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Hi all I'm thinking of building a vttc sometime in the future when I get a fuw of my other projects finished but I have never used tubes before so I don't now what to look for dos anyone have any suggestions for god tubes (it will probably get one from ebay I just don't now what to look for)
Registered Member #4953
Joined: Sat May 19 2012, 11:56PM
Location: Australia
Posts: 12
Hey Destroyer, I've just recently gone through this learning curve and found the following tubes on eBay and worthy of consideration:
811A - Commonly used for small projects. Good watts per buck ratio. 572B - Same form factor to 811A but rated for more power. Costs around double. 833A - A common larger sized tube. Plenty of existing projects to copy. GU-5B - Handles up to 3.5KW and doesn't cost much more than an 833A, but the filaments are power hungry.
Also Check out: DA42, GU-81M and the GMI-7.
There are of course zillions of other options out there and it all comes down to your goals, budget and inventory.
I'll be interested to see which tubes other members suggest.
Thanks megabit I will keep an eye out for those do you now of any that are good for hfvttc's or are the ones you mentioned alright? I now the gk71 is alright but the chepest I could find it for was $35 unknown condition How much can I expect to pay for a good tube
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
There are hundreds of tube types which work well for a VTTC and are still relatively common. Any transmitting tube with a plate disspation of a few hundred Watts will work.
Registered Member #4953
Joined: Sat May 19 2012, 11:56PM
Location: Australia
Posts: 12
Cool I hadn't considered the GK71, It looks similar in power to the 572B but it's a pentode which adds a little complexity, you could copy (and downscale) any GU-81M coil which is a more commonly used pentode in VTTCs. I think almost any transmitting tube will handle tesla coil frequencies into the MHz. The tube data sheets often specify what plate voltage you can run at high frequencies, but you'll probably end up tuning for maximum smoke regardless of what's in the data sheet.
As for price, you can pick up a new Shuguang 811A for around $25 delivered off ebay (datasheet), or you could try RFParts.com for a Taylor 811A which is supposedly better quality IF you can get a response from them. I've sent 3 emails asking about 572Bs and had no response, so I ended up buying crappy shuguang tubes from eBay.
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what tubes work best in vttc's
