[Amps] Tube Theory?

[Carl]

Audiophools regularly use 304TL's, 833A, 250TH/TL and other large glass 
tubes as single ended Class A amps.

Carl
KM1H


----- Original Message ----- 
From: "Patrick Barthelow" <apolloeme at live.com>
To: <gm3sek at ifwtech.co.uk>; <amps at contesting.com>
Sent: Thursday, June 21, 2012 12:17 PM
Subject: Re: [Amps] Tube Theory?


>
> A single site mother lode of Tube information, many links:
>
> http://www.tubebooks.org/tube_data.htm
>
> What it does not explain is how/why there are companies that are able to 
> sell  200 watt TUBE audio amps  (using 3-400Z, looks like) for $18,000.
> Nor does it give out that company's customer list.  Somewhere there is a 
> photo of a "monoblock"  tube amp with a large Transmitting tube in 
> prominent position
> for $18,000, two required for stereo.   If you want to satisfy real needs 
> for QRO HF amps, you can fund your habit simply by building a "high end"
> audio tube amp or two, each year.
>
>
>
> Best Regards,
> Pat Barthelow,  AA6EG
>
>
>
>
>
>> Date: Thu, 21 Jun 2012 08:54:53 +0100
>> To: amps at contesting.com
>> From: gm3sek at ifwtech.co.uk
>> Subject: Re: [Amps] Tube Theory?
>>
>> Jerry Kaidor wrote:
>> >
>> >   Anybody know a good book to get on tube theory?  I'd just like the
>> >basics on how to go from a set of specs and curves to a design.  I used
>> >to know this stuff but that was a LONG time ago.  We recently moved -
>> >and I can't find a lot of stuff.  Including my 70's college textbook on
>> >devices and circuits, which had a good treatment of it.  Load lines,
>> >plate resistance, quiescent points, interelectrode capacitance, etc
>> >etc. Can't find it anywhere.  I did locate my two copies of "The Art of
>> >Electronics", but they don't say word one about tubes.
>> >
>> >   I have several ARRL handbooks from the 50's to the latest one. Don't
>> >know if there's enough detail in those to actually design anything.
>> >
>> >   I see that "The Care and Feeding of Power Grid Tubes" is now
>> >available as a free download...
>> >
>>
>> By all means read Eimac's 'Care & Feeding' for the tube manufacturer's
>> viewpoint.
>>
>> But by far the best books on the wider subject of transmitter design are
>> the ones written by the Collins engineers:
>>
>> 'Single Sideband Principles and Circuits' by Pappenfus, Bruene and
>> Schoenike, 1st edition 1964.
>>
>> 'Single Sideband Principles and Circuits' by Sabin and Schoenike, 2nd
>> edition 1976, ISBN 0-07-912038-5.
>>
>> The two books are quite different, so be careful about the titles. Each
>> one deserves a ***** rating, but on its own different terms.
>>
>> The 1st edition gives more detail about transmitting tubes and circuits,
>> and is an excellent snapshot of the state of the art as seen by Collins
>> in the early 1960s. The 2nd edition is completely revised, with many
>> more pages and a lot of new material, including chapters on solid-state
>> amplifiers; but it is written more at the block-diagram level and has
>> much less of a hands-on feel.
>>
>> The answer, of course, is to buy them both (go on, you know you will :-)
>> Both books are out of print, but used copies are often available from
>> online booksellers.
>>
>>
>>
>> -- 
>>
>> 73 from Ian GM3SEK
>> http://www.ifwtech.co.uk/g3sek
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>
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