General Technical Info
Three Diode Negative Peak Limiter
The Aircheck Tape - An Audio QSL & Reception Report by Paul Courson, WA3VJB.
Mic Amp by Bill, N2WXJ
70E8 PTO - How to Renew the Dessicant Pack by Paul Courson, WA3VJB.
IERC Tube Shields for the R-390A by Chuck Rippel, WA4HHG.
The Seven Deadly Caps - 75A-4 Repair and Restoration Tips by Chuck Rippel, WA4HHG
A Quick and Not So Dirty Path To High Fidelity Audio by Steve, WB3HUZ
The R-390A Owners Manual by Chuck Rippel, WA4HHG (Text version- use if you want to print it out.)
A Zener Diode Negative Peak Limiter by Steve, WB3HUZ
An Amazing Transformation (How to make a Mod Transformer from a TV Power Transformer) by Tim Smith, WA1HLR
Simple Antennas for Ten Meters by Steve, WB3HUZ
Oscilloscope Modulation Percentage Measurements Working Aid
An NE602 Balanced Modulator
813 Transmitter Schematic - this is the famous (or infamous) ZEQ/JJ rig.
Two-element Yagi for 10 Meters by Tom, K1JJ
Another Low Distortion Detector by Rob, K2CU
Centralab Couplate Info TNX to John, WB5OAU
Grounding for Amateur Radio Stations by Bob, K4TAX
An Improved Three Diode Negative Peak Limiter by Steve, WA1QIX
Improved Ionospheric Propagation With Polarization Diversity, Using A Dual Feedpoint Cubical Quad Loop by George, AB2KC
Lightning Protection by Bob, K4TAX
Johnny Novice's Guide to Receivers by John, W3JN
Series Modulated 807 by Bob, WB9ECK
The Slab Bacon's "Receiver Road Test" by Frank, KB3AHE
A Modulator for Rice Boxes by Bob, K1VUB (details for Ten Tec Paragon)
Getting on 160 Meters - Without a Full-Sized Antenna by Steve, WB3HUZ
Enhanced AM by George, W2WLR (tnx K4KYV)
Johnson Navigator Meter Face Graphics tnx to W2FAL
Specification Sheet for 4-1000 Triode Connected Grounded-Grid Service
Tube Limter from 1957 Radio & Television News, tnx to WQ9E
Anode Materials from 1935. Good info on the plates in our transmitting tubes. Tnx to K5PRO.
HT-32 Restoration by Ken, K6FC
Ranger Restoration by Ken, K6FC
Taylor Super Modulation from 1948 Radio & Television News, tnx to WQ9E: Part 1 and Part 2
National MB-40SL Mult-Band Tank Manual tnx to W2ICQ
Performance of Short Antennas - (verticals) from the IRE in 1947, tnx to K5PRO
Solid State HV Rectifiers - design criteria from the IRE Transactions on Broadcasting, Vol BC-7, 1961, tnx to K5PRO
Notes on Restoring a National NC-300 by Ken, K6FC