If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Dr Spark -
Certainly you could build two completely "independent" tank circuits, but having a symmetrical center-tapped primary driving a symmetrically-terminated secondary should allow use of a conventional push-pull vacuum-tube driver topology.
Large triodes in push-pull layouts have been used for years in high power industrial induction heating systems. D. Sharpe was kind enough to provide several US patent numbers showing power oscillators with push-pull drivers:
2,464,252 (J. Moore; 3/15/1948) 2,540,275 (E. Mittelman of EIMAC fame; 2/6/1951) 2,579,374 (D. Edwards; 12/18/1951) 3,119,971 (M. Cleland, etal; 1/28/1964) 3,638,657 (H. Mettler; 2/1/1972) 3,747,013 (H. Mettler; 7/17/1973)
These patents can be viewed at no cost from the US patent office website (). Read the instructions on downloading the appropriate viewing software.
Registered Member #1642
Joined: Sun Aug 17 2008, 11:36PM
Location: Black Canyon City
Posts: 96
Herr Zapp,
Your idea is fantabulous! I never considered the independent horizontal "bipolar" scheme as you mentioned. As you can see, a few of us have tried all sorts of variations (using a single-ended secondary) to no avail. I don't know where the "modified Steve Ward" schematics shown above came from; but I tried every one of those. The results are all part of the previous thread I mentioned earlier that didn't work for me. I have documented most of my "failed work" Maybe I missed something. I am considering adding the "failed" attempt documentation to the website, because the finished product took a hard left turn compared to the original dream. Documenting my failed attempts doesn't bother me in the least. Like I always say "If you dare dream it, build it!" Dr. Spark and I worked on this project for nearly a year. The problem was...this was virgin territory...no information anywhere...probably for good reason..maybe it didn't work for our elders either!!
A good lesson to learn: I have an old ham radio friend; he is now 92 yrs old. He is an extrordinary high powered amplifier builder. I was building a dual 4CX250B amplifer at the time and had some questions about the tank coil configuration and additional coil for 160meters. He proceeded to open William Orr's Handbook of Radio Electronics to a table of coil information with power/plate voltage ratios,etc. and said "get this book...they have already done all the hard work for you and this works the best! don't waste your time re-inventing the wheel" He was right! They never seem to publish the mistakes..only what works!
That being said; good luck on the "modified" single ended design. I would definitly be very interested in seeing the bipolar version as there may be some merit in this. I can't say whether it will work as I haven't tried it either.
Registered Member #480
Joined: Thu Jul 06 2006, 07:08PM
Location: North America
Posts: 644
Drs. Hankenstein & Spark -
I'm trying to get a small "proof-of-concept" horizontal "bipolar" push-pull VTTC put together by WWT'09.......
Candidate triodes include 572-B, 805, or 304TL. Layout includes fixed center-tapped primary with dual feedback windings on the primary coilform outboard of the actual primary, split secondary with axial coupling adjustment, and "skeleton" toroids fabbed from rings of 1/4" or 3/8" dia stainless-steel tubing. I've got all the parts on-hand, the challenge will be to find time for assembly & tuning .....
Dr. Hankenstein - The book you mentioned by William Orr ...... do you have a copy? If so, can you tell me the exact title, or the ISBN#? I can find his "VHF Handbook" (ISBN unknown), and his "Radio Handbook" (ISBN 0672224240), but no "Handbook of Radio Electronics".
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
hello Herr Zapp and others I have done some reading in radio amature handbook 1956 and re read Steve's page again and come up with my starting point. The changes I have done to Steve's scematic are : 1: less turns on the secondary is for higher Q and higher current, 12 AWG 2: I reduced the grid feed back resister by half because there will be twice the negitive cycles charging up the grid feed back capacitor 3: L2 the number of turn are subjective maby 25 turns with a center tap 4: notce the phaseing dots the changes were done with paint any Questions are welcome N.B.
Registered Member #1642
Joined: Sun Aug 17 2008, 11:36PM
Location: Black Canyon City
Posts: 96
Herr Zapp; Are you kidding me? You're actually bringing a real coil this year??! Bride of Hankenstein doesn't believe it's true! For that you will definitely be rewarded with a genuine "wheel of fire" corona ring! (Since you've already got the jugs)
BTW: You're right, William Ore's book is titled "Radio Handbook". I have a copy myself and highly recommend it. Couldn't remember the exact name as my books are still in boxes.
Registered Member #3062
Joined: Wed Aug 04 2010, 02:07AM
Location:
Posts: 22
I know this thread is really old but I was wondering what ever happened with the push pull VTTC. Did anyone ever confirm/deny whether the circuit worked? If so could someone post a picture of the schematic/coil I might be interested in building a coil like this in the near future if its doable
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
looking for a push pull schematic for VTTC
