And put in acoustically-isolated HVAC systems to get rid of the heat, as
well.
No foolin' ...
73,
Jim N7CXI
On 6/21/2012 11:20 AM, Carl wrote:
> 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@live.com>
> To: <gm3sek@ifwtech.co.uk>; <amps@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@contesting.com
>>> From: gm3sek@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
>>> _______________________________________________
>>> Amps mailing list
>>> Amps@contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>
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