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30 Jun 2015


by Matt Renaud:

What really drove me to build this 6EM7 amp was an idea about amplifier layout. Looking back at most of my tube designs, and most of those on the internet, revealed a very typical pattern. Amplifiers tended to be flat chassis with tubes and transformers above and electronics below. From a historical perspective this makes perfect sense. Metal chassis were built this way to facilitate packaging and assembly. When people started to make tube amplifiers again, they just removed the upper case and built in the same way.

6EM7 Single-Ended Triode (SET) Vertical Amplifier – [Link]

25 Mar 2014



This DIY 300B triode amplifier project was completed by Stamou Tasos who is from Greece. Giovanni Militano and  Stamou Tasos write:

As a thank you for the 300B amplifier schematics, Stamou has shared with us his implementation of the 300B single-ended (SE) tube amplifier schematic by J.C. Morrison. I have assisted by translating, formating and presenting his DIY 300B triode amplifier project.

The circuit that I decided to follow for my 300B triode amplifier I found on this site, the 300B Single-Ended (SE) tube amplifier schematic with direct coupled 6SN7 input stage. Please take a look at the SE 300B schematic for a description of Mr. J.C. Morrison’s SE 300B tube amplifier circuit which I will refer to as the “original schematic”. Specifically recommended in the circuit notes was that premium output transformers and components be used for the 300B amplifier build. For this SE 300B triode tube amplifier build I have used premium parts throughout, Lundahl audio output transformers and a DIY chassis. This 300B Single-Ended-Triode (SET) amplifier circuit uses a direct coupled 6SN7 driver stage. The output stage is a SE 300B triode and the maximum power output is about 8 Watts per channel. A pair of reasonably sensitive (~91 dB+) loudspeakers will be required with this 300B SET amplifier.

DIY 300B Single-Ended-Triode (SET) Hi-Fi Amplifier – [Link]

20 Sep 2011

The memo, distributed to the senior technical staff, contained a ballot asking them to choose a name for a new device invented the previous winter – the semiconductor triode. Several options were presented, including my personal favorite, the Iotatron. [via]

In the end, the name “transistor” (“transconductance” + “varistor”) won out over all the others, but it’s still interesting to read the discussion of the other names. I love the note for “solid triode”:

This has the advantage of brevity, and is descriptive in the sense that the device may be explained by the physics of the solid state, and also that the active element is a solid rather than vacuum or gas filled. However, the word “solid” also commonly means sturdy, massive, rugged, or strong, which terms are contradictory to the actual physical characteristics of the unit.

How The Transistor Got Its Name – [Link]





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