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 #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
Gen. Radio 1233-A Power amplifier with all tubes intact. I've been tweaking on it trying to get it to output more RF power because it has 2x 807's, but it blew something out recently and I have to rebuild again. The phase splitter refuses to balance and I had to scrap the enitre HV section, so I'm planning on gutting the whole thing and maybe prototyping the amp until it does what I want it to do. I want to save the chassis if possible, but there are a lot of things I want to add to it like VSWR output metering, and cathode current metering on both tubes.
Registered Member #122
Joined: Fri Feb 10 2006, 12:55PM
Location: Milano Italy
Posts: 148
Hi All!
2,5 kW RMS audio tube power amplifier designed for working at full power for months without problems. (was used to drive a shacker coil for a long term industrial vibration testing machine) plus the shacker (an enormous subwoofer without the cone), the waweform generator and some accessories (much more than 1 TON total weight!).... everything for free!!!!
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Nice amp Hazmatt :)
FWIW, that model apparently has a frequency range of 20Hz to 3MHz. From the looks of it, it's built like a push-pull audio amp, so you won't get much RF power out of it.
*edit* Fabio simulposted, so I just saw his 2.5kW tube amp. Awesome! Can I come over and play bass through it? :D I think the enormous Partridge lump in the first picture is the output transformer, not the power supply. It's probably separate because the rack would crumble under the weight!
Oh, also I see it has six KT88s in it too, but they're just driver tubes.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
Yea its designed as a push-pull amp, but I should be able to get at least 25W RF out at 50R. It has 2 cores in it to select from 20Hz to 20KHz eg. a big metal toroid, and a smaller ferrite toroid for 20KHz to the 3MHz. I am hoping that a redesign of the phase splittler will get it back on its feet. I'll probably have to redesign the B+ supply board too because the radiated heat is too much for the bias adjust pots I put on the new PCB.
Love the shaker amp. You can see the HT transformer in the big grey box. What are the 2 main output tubes?
I'd put that baby in a small row of theater seats, set up my projector and watch Die Hard or Terminator... heheheheh!
Registered Member #514
Joined: Sun Feb 11 2007, 12:27AM
Location: Somewhere in Pirkanmaa, Finland
Posts: 295
Will wrote ...
At this time, not the most useful, but most definitely the most worth. I got paid to take it home.
I dunno, I always salvage everything I can, but it's usually nothing valuable. I guess the most usefull thing I've dug out of the trash is my audio amp (Which is a total piece of crap, but good enough for me). Atleast it gets the most use, daily in fact, much to the irritation of my neighbors... I got all my speakers from people who would have otherwise thrown them away, so I guess they count too.
Also, I got my first proper soldering iron from the trash. It was a Weller with a dark red/brownish handle (I'm sure everyone has seen one of those). The power cord had melted, apparently from the iron resting on it while it was plugged in. I replaced the cord and it worked like a dream.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
That's like asking for a favourite piece of music: answers vary with time, and mood, and experience.
But TODAY, my fave rave is a 10v-0-10V 100A transformer in lovely condition.
All my anxieties about not being able to supply adequate heater current to my Rubenesque valves and thyratrons were gone in a flash. Gone forever is that heart-sinking feeling of personal inadequacy that would come over me when poring over some valve data sheet, and seeing that 10V at 50A of heater current would be required if ever the valve were to be brought back to life. The days of having to avoid other experimenters for fear of having to admit that I would be hard-pushed to do more than supply 6.3V/4A to my heaters are over. Years of secret misery were washed away in a flash courtesy of the Apex Transformer Co of New Delhi! I could look women in the eye once more, I could search out valves with such huge heater currents that only the genius and the madman would ever think of using them, and felt so good with my salvaged transformer that I even polished the brass carbide lamp on my bicycle.
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
Harry wrote ...
That's like asking for a favourite piece of music: answers vary with time, and mood, and experience.
But TODAY, my fave rave is a 10v-0-10V 100A transformer in lovely condition.
All my anxieties about not being able to supply adequate heater current to my Rubenesque valves and thyratrons were gone in a flash. Gone forever is that heart-sinking feeling of personal inadequacy that would come over me when poring over some valve data sheet, and seeing that 10V at 50A of heater current would be required if ever the valve were to be brought back to life. The days of having to avoid other experimenters for fear of having to admit that I would be hard-pushed to do more than supply 6.3V/4A to my heaters are over. Years of secret misery were washed away in a flash courtesy of the Apex Transformer Co of New Delhi! I could look women in the eye once more, I could search out valves with such huge heater currents that only the genius and the madman would ever think of using them, and felt so good with my salvaged transformer that I even polished the brass carbide lamp on my bicycle.
What about a re-wound MOT for 10V 50A?
Also, I rummaged through the junk pile and found another UPS board with lots of decent caps, inductors, and a few (probably working) FETs. Nothing as amazing as some of the stuff you guys have salvaged though.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Harry wrote ...
All my anxieties about not being able to supply adequate heater current to my Rubenesque valves and thyratrons were gone in a flash. Gone forever is that heart-sinking feeling of personal inadequacy that would come over me when poring over some valve data sheet, and seeing that 10V at 50A of heater current would be required if ever the valve were to be brought back to life. The days of having to avoid other experimenters for fear of having to admit that I would be hard-pushed to do more than supply 6.3V/4A to my heaters are over. Years of secret misery were washed away in a flash courtesy of the Apex Transformer Co of New Delhi! I could look women in the eye once more, I could search out valves with such huge heater currents that only the genius and the madman would ever think of using them, and felt so good with my salvaged transformer that I even polished the brass carbide lamp on my bicycle.
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.
Whats the most useful item you've salvaged?
