Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => EZ Board postings => Topic started by: Geezer on June 18, 2005, 06:38:02 am
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Leevi
Junior tube assistant
Posts: 141
(4/23/04 12:32 am)
TuInside Tube amps
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I'm reading Dan Torres's book Inside Tube Amps.
He writes and presents a table regarding amplification in his book that the gain can be increased in an amplifier stage by increasing the value of the plate and/or cathode resistor.
Maybe I have misunderstood, but according to my understanding the gain decreases if I increase the value of the cathode resistor. Which one is correct?
Leevi
Woolly
Junior tube assistant
Posts: 7
(4/23/04 4:52 am)
Re: TuInside Tube amps
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increasing cathode decreases gain.,,,that book is full of hype and bad information,,throw it out,, Kevin O'conner's TUT's are much better..
zachsdad
Posts: 16
(4/23/04 5:03 am)
Stage Gain
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The formula for gain is:
(plate resistance) // (plate load) // (following grid resistance)
(1/transconductance) + (cathode resistance)
where // means "in parallel with"
By increasing the numerator, such as plate load, the gain increases.
By increasing the denominator, such as cathode resistor, the gain decreases.
Leslie
tubejunky
Posts: 17
(4/23/04 5:28 am)
Re: TuInside Tube amps
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I'm also in the process of reading Inside Tube Amps, and was confused by that as well. There is some interesting info in the book though, $34 from AES.
Leevi
Junior tube assistant
Posts: 142
(4/23/04 11:38 am)
Re: Inside Tube amps
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Thank you for your answers guys. I have not bought the book, it´s from library. Which one of the Kevin O´Connor´s Ultimate tone book do you recommend? I´m looking for a book that contains good basic information related to tube amplifiers and tube technology. Dan Torres´ book is written for musicians and the way he presents the things is not always so scientific.
/Leevi
Funkalicousgroove
Junior tube assistant
Posts: 78
(4/23/04 12:25 pm)
Re: Inside Tube amps
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The best book out there for this (if you can find a copy) is the 2nd edition of The audio cyclopedia by howard tremaine, it is thorough, easy to understand, and in a question and answer format. WWW.Aikenamps.com is also a wonderful resource for all things musical and tube, he has a listing of reccommended reading as well as some wonderful tech info-check it out-
jc
I only work on Fender's
Posts: 702
(4/23/04 4:07 pm)
Re: Inside Tube amps
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The first TUT book is a good general starting place. The first 2 TUT books are about 1/2 tube and 1/2 solid state. The first book has a lot on channel switching. The 2nd has a lot on solid state amplifiers. The 3rd TUT book is an amplifier projects. He goes through designs for AC-30, plexi, bassman, etc. He tries to use common transformers (hammond). They all have a lot of good information. The first TUT is probably the best starting place.
The aiken site is a great resource along with the web in general.
Leevi
Junior tube assistant
Posts: 143
(4/24/04 11:53 pm)
Re: Inside Tube amps
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thanks jc, below is some more information regarding Kevin O´Connors´books.
/Leevi
www.londonpower.com/books.htm
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