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Old 14th February 2013, 09:14 PM   #201
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Great movie, recommend:

Electronics at Work - 1943 (Complete) - YouTube
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The Devil is not so terrible as his math model is!
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Old 5th August 2013, 04:07 AM   #202
NZaudio is offline NZaudio  New Zealand
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Your amp is a 2 channel guitaramp with a transistor poweramp.The 2nd. channel has one double tube in the signal path only. It is very unlikely that the tube is faulty. Do you have equipment to start a test procedure? You will need a multimeter, a sinewave generator and an oscilloscope to do a proper repair job.A power load (4 or 8 Ohm resistor that can handle your amplifier output in Watts) would be very handy too.
But have a quick look at the bottom of the board, in many cases there are solder and contact problems, such as items not soldered properly or worn out jack sockets who act as "switch" too etc.
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Old 9th August 2013, 05:27 AM   #203
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Default I can host anything you want to put up

I did notice that your post was, well quit old but so am I so.
If you want to put any techy thing up for everyone let me know.
Servers are quit good everywhere I have ever surfed to them from.
I love most anyting with wires in it.
I come from a telecom, radio, TV, repair family 3rd generation, so me an childhood friend coined it long ago, when we used to tear old radios and amps apart and try to make them work or better. "If it's got wires, it's our's.
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Old 13th August 2013, 08:25 PM   #204
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Default still wondering where to start

The links in this thread that still work are AWESOME !! (A bunch of the early post links are no longer valid) They help greatly in an understanding of the tube operation and related items, but they still don't say anything about where to start either in acquiring [what type or brand] of amp to start with, which ones are better than others, what to AVOID, ect.
If we are interested in learning to fix, what equipment will we need, (what equipment to AVOID) and any of the so called "kits" available -- are they good to build your own?
I know there will be a wide range of opinions, however, it would be good to get all that input from everyone "in the know" for us who are looking to buy our first tube amp (pre amp???) what speakers, what turntable, what reel to reel, ect.
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Old 7th October 2013, 11:16 PM   #205
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Thank you Kuei Yang Wang for reminding me of Bonavolta's site (saw it and had a massive "Oh ja!-erlebnis)...

That'll be a great resource for me, thanks...
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Old 1st November 2013, 11:52 PM   #206
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I got bored reading page after page on how valve amps work, so took a look at what's on YouTube. Here's my favorite so far:

http:// http://m.youtube.com/watch?v=ryCr4Y7ypLA
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Old 13th December 2013, 06:52 PM   #207
RajkoM is offline RajkoM  Bosnia and Herzegovina
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To remind and for learning:

http://www.ieeeghn.org/wiki/images/9/91/Schmitt.pdf
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Old 8th May 2014, 07:41 AM   #208
jerrys is offline jerrys  United States
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Default NEETS do that

Quote:
Originally Posted by Layberinthius View Post
8th Grade taught Physics!?

What about a guide for people getting into tube audio whom never got Physics in high school?

I rather like this glossary...Tube-Cad Glossary

Edit: Btw that pdf file is really an excellent resource thanks !
The NEETS modules do exactly that. They start with matter, energy, free electrons, electron cloud, that sort of thing. As the man said, VERY thorough.
If nobody mentioned it, the Forrest Mims series of books are great for beginners in electronics. solid state amplification isn't all that different from tubes and he really makes it dirt simple.
Also, Max Robinson has Fun with Electronics, Fun with Tubes, etc. EXCELLENT place for beginners and nonbeginners alike.
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Old 9th July 2014, 02:29 PM   #209
jpak is offline jpak  United States
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Any recommendations for reading about transformer design, winding, core consideration, etc?
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Old 14th August 2014, 09:27 PM   #210
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Quote:
Originally Posted by jpak View Post
Any recommendations for reading about transformer design, winding, core consideration, etc?
There is a boatload of stuff if you look up 'transformer design' or 'transformer design how to'. The issue is really what is the language you're looking for and how much of it. Mostly numbers?, mostly words?, and how detailed . . . . . .

Here's a good page and here's another

HTH
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