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Old 1st Feb 2019, 8:28 am   #1
anikimtiaz1990
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Default 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....
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Old 1st Feb 2019, 10:30 am   #2
Radio Wrangler
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Default 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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Old 4th Feb 2019, 9:25 pm   #3
G0HZU_JMR
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Default 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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Old 5th Feb 2019, 3:28 am   #4
Terry_VK5TM
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Default 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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Old 5th Feb 2019, 7:17 am   #5
n_r_muir
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Default 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
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Old 5th Feb 2019, 7:21 am   #6
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Default 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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Old 5th Feb 2019, 11:07 pm   #7
G0HZU_JMR
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Default 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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Old 6th Feb 2019, 12:46 am   #8
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Default 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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Old 6th Feb 2019, 10:37 am   #9
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Default Re: Distributed amplifier

If you want to see an example of a really powerful one, look at this:

http://air-ministry.uk/Model122amplifier.pdf
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Old 6th Feb 2019, 7:44 pm   #10
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Default 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...
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Old 6th Feb 2019, 8:29 pm   #11
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Default 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 ]
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Old 6th Feb 2019, 9:31 pm   #12
turretslug
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Default Re: Distributed amplifier

Quote:
Originally Posted by GMB View Post
If you want to see an example of a really powerful one, look at this:

http://air-ministry.uk/Model122amplifier.pdf
Last year at Dunstable Downs someone was offering something rather like that (as I recall), a row of 4CX- style devices. Quite an impressive beast.
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Old 7th Feb 2019, 8:53 pm   #13
anikimtiaz1990
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Default 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.....
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Old 7th Feb 2019, 8:57 pm   #14
anikimtiaz1990
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Default 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.....
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