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1st Feb 2019, 8:28 am | #1 |
Triode
Join Date: Mar 2016
Location: Dhaka, Bangladesh
Posts: 30
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Distributed amplifier
Hello..
Does anyone have the document named " distributed amplification" by ginzton and hewlett.? I dont have access on ieee group...and is unable to find any pdf. Also can you guys suggest some good books on vacuum tube distributed amplifier desing...? Thank you.... |
1st Feb 2019, 10:30 am | #2 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,867
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Re: Distributed amplifier
I have found it on the internet some time ago when looking for it, so it may still be out there. Noe was also one of the authors.
I had a paper copy at work which a librarian obtained from the British Library, so I didn't bother keeping an electronic copy when I found it on the internet. That paper copy, my desk, and the whole HP building are all long-gone, I'm afraid. David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
4th Feb 2019, 9:25 pm | #3 |
Dekatron
Join Date: Sep 2010
Location: Cheltenham, Gloucestershire, UK.
Posts: 3,077
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Re: Distributed amplifier
I have IEEE access at my PC at work so I had a go at downloading your doc.
However, it is 2.5Mb in size so it (just) exceeds the forum limits for a pdf file. I've attached an image of the first page below. Is this the correct document? If so I'll try and find a way to send it to you.
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Regards, Jeremy G0HZU |
5th Feb 2019, 3:28 am | #4 |
Nonode
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,339
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Re: Distributed amplifier
Try zipping it (as in .zip file) and see if it comes in under the 1.91Mb limit, then it can be posted here.
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5th Feb 2019, 7:17 am | #5 |
Hexode
Join Date: Jul 2007
Location: Edinburgh, UK.
Posts: 344
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Re: Distributed amplifier
Good practical examples of valve based distributed amplifier designs are used in the vertical amplifier stages of the Tektronix 545A and the 548A Oscilloscopes of the late 1950/ early 1960's. As far as I remember there is a good description of these in the Tektronix instruction/service manuals which can be downloaded from the BAMA website.
Ross |
5th Feb 2019, 7:21 am | #6 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,867
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Re: Distributed amplifier
That is the right paper, Jeremy.
It is the seminal paper on distributed amplifiers. I had a copy in my files for decades. All the design equations you need, and some interesting stuff on tapered lines. David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
5th Feb 2019, 11:07 pm | #7 |
Dekatron
Join Date: Sep 2010
Location: Cheltenham, Gloucestershire, UK.
Posts: 3,077
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Re: Distributed amplifier
Thanks, David.
It sounds like you might be interested in a copy too! Therefore, I've tried to upload it here: https://www.qsl.net/g/g0hzu//RF%20Tr...F/01697772.pdf Let me know if the link works for you. I tried zipping the pdf file but it didn't reduce in size much. It was still too big... Hopefully, the link above will work.
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Regards, Jeremy G0HZU Last edited by G0HZU_JMR; 5th Feb 2019 at 11:17 pm. |
6th Feb 2019, 12:46 am | #8 |
Moderator
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,867
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Re: Distributed amplifier
Thanks, Jeremy, that's a good clean copy. I think I may still have a copy of a copy somewhere, and it's complete with the references etc.
It's a really important paper. It set out the whole business, and lives on in the wideband integrated distributed amps going up into the millimetre bands. Cheers, David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
6th Feb 2019, 10:37 am | #9 |
Dekatron
Join Date: Aug 2003
Location: near Reading (and sometimes Torquay)
Posts: 3,094
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Re: Distributed amplifier
If you want to see an example of a really powerful one, look at this:
http://air-ministry.uk/Model122amplifier.pdf |
6th Feb 2019, 7:44 pm | #10 |
Octode
Join Date: Feb 2009
Location: Bletchley, Buckinghamshire, UK.
Posts: 1,219
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Re: Distributed amplifier
Chapter 10 of the book "Radio Transmitters" by V.O. Stokes is a full write-up on the design of the high power types. Worth a read if you can find it.
The 1kW amplifier panels (using 4CX250B's) occasionally turn up at radio rallies. I've seen at least two, over the years, at Stockwood Park. I don't know if anybody has got one going. It seems there was a 40kW version too... |
6th Feb 2019, 8:29 pm | #11 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,996
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Re: Distributed amplifier
They were used in cable-TV 'launch amplifiers' - the circuit of the type designed by EMI and used in the Abingdon cable-TV project is here:
http://www.aeolian-hall.myzen.co.uk/circuit.gif http://www.aeolian-hall.myzen.co.uk/fig28a.gif [Complete description of Abingdon cable-TV is here: http://www.aeolian-hall.myzen.co.uk/mva.htm ] |
6th Feb 2019, 9:31 pm | #12 | |
Dekatron
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,394
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Re: Distributed amplifier
Quote:
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7th Feb 2019, 8:53 pm | #13 |
Triode
Join Date: Mar 2016
Location: Dhaka, Bangladesh
Posts: 30
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Re: Distributed amplifier
Hello evryone....
I apologise for the late reply.....i am really sorry...... And i got the paper......thank you all for your help and kind suggestion.your opinion is very valuable to me....as where i live no one knows anything about vacuum tube technology....i have nowhere to go...but got a great place to talk here..... |
7th Feb 2019, 8:57 pm | #14 |
Triode
Join Date: Mar 2016
Location: Dhaka, Bangladesh
Posts: 30
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Re: Distributed amplifier
I am just wondering. ..that can i make the range to more low frequency? ...like from 10 hz to 1 mhz...? I am new to tube electronics....so trying to keep the power as low as 50 watt per se....as some of you people suggested me earlier.....can i cover this range as i mentioned previously with this technique....?
And thank you all again..... |