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Registered Member #2563
Joined: Mon Dec 21 2009, 10:17AM
Location: Australia
Posts: 280
What would be a good VT for a single VT "Beginners" VTTC Further more does anyone know of any half decent VTTC plans that use a single tube and aren't overly large? Thanks
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Teravolt Labs wrote ...
What would be a good VT for a single VT "Beginners" VTTC Further more does anyone know of any half decent VTTC plans that use a single tube and aren't overly large? Thanks
You should look for a triode tube, preferable with a plate dissipation around 100-300 watt, the heater atleast at some 20-30 watt and the higher voltage it can manage is good, but a few kV is best. Best get one in a glassenvelope so you can check plate heating while testing.
For the oscialltor, most uses a class c amstrong osciallator, its the one I have used in my vttc, for a single tube, just remove one of the two in my drawings f.ex.
good luck with your vttc, you should also read steve wards vttc faq for some good design guidelines,
Registered Member #1845
Joined: Fri Dec 05 2008, 05:38AM
Location: California
Posts: 211
Build Steve Ward's dual 811A off his site. This was my first VTTC. I built it exactly like his schematic and it worked the first time I powered it up, no problems. (well my grid feedback resistor got way too hot, but whatever)
Its a pretty easy build for a first VTTC.
(you don't have to use two 811A's though, you can just have one)
Registered Member #2875
Joined: Mon May 24 2010, 08:28AM
Location: England
Posts: 42
Oidium45 wrote ...
I don't know how reliable the list is but there is a list of "recommended" vacuum tube on this page.
I saw that list myself, not really very useful without more information on the individual valves. Does "recommended" mean "kinda ok" or " really very good"
Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
QUOTE: "Are these "brand new" chinese VT's worth trying?"
I don't want to down Chinese goods but there are too many quality older tubes out there for you to have to settle for a "knock off". I found plenty of them when I really started to look.
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Teravolt Labs wrote ...
Are these "brand new" chinese VT's worth trying?
It is funny you mention those...
I just dropped mine on the floor 2 times(once it fell and hit a hard plastic box then hit cement), and i got the heat bright red. It still works. That is a tough little thing...
They really have seemed to work well... I have had 3 in all, one broke because it rolled onto a cold steel ATX PSU lid about 2 and a half years ago, one is the one i am talking about, and one went to a friend. All that shipping and it still lights up
And yea, one was 14 bucks shipped, and the other two where 24 bucks shipped. Mmmm! And i have run them at 10MHz with no air cooling!
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First VTTC
