The AM Forum
July 17, 2024, 04:05:21 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
Author Topic: Not quite class E-but Class D...hollow state!  (Read 3993 times)
0 Members and 1 Guest are viewing this topic.

Offline Offline

Posts: 160

« on: July 19, 2020, 05:31:38 PM »

So a few years ago I sponsored a contest on another electronics forum, and issued this challenge-Build a single-channel audio amplifier using ONLY dissimilar section tubes, and you must use all sections. No dual triodes, no single pentodes, etc-each section must be different.

Tim, as he usually did at the time, decided Class A wasn't good enough, so built the Borg. And he won the contest, handily.

Tube based PWM generator and class D tubes. Gets reasonably close to mosfet performance, too. Maybe applicable to Class D AM transmitters, if you really wanted to go the difficult route!

* Elec_Compound.gif (5.15 KB, 526x252 - viewed 818 times.)
Patrick J. / KD5OEI
Offline Offline

Posts: 8281

« Reply #1 on: July 21, 2020, 06:06:00 PM »

Efficiency and power isn't everything. Remember, weirdness counts!

Radio Candelstein
Steve - K4HX

Offline Offline

Posts: 2724

« Reply #2 on: July 22, 2020, 12:15:31 PM »

Several of the east coast AM gang have built tube based PDM modulators for tube final rigs, some as far back as the 1970s or 80s.
Pages: [1]   Go Up
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.066 seconds with 18 queries.