More sweep voltage for the electronic eyeball
The article "The electronic eyeball" in QST, 1 January 1959, stirred my desire to build a panoramic adapter. After building the unit, I found that I could not get enough sweep voltage from the 12AX7 tube for full linear horizontal deflection.
I gave the problem some thought, thumbed through tube data and then decided to use a 6U8 in place of the 12AX7. The results were gratifying. I had almost twice the linear sweep voltage that I had before. The new circuit for the oscillator-amplifier is shown in Fig. 1. The only additional voltage required is 150 volt regulated for the screen of the pentode section.
Fig. 1. Modified sweep circuit for the Electronic Eyeball All resistors are %z watt unless otherwise specified.
Donald C. Hanna, VE2CD.