DG’s Practical Notes, R#20 Hallicrafters Sky Buddy S19, first run, 1938

DG’s Practical Notes
© 2021-2024 Daniele Giacomini, [email protected]
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======== Content of this video ========
(0:00:00) Front cover
(0:00:10) ⚠ Warning
(0:00:20) Table of contents
(0:00:40) Introduction
(0:02:22) Extracting the chassis
(0:06:30) Initial electrical condition
(0:07:04) Removing the variable capacitor gears
(0:08:05) Cleaning the chassis
(0:09:01) Wobbly variable capacitor
(0:09:59) Testing AC voltages
(0:10:29) Restuffing the capacitor can
(0:13:38) Halogen light bulb in series with the B+ line
(0:15:35) Spade connectors for the speaker
(0:16:29) Output impedance
(0:18:29) Internal oscillation in the audio section
(0:19:37) Early testing
(0:22:26) Getting back the tuning shaft
(0:22:59) A «new», second I.F. transformer
(0:28:51) First I.F. transformer
(0:35:32) I.F. alignment
(0:37:35) Cleaning and installing the tuning mechanism
(0:42:42) Cleaning the dial
(0:44:22) R.F. alignment
(0:49:18) Verify oscillator frequency
(0:51:11) More testing
(0:58:55) BFO alignment
(1:01:03) Schematics, mysteries and adaptations
(1:04:36) Cabinet
(1:07:57) Putting the radio back together
(1:15:55) The external disk dial cannot be accurate
(1:17:23) The top panel
(1:18:34) Installing the knobs
(1:19:34) Final test? Not yet.
(1:20:38) Loudspeaker troubles
(1:22:22) External frequency counter
(1:25:44) Back on the workbench
(1:27:25) Casualty list, final look inside and final notes
(1:28:25) Reveal
(1:50:44) Hum again
(1:52:31) Appendix: removing and installing a new tube base
(1:57:39) Back cover
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Tags: vacuum tubes, antique radios, old radios, vintage radios, old electronics, vintage electronics, vacuum tube equipment