Building a class A audio amplifier - no audio out

RCA published a series of transistor dta books throungh the '60s & '70s. The basic circuit was published right after RCA released the

40411 output transistors used in that circuit. If you take a look, they run in consecutive type numbers, which indicates they were chosen for that application. Amps built with the RCA parts were good, for their time, but the clones often used other transistors and had problems. The 40411 was rated to 100 volts, which was a lot higher than most power transistors of that time.

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You can\'t have a sense of humor, if you have no sense!

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Well in lieu of having that nice data book, the free online patent literature gives this, among others:

from

Thanks,

Michael

need

All of those are dated in the '70s, and are newer that the data I was looking for, for you.

I couldn't find any of my oldest RCA books, or I would have scanned the ap note for you.

I see a copy of SC11 for sale near here on ABE Books, but it is too old. It first appeared in SC12 or SC13.

It is about a half hour drive from here, and near a flea market i haven't been to in almost 10 years. The store wants $5 for it, plus local tax.

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You can\'t have a sense of humor, if you have no sense!

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Ah ok, I appreciate the efforts you are going to, to locate the article. Thank you. But please don't trouble yourself driving to search for the book on my behalf. I wouldn't want to inconvenience you.

I was hoping to find something online by searching the Google patent literature with "RCA" as the assignee. And it may even be possible that my dad may have the data book, or a similar one. It's just not very often that I get to see him.

Thanks,

Michael

True but shortly therafter RCA offered the 140V 2N3773 which with 4 devices could deliver ~ 200W into 8 ohms with a decently regulated supply.

That device ruled the roost for a long time.

Modern Toshiba ( and other ) audio output semis got to 230V or so. I well recall designing my first amp with +/- 100V main rails.

Graham

Not terribly helpful I'm afraid.

Had I read Win's book ( The Art of Electronics ) I might recommend it. I have no idea if it has a specialist audio section though ( hint Win ).

Graham

Mulling over old designs has its interest in some ways but you'd do far beter to concentrate on newer technology that's not impaired by old limitations of device fabrication issues etc.

Go to the Doug Self site for example.

Graham

I drove down there this morning, to visit the flea market and ran into a couple friends I hadn''t seen in ten years. The book store was a couple miles further south, but they told me anything listed on Abe books was kept at a separate location. It turned out ok, I found 20 old science fiction books for my collection. It was a rough drive, but well worth the trip. :)

I didn't know they were doing controlled burns in the forest, so there was a lot of thick smoke in some places. :(

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You can\'t have a sense of humor, if you have no sense!