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Modifications & More

DFD2  Digital frequency readout kit for Collins S line, FT101, Heathkit SB301 and TS520

Globe Scout 680 - Simple Audio Modification
Harbach Electronics Product Instruction Sheets
Swan MK6B Manual
T-368 Audio Modifications

Collins 30L-1 Manual
Collins 30S-1 Manual
Collins 32V-3 - Modified Speech Amp/Driver  by WA1HLR
Collins 75S-1 CW Filter Installation  .pdf file
Collins Amateur Service Agency Bulletins
Collins Parts  Harbach electronics
Collins R-390A 32V AC Wiring Danger  by Chuck, WA4HHG
Collins R-390A Audio Modifications  by Chuck, WA4HHG
Collins Radio Equipment Manuals
Collins Service Bulletins and Service Information Letters
Souping Up the 75A-4  .pdf file

Drake Manuals and Schematics  WB4HFN
Drake Parts  Harbach electronics
Sherwood / Drake R-4C

Johnson Ranger Modifications
Johnson Ranger - Simple Audio Modification
Johnson Viking I and II - Audio Conversion
Johnson Viking I and II - Audio Conversion  by Ed, KS3K

Hallicrafters BC-610

Hammarlund SP-600 Audio Modifications  by Chuck, WA4HHG

Heath Schematics at Bama
Heathkit "Cross Reference"  Cross Ref List of Heathkit p/n's to Indusrty Std
Heathkit DX-60 Audio Mods  by Bob, K4TAX
Heathkit DX-60 Audio Mods  by Bill, WC3K
Heathkit DX-60 - Modified Speech Audio  by KS3K
Heathkit DX-100 - Audio Modifications
Heathkit DX-100 - Low Cost Drive Pot Replacement  by Norm, WB2SYQ
Heathkit DX-100 - Screen Modulation Optimization
Heathkit HA 10 Warrior Amplifier diagram
Heathkit Manuals
Heathkit Mod SBM-102-1
Heathkit Parts Available
Heathkit Product Matrix  Service Bulletins, Equip list by p/n with photos etc
Modified HF kW Amplifers for 6m  Conversions for SB200, 220, 230, 1000 & other brands
QSK for the TL-922 & SB-220 With Circuit Improvements for the TL-922
Replacement Parts
RIT Mods for the HW-101  PDF file
SB-101 Rebuild and Restoration Notes  W2PA
SB-200 Amplifier Restoration and Modification
SB-200 Keying Modification  Schematic
SB-200 Parts  Harbach electronics
SB-200 Resources  Restoration, upgrading, parts, etc
SB-200 Standby Mod  by N4NRW
SB-220 - Adding 160 Metre Coverage
SB-220 Amplifier Circuit Improvements
SB-220 Parts  Harbach electronics
SB-220 - Putting The Amplifier On 6M  PDF file
SS-101 Wiring Diagrams  Harbach electronics  PDF file
The Heathkit Shop  Nice collection of Heathkit Ham gear
Welcome to Heathkit

IC-706 Extended RX Mod
IC-706 Extended TX Mod
IC-706 Extended TX (1.6-54MHz) + The Yellow Wire RX Mod
Receiver Modifications for the IC-706  receive 300 Khz to 185 Mhz
IC-746 Mods
IC-775 Mods
Simple ICOM CAT Interface  by OK2WY

TM-D700A Mods
TM-D700A Software

FT-51-800 Mod
FT-100 Resource Page  by WM7D
FT-101 - Audio Modifications  by Bob, N1UJS
FT-101 HF Transceiver Home Page  History, mods, specs, & more, by NW2M
FT-920 Resource Page  by WM7D
FT1000MP Display Problem  by VE3iVM
FT-1000MP Page  Dedicated to the FT-1000MP enthusiatist, by VA3CR

RS232/TTL Interface Schematic  To control a rig - by Jon, KE9NA
Tech Info  for homebrewing, modifications, repairs, AM theory, and lots of schematics