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 #54386
Joined: Sat Jan 31 2015, 08:28PM
Location:
Posts: 8
Hi guys. Please check the diagram. This is the plate and screen supply for a class C tube oscillator. I just want to make sure that I can just tie together the two -'ve rails in the diagram. The 4 * Vac * sqrt(2) goes to the plate of my tube. and the bridge rectified AC with a filter cap goes to my screen. can I just tie the two negative rails together directly, or do i need some sort of (diode? cap?) blocking. Oh, and given my drawing skills, i omitted bleeder resistors and AC shunting caps across the electrolytics indicated.
Hope this is adequate info to get a lil help from the pros here.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
It would help if you actually put up a complete circuit diagram of the oscillator together with the valve type - then we could determine how its power supply requirements should best be met.
Registered Member #54386
Joined: Sat Jan 31 2015, 08:28PM
Location:
Posts: 8
Sorry, the circuit changes almost every time I play with this thing. As of now, this is part of an audio-modulated (via cathode modulation using an IRF630N) mini plasma tweeter using a 6KG6. Power supply as shown above plus: A) 2.5K resistor in series / 22uF filtering in parallel with screen supply B) 40mm diameter, .5mm wire for a 40 turns inductor to the plate C) 25mm diameter, .5 wire for 130ish turns resonator, oscillating in the low MHz range. D) Feedback from a loop of metal ----> 2.2nF ---> control screen / 300k resistor to ground. And the whole thing littered with lil RF caps to protect everything
Here is 3-4 design iterations ago (it worked fine, but I always wanna fix what aint broke, and light my cigarettes off of it). The music is (duh) coming from the discharge.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I can't really comment on something that doesn't have a circuit diagram, except to say that the design of valve oscillators requires strict attention to mechanical and thermal stability, the use of high quality parts such as ceramic valve holders, effective shielding and screening to reduce electromagnetic compatibility issues, and with power oscillators, effective measures against parasitic oscillation and radiation of harmonics.
Registered Member #54386
Joined: Sat Jan 31 2015, 08:28PM
Location:
Posts: 8
*Shrug. At these levels I've been able to run it multiple hours without redplate or redscreening, and have had zero malfunctions on audio sourced despite directly plugging in many a smartphone to it. I will draw up a diagram today. My longterm goal for this modulated power oscillator is to switch to plate modulation using the entire 0V to max ratings span from silent to full output.
In the video, you can see a black cable coming in from left screen with what looks like a disordered clump of electronic components. In reality, the entire cathode modulator circuit is built onto the audio cable itself.. only needs one to attach MOSFET drain to cathode, source to -ve rail.
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.
Class C tube oscillator negative rail question
