atkelar | Heathkit T3 Rebuild - Part 2 @atkelar | Uploaded December 2023 | Updated October 2024, 46 minutes ago.
In this video, I'm completing the rebuild of the Heathkit T3 signal tracer I managed to get during the (late) Summer months of 2023. It's one of these restorations wher one thing leads to another... I'm fixing up the speaker, replacing the goo that was the wiring harness and all capacitors. None of the caps showed up as "good" on the leakage testing when the voltage was anywhere near half the rated one. Also a few of the resistors were out of spec, so to keep it simple, I replaced all of them, except the one across the speaker output and the main supply dropper power resistor.
I also needed new probes to go with it, and so I came up with a relative simple design. The 3D printed parts were supposed to be turned on the lathe, but my order of Delrin(tm) arrived a bit too late, so along with the rubber feet, this might be an eventualy replacement part.
To finish off the rebuild, I'm explaining the circuit theory and give a brief example of the individual use cases; Mind you, the audio that is coming from my test case radio is kept on a muffled level deliberately, to avoid copyright claims for the radio program. It's nowhere near as bad as it seems ;)
0:00 Intro and Recap / Socket Cleanup
1:50 Speaker Repair
3:04 Front Panel Decals / Wire Harness and Component Issues
4:25 Assembly Time! Audio Sockets and Speaker / Speaker Connectors / IEC Socket
5:45 Audio Transformer / Chassis / Potentiometers / Filter Capacitor
7:37 Tube Sockets / Mains Wiring / Rectifier = DC!
8:40 Front Panel Wiring / First Stage / Eye Tube Test
9:44 Second Stage / Third Stage
10:55 Case Closed! / New Knobs / Wattmeter Issue
12:33 IEC to Anythign Adapter
14:47 Wattmeter Calibration / Probe Description / RF Probe Circuit Build
15:58 Probe Build: Cable and Design / Lathe Work / Probe Tips?!
17:34 Nickel Plating / Spring and Overall Design
18:55 Assembling Probe
19:46 Testing and Circuit Description
22:45 Overview / Thanks / Credits and Teaser
References:
Video with speaker repair, pointed out by Cheetah: youtu.be/N9sue46dUYA
Music:
My Train's A Comin'
Unicorn Heads
(YouTube Audio Library)
You can support me on Ko-Fi: ko-fi.com/atkelar
...and also on Patreon: patreon.com/Atkelar
...and you can also drop a virtual coin into the YouTube hat by using the "Super Thanks!"
Thanks to everybody who signed up already!
In this video, I'm completing the rebuild of the Heathkit T3 signal tracer I managed to get during the (late) Summer months of 2023. It's one of these restorations wher one thing leads to another... I'm fixing up the speaker, replacing the goo that was the wiring harness and all capacitors. None of the caps showed up as "good" on the leakage testing when the voltage was anywhere near half the rated one. Also a few of the resistors were out of spec, so to keep it simple, I replaced all of them, except the one across the speaker output and the main supply dropper power resistor.
I also needed new probes to go with it, and so I came up with a relative simple design. The 3D printed parts were supposed to be turned on the lathe, but my order of Delrin(tm) arrived a bit too late, so along with the rubber feet, this might be an eventualy replacement part.
To finish off the rebuild, I'm explaining the circuit theory and give a brief example of the individual use cases; Mind you, the audio that is coming from my test case radio is kept on a muffled level deliberately, to avoid copyright claims for the radio program. It's nowhere near as bad as it seems ;)
0:00 Intro and Recap / Socket Cleanup
1:50 Speaker Repair
3:04 Front Panel Decals / Wire Harness and Component Issues
4:25 Assembly Time! Audio Sockets and Speaker / Speaker Connectors / IEC Socket
5:45 Audio Transformer / Chassis / Potentiometers / Filter Capacitor
7:37 Tube Sockets / Mains Wiring / Rectifier = DC!
8:40 Front Panel Wiring / First Stage / Eye Tube Test
9:44 Second Stage / Third Stage
10:55 Case Closed! / New Knobs / Wattmeter Issue
12:33 IEC to Anythign Adapter
14:47 Wattmeter Calibration / Probe Description / RF Probe Circuit Build
15:58 Probe Build: Cable and Design / Lathe Work / Probe Tips?!
17:34 Nickel Plating / Spring and Overall Design
18:55 Assembling Probe
19:46 Testing and Circuit Description
22:45 Overview / Thanks / Credits and Teaser
References:
Video with speaker repair, pointed out by Cheetah: youtu.be/N9sue46dUYA
Music:
My Train's A Comin'
Unicorn Heads
(YouTube Audio Library)
You can support me on Ko-Fi: ko-fi.com/atkelar
...and also on Patreon: patreon.com/Atkelar
...and you can also drop a virtual coin into the YouTube hat by using the "Super Thanks!"
Thanks to everybody who signed up already!
