UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Other Discussions > Homebrew Equipment

Notices

Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members.

Closed Thread
 
Thread Tools
Old 1st Feb 2019, 8:28 am   #1
anikimtiaz1990
Triode
 
Join Date: Mar 2016
Location: Dhaka, Bangladesh
Posts: 30
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....
anikimtiaz1990 is offline  
Old 1st Feb 2019, 10:30 am   #2
Radio Wrangler
Moderator
 
Radio Wrangler's Avatar
 
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,803
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
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
Radio Wrangler is online now  
Old 4th Feb 2019, 9:25 pm   #3
G0HZU_JMR
Dekatron
 
Join Date: Sep 2010
Location: Cheltenham, Gloucestershire, UK.
Posts: 3,077
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.
Attached Thumbnails
Click image for larger version

Name:	distamp.jpg
Views:	152
Size:	133.3 KB
ID:	177743  
__________________
Regards, Jeremy G0HZU
G0HZU_JMR is offline  
Old 5th Feb 2019, 3:28 am   #4
Terry_VK5TM
Nonode
 
Terry_VK5TM's Avatar
 
Join Date: Oct 2010
Location: Tintinara, South Australia, Australia
Posts: 2,324
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.
__________________
Terry VK5TM
https://www.vk5tm.com/
Terry_VK5TM is offline  
Old 5th Feb 2019, 7:17 am   #5
n_r_muir
Hexode
 
n_r_muir's Avatar
 
Join Date: Jul 2007
Location: Edinburgh, UK.
Posts: 344
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
n_r_muir is offline  
Old 5th Feb 2019, 7:21 am   #6
Radio Wrangler
Moderator
 
Radio Wrangler's Avatar
 
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,803
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
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
Radio Wrangler is online now  
Old 5th Feb 2019, 11:07 pm   #7
G0HZU_JMR
Dekatron
 
Join Date: Sep 2010
Location: Cheltenham, Gloucestershire, UK.
Posts: 3,077
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.
__________________
Regards, Jeremy G0HZU

Last edited by G0HZU_JMR; 5th Feb 2019 at 11:17 pm.
G0HZU_JMR is offline  
Old 6th Feb 2019, 12:46 am   #8
Radio Wrangler
Moderator
 
Radio Wrangler's Avatar
 
Join Date: Mar 2012
Location: Fife, Scotland, UK.
Posts: 22,803
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
__________________
Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
Radio Wrangler is online now  
Old 6th Feb 2019, 10:37 am   #9
GMB
Dekatron
 
GMB's Avatar
 
Join Date: Aug 2003
Location: near Reading (and sometimes Torquay)
Posts: 3,086
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
GMB is online now  
Old 6th Feb 2019, 7:44 pm   #10
m0cemdave
Octode
 
Join Date: Feb 2009
Location: Bletchley, Buckinghamshire, UK.
Posts: 1,205
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...
m0cemdave is offline  
Old 6th Feb 2019, 8:29 pm   #11
G6Tanuki
Dekatron
 
G6Tanuki's Avatar
 
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,953
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 ]
G6Tanuki is offline  
Old 6th Feb 2019, 9:31 pm   #12
turretslug
Dekatron
 
turretslug's Avatar
 
Join Date: Nov 2011
Location: Surrey, UK.
Posts: 4,385
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.
turretslug is offline  
Old 7th Feb 2019, 8:53 pm   #13
anikimtiaz1990
Triode
 
Join Date: Mar 2016
Location: Dhaka, Bangladesh
Posts: 30
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.....
anikimtiaz1990 is offline  
Old 7th Feb 2019, 8:57 pm   #14
anikimtiaz1990
Triode
 
Join Date: Mar 2016
Location: Dhaka, Bangladesh
Posts: 30
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.....
anikimtiaz1990 is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 2:03 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.