A Low Voltage Vacuum Tube OTL Audio Amplifier

In this episode, we revisit the low voltage audio amplifier that we built many, many moons ago. This time though, we’re making one critical change – we’re eliminating the output transformers! That’s right, OTL amplifiers usually use hundreds of volts, but we’re going to attempt to build one at just 48V, and the results are surprisingly good!

Here’s the schematic: https://i.postimg.cc/fLcBGPXt/OTL-AMP-Full.png

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Intro Music adapted from:
Artist: The Runaway Five
Title: The Shinra Shuffle
https://ocremix.org/remix/OCR01847

Music used:
Artist: Red Tailed Fox
Title: Suco de Melancia
https://ocremix.org/remix/OCR01671

Artist: Paper Coelacanth
Title: Amarant’s Night Ride
https://ocremix.org/remix/OCR04182
Artist: Sir_NutS
Title: An Open Galaxy
https://ocremix.org/remix/OCR03963

Artist: N-JekteD
Title: Purgatory
https://ocremix.org/remix/OCR01385

Thanks for watching!

Chapters
0:00 Intro
2:22 OG amplifier baseline
3:23 What we’re going to change
6:08 Did this fool really say “one two B four A”?
9:20 Breadboard testing
11:30 The new hotness!
14:01 Let’s give it a listen
17:00 How does it compare to the OG?
18:12 Outro
19:20 Bunny!