Monday, February 12, 2018

Totally Tubular - images

The inside of a Heathkit HW-101 is too interesting not to photograph

List of tubes and their function used in the HW-101

OA2 Regulator (150 V).
6HS6 RF amplifier.
6HS6 1st receiver mixer.
6AU6 Isolation amplifier.
6AU6 1st IF amplifier.
6AU6 2nd IF amplifier.
6BN8 Product detector and AVC.
6AU6 VFO Amplifier.
6CB6 2nd transmitter  mixer.
6CL6 Driver.
6EA8 Speech Amplifier  and cathode follower.
6EA8 1st transmitter  mixer.
6EA8 2nd receiver mixer and relay amplifier.
6EA8 CW side-tone oscillator and amplifier.
6GW8 Audio amplifier and audio output.
12AT7 Heterodyne oscillator and cathode follower.
12AT7 VOX amplifier and calibrator oscillator.
12AU7 Sideband oscillator.
6146 Final amplifiers (2).

The glowing filaments and grids of tubes are a sight not often seen in today's transistorized world of amateur radio.  I hope you enjoy the images...

Video with CW QSO

Brief video ending with WES exchange CW QSO.  Listen to the old girl in action...

That's all for now


  1. Wow, great pictures and excellent video. I can almost smell the tubes. Thanks a lot...73, Bas

  2. Thanks Bas. Yes the rig smells great, especially after a good 3-4 hours of heat soak.