Showing posts with label triode. Show all posts
Showing posts with label triode. Show all posts

Monday, December 8, 2014


An early article about the 250 from the Westinghouse Lamp Company.  I wonder if Tesla was still working for Westinghouse in 1929?
Here are a couple examples of the mighty 50. The first is my fave as the construction is over the top compared to the others which I am sure are great tubes. But you have to admit they look sad by comparison. 

Monday, October 6, 2014

Tone Quality - General Amplifier Company - 1929

They do not get points for creative company names but I like the industrial look of their gear. They are building around the 250  and 245. I with they had a picture of the GA40 with four 250's and four 280's. Certainly overkill back in the day.

Wednesday, September 24, 2014

Designing And Constructing Direct-Coupled A.F. Amplifiers Part 2 - 1933

Here is part two of a 1933 article from Radio Craft on designing Direct Coupled amps.

Monday, September 8, 2014

Engineering Features Of The UX-245

A great article about one of our favorite triodes the 45.

Tuesday, December 1, 2009

Brook Electronics Since 1934

First in the High-Quality Audio Field Since 1934

Brook was among the first consumer Hi-Fi audio companies. Born out of the glory days of the triodes.

Model 22A Integrated

Here is a very detailed 22A schematic.

Model 7 Preamp

Documentation on the Brook models is rare. I have scavenged for what I have posted here and some I haven't but what isn't posted is mostly schematics. That is except the next post which will have an ultra rare PWK mod of the Brook 12A schematic specifically for the Klipschorns.