Quad 33/303

Rotel RB-850

2A3 valve amplifier

JLH phono preamp

Chip-Amp distortion spectra




Sharp PC-1245 pocket computer

Yarvik TAB250 tablet

EO tablet (1992)

Other electronics

Inexpensive Chinese LED-2 video projector

NBOX media player

Digital Video Converter

About me

Old Valve Hifi

Ten-Watt High Fidelity 2A3 Audio Amplifier by W.C. Howe

EVERY provision for perfect audio reproduction has been included in the design of this 10-watt audio amplifier that can be assembled with ordinary tools. Type-2A3 tubes and conservative output rating were selected as being most consistent with pure, clear sound reproduction. Dependable, quality performance fits the unit for work in all fields where high fidelity is important, such as home recording and public address.

So says the February 1938 edition of Popular Mechanics magazine. The whole circuit diagram is below. Perhaps the amplifier design is in fact still viable. 2A3 based amplifiers have been built a lot more recently.

Forty tubes and five loudspeakers

Perhaps you have not considered the interesting possibilities of a receiver using forty tubes and five loudspeakers...

What fascinates me about this is that it has so many valves/tubes in it. Surely there are more here than are required, so what are they doing ? Also, the reference to different "channels" for different frequencies. Does this perhaps contain an early active crossover speaker ? Or are they just talking about a passive crossover. There are no more details.

Amusing review from Popular Mechanics September 1936:

Quick, Easy way to train for ELECTRICITY in 12 weeks by Actual SHOP WORK not books

Want to earn more money?

Have you ever dreamed of holding down a good pay job? Have you ever dreamed of all the things you could have in life if you had a steady job, free from worries of layoffs? Have you ever dreamed of being secure for life with a real future ahead of you?

Then stop dreaming and prepare to get these things. Many fellow no different than you are holding jobs that give them everything they want in life--They are holding these jobs because they prepared themselves by training to hold the job they have.

You may not have much luck sending off the application form shown here. However, if you're thinking of working on valve / tube based hifi, I'd recommend some kind of training.

I've more hifi component reviews on my hifi page.

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