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Old 7th February 2006, 07:22 PM   #51
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As the copyrigth was mean at that time (1948) not to enslave the consummers and make big profit, but to protect the writers and propage the knowledge, I have put the book at http://z10.zupload.com/download.php?...&filepath=6281
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Old 7th February 2006, 11:10 PM   #52
GRD is offline GRD  United States
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Default Thanks!

I've been looking for a copy of Valley and Wallman. One of the Bibles. Thanks for posting.
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Old 8th February 2006, 02:41 PM   #53
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I found 2 other books.

Vacuum Tube Design, RCA, 1940, is a book on how tubes are manufactured and a very interesting reading. Easy to read.

http://z05.zupload.com/download.php?...&filepath=5439

Getting the Most Out of Vacuum Tubes, 1960, is about tubes failures, and a howto get reliables circuits. Among other, a very interesting chapter about hum, microphonics and noise.
Very easy to read.

http://z05.zupload.com/download.php?...&filepath=5441
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Old 9th February 2006, 10:10 AM   #54
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I have put another file with some basic circuits and their Eiquations, a kind of fast reference:
http://z26.zupload.com/download.php?...&filepath=4614

It is a little file, but too big for that forum (around 300k).
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Old 12th March 2006, 08:36 PM   #55
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As the link for the Valley and Wallman is dead, I have put it here: http://rapidshare.de/files/15354050/...s.tar.bz2.html
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Old 18th March 2006, 09:03 AM   #56
Katapum is offline Katapum  Europe
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Hi all,


Just another link with a lot of old books

http://www.pmillett.com/tecnical_books_online.htm
Thanks P. Millett.

Im also looking for Valley and Wallman book.

Katapum
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Old 1st April 2006, 03:41 AM   #57
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Try Amazon for these as used books.
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Old 21st April 2006, 10:35 PM   #58
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Default Getting started with tube amps

Great ideas for reading up on tube amp basics from all of you. Thanks.....Now where do I find information on a specific amp.

I found a Bell Sound Systems PA20 amp at a garage sale. After finding the right fuse, replacing the power cord, cleaning every socket, visually inspecting each tube, and confirming all wires were attached to something, I plugged it in. Power gets to (and through) the on off switch. Nothing else seems to be affected. ...no glow, no heat, no hum. Reading another thread on this site I learned about stored power in capicitors so I have been afraid to go further.

Aside from taking it to a shop, any ideas?

Thanks! DC
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Old 22nd April 2006, 10:13 AM   #59
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For such research, google is your friend. Otherwise, you have to follow the circuit in the amp and write it by hand. The only reference you must have for that is the pining of the tubes, and vacuum amp are not so complicated.

In your case, it can even be enough to check the filaments on the tubes with an ohmmeter and change the defect one. If it is a power tube in a push-pull, you have to change both. If all the tubes are very old, it is best to change all.

BTW, this thread is not the good thread to ask this question. It can be a lot of work to do, and it will be more appropriate in another thread. It can even be appropriate to make 2 threads, one for your problem, and another one similar to this one, but for all kind of shema we can found on the net.
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Old 18th July 2006, 03:45 PM   #60
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http://www.du.edu/~etuttle/electron/elecindx.htm
http://www.du.edu/~etuttle/electron/elect27.htm

ouch... sorry they have already been linked by audiousername


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