Previous Projects

• ETI Bench Amp
• Beginners Shortwave Receiver
• Practical Wireless Direct Conversion Receiver
• Practical Wireless Sudden Receiver
• Practical Wireless Meon 6m transverter
• ARRL / Rochester VHF Group Receive Converter
• Marker Generator
• 2m Class C (FM) Amplifier
• I built a 7216-based frequency counter from some magazine but that was stolen from the back of the Rand-Lover while loading it, so no pics.
• Replacement display for FT-290R
• Norcal Balanced Line Tuner

Current Projects

• Tandem Match
• Antenna Analyser

Future Projects

• SM0VPO Grid Dip Oscillator
• Precision Power Supply
• 6m Linear Amplifier
• PIC based CW Decoder
• PIC based Iambic Keyer
• Restoring a Bulova 140 Clock Radio and converting it to 220V / 50Hz
• Back in 1997 ZS1PL and I bought the PCBs and matched components for the R2 receiver and T2 transmitter from Bill Kelsey N8ET. Still havn't built them.
• Radio Handbook for Amateurs and Experimenters 3-Tube Superhet based on the 1936 Frank C. Jones design.
• A vacuum tube transmitter that covers four bands using two tubes
• Convert a BC-221 to a regen
• KB7NRN Hiker's Two maybe with a 6AU6.

pinterest

• AA7EE's Sproutie general coverage regen.
• W7EKB Regenerative Receivers, 12AT7 160m - 15m regen and Meissner Midget receivers.
• Beginner's Short Wave Two using an acorn to get to 100 MHz.
• pwdrive's Regenerodyne receiver.
• Skywave's all-semiconductor regulated HT PSU.
• Dave's Regen-o-Flex.
• Bob's Electron Bunker and One tube double reflex superhet.
• Cyclops
• Two valve receiver from Practical Wireless, August 1950, which uses a Lisson Hyperium interstage transformer.
• Tom Thumb transceiver from QST, September 1945
• The Minima is a general coverage HF transceiver using an Arduino and a Si570 DDS. Ashhar Farhan VU2ESE's page, Wiki, 0-21 MHz version, YO4HPP's blog with PCBs.
• "Five by Twenty" 5 tube SSB QRP Transceiver for 20m (5 MHz IF, VXO using CB crystals).
• "Twinplex" 6SN7 regen receiver by AA8V
• Band Imaging Receivers
• A Mate for the Mighty Midget, Lew McCoy, QST April 1966. An 80 and 40m superhet with 3 x 6U8 and a two-crystal filter.
• "6x2" Superhet by AA8V. Same idea as the Mate for the Mighty Midget but minus the RF amp, plus a crystal calibrator and an extra audio stage.
• McMurdo Silver 701 Four tubes, 807 final, 80m - 6m pictures

  DESCRIFTION:  Model 701 Transmitter is a modernized, post-war example of the basic transmitter  featured in most recent editions of the A.R.R.L. Handbook.  It consists
  of a Tritet crystal oscillator driving an 807 beam power amplifier. It goes well beyond the early design in that it incorporates recent tube and circuit improvements,
  includes 6-meter operation, plus a push-pull modulator for phone operation. Compactly and expertly constructed to size only 10" long, 5" high and 5½" deep in cabinet,
  it is not only a transmitter of extraordinary flexibility and effectiveness, but probably the most powerful, size for size, so far available.
  
  Model 701 circuit consists of a 6AQ5 miniature beam tetrode fuctioning as Tritet crystal oscillator to deliver output upon crystal frequency, or optionally upon 2nd or
  4th harmonic of crystal frequency. This oscillator drives an 807 beam tetrode power amplifier to a maximum of 75 watts plate input on CW, or to 30 watts input for 100%
  modulation in phone work.  The push-pull modulator employs two 6AQ5 tubes to deliver 14 to 15 watts audio output sufficient to 100% modulate 30 watts plate input to
  the final amplifier.  Any good carbon microphone may be plugged into the MIKE jack upon the panel, the transmitter supplying microphone current to this, the most
  efficient and generally satisfactory type of speech microphone available to the amateur.  Key jack is provided oscillator cathode circuit to allow break-in operation.
  Fixed antenna coupling coil allows direct feed to a suitable antenna, or through an antenna tuner.
  

• W7EKB's glowbug pages
• Big Nick's 1942 ARRL Radio, and Novice 80, 40, 15m Transmitter.
• MakeARadio.
• 100W UHF with 2 x MRF646.
• ZL2JJ's Homebrew TRF Receiver.

Power Amplifiers