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In Reply to: RE: 65uF capacitor? posted by maxhifi on February 21, 2017 at 10:21:20
This is a great suggestion... and something I have not done. Taking a quick a look through the RCA Radiotron Manual (version 10), pages 1-21 look like a great introduction. I will be reading this as a refresher over the next few days.
I find endeavours more rewarding when I have some knowledge of the fundamentals/ basics. From that point I can build, question, experiment... and can develop understanding.
My tube learning was messy and my knowledge remains gappy. When I started seriously considering building amps as a hobby, I read the NEETS training manual (just the first few modules related to electricity, not the tube part) then goodness knows how many posts and tube-specific articles of various types... then attempted an early edition of Morgan Jones, which was a challenge. I learned how to calculate various types of circuits (and even designed some) and worked through converting schemas to layouts... all before building/modifying my first amp. I'm certainly not suggesting other beginners take this approach(!) - there are more efficient ways.
I still have so much to learn, but time is limited and becoming more so.
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
Follow Ups:
You can downloaded RC-30 too, It's a bit newer than the '10. It really help to have the basics in your pocket. The rca tube manual isn't going to turn anyone into a prodigal amplifier designer, but it will give you an idea what's what and why.
"The rca tube manual isn't going to turn anyone into a prodigal amplifier designer..."
I'm still trying to get my brain around this one!!!! :) :) :)
Chris
Thanks for the info max!
I think I have most of the very basics sorted... or at least know when to look, where to look to find out, and hopefully how to ask questions. Actually, maybe not so great on that last point ;)
Still, a refresher is in order. I just found RDH4 & 10, RTM30 and a heap of others stored on my HD... and also have a few more recent texts in hardcopy. I won't be reading them all in their entirety, but the key sections of the RCA manuals would be a good start.
Setting up and using a basic test rig will be next big challenge...
Cheers,
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
I think RDH4 is pretty great, I especially like the section about power supplies and hum mitigation. I believe it's all online now too. The stuff about hi-fi is very dated, but still useful.There's also all sorts of basic textbooks out there about tube electronics which were intended for vocational level radio repair courses, from the 1930s - 1960s. I have a variety of books of this nature - all of them describe how to draw AC and DC load lines, and find operating points, etc. Some are better written than others but all are sufficient for an introduction and the depth is a little better than the tube manual, it's just the RCA tube manual is so ubiquitous. Keeping eyes open in used bookstores is a good idea.
Negative feedback isn't covered very well in most such books, but understanding the subtleties of negative feedback design isn't totally necessary to troubleshoot and repair amplifiers.
Edits: 02/22/17
They show up on ebay and the used book sites for about $12 and have all the important stuff in a much easier to digest form that its big brother #4.
dave
.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
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