Tube Data.  Compliments of Walt Szachara, W2OKF.
NCX-3 Manual for the National NCX-3 transceiver and NCX-A power supplies.  Compliments of Lynn Bisha.
NCX-3 High Resolution Schematic for the National NCX-3 transceiver.  Compliments of Larry Saletzki, WA9VRH.
NCX-A and NCX-D Manual for the National Model NCX-A and NCX-D Accessory Power Supplies for the NCX-3.  Compliments of Larry Saletzki, WA9VRH.
NCX-5 Operating manual for NCX-5 transceiver.  Compliments of Mike Sullivan, KC2KJ.
NCX-5 Manual for the National Model NCX-5 transceiver. Schematics in 2nd pdf.  Compliments of Larry Saletzki, WA9VRH.
NCX-5 Customer Service Bulletin CSB 66-1 for NCX-5. Compliments of Gregory Mijal, WA7LYO.
NCX-200 Manual for National NCX-200 Transceiver and AC-200 Power Supply.
Compliments of Rod Hersh, WA1TAC.
NCX-500

Manual for National NCX-500 transceiver.  Compliments of Alan Richard.

PW Illustrated documentation for taking apart and reassembling National PW dial.  Compliments of Rich Debusschere, W8DOW.
PW-DIAL Instructions for mounting the PW Condenser.  Compliments of Larry Ware.
RAO-2 Manual for National RAO-2.   Compliments of Bob Kulow WA2UEH.
RAS-2 Manual for National RAS-2 receiver.   Compliments of Dave Hooker, WB4KVZ. 
RBH-1

Manual for National RBH-1.  Compliments of Bob Kulow WA2UEH.

RBL-5 Manual for the National RBL-5 LF receiver (15 kc/s to 600 kc/s) for the US Navy.  Compliments of an unknown contributor.
RDF-66 Manual for RDF-66 Radio Direction Finder.  Compliments of Mark Shoup. 
Select-O-Ject Manual for Select-O-Ject.    Compliments of Jim Roik, VE4AQ.
SW-3 Universal SW-3 manual.   Compliments of Steve Johnston, WD8DAS.
SW-3 National DC SW-3 schematic.  Compliments of Bob Mattson, W2AMI.
SW-3 Coil winding data for the National SW-3 "60 Series" receivers. Even though the data is for the 60 series coils, it should work with the other two variants. On page #4 there is a diagram of the 6 pin coil form.  Compliments of Joe Cro, N3IBX.
SW-54 Manual for National SW-54.  Compliments of Delson Meira, PY2DME and Garey Barrell, K4OAH.
SW-54 Sams Photofact for the National SW-54 receiver.
Compliments of Tom Bavis.
VFO-62 Manual, service bulletin and mods for National VFO-62.  Compliments of Bob Cole, W4RLC.
XCU-27 Manual for the National XCU-27 Universal Crystal Calibrator.  Compliments of Lynn Bisha.
XCU-303 Schematic and instructions for Crystal Calibrator.  Compliments of Ron Martinmaki, W9EOA.