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Re: [TCML] First VTTC - Some help needed choosing tubes

Neat little coil there, John!
Your inverter supply is certainly intriguing. I might have to explore that later on, but I probably won't start with that right away. I figure I'll begin with designs that are tried and true (with only minor tweaks as needed). I did read that graphite coated plates greatly increase lifespan and capabilities. I'll keep my eyes open for those as well, though I'm about ready to pull the trigger on a GU-81M. 
Matt, Fairlee VT

-----Original Message-----
From: Futuret via Tesla <tesla@xxxxxxxxxx>
To: tesla <tesla@xxxxxxxxxx>
Sent: Thu, Dec 27, 2018 2:41 pm
Subject: Re: [TCML] First VTTC - Some help needed choosing tubes

Here are some various tubes I've used for VTTC  projects.  I also showa completed small 4-125A  tesla coil project, with various notes.    

I also have some small 4" diameter toroids listed on ebay:

Also a couple of solid state power supplies that might work well to power a VTTCinstead of using an MOT.  I've always meant to try this, but I'll probably neverget around to it, so I listed them on eBay.  
Tubes with graphite plates such as the 810 can handle more than their ratedvoltage and power.  The HF-300 or HF-200 work well, for a VTTC.  Tubessuch as the 4-400A, 4-1000A, work well too.  I just tie the two grids together.I particularly like using the 833A or 833C (graphite).  There are a bunchof rarer tubes than can work well that look like an 810 and have graphiteplates.  Such tubes might sell cheaper since they are not popular.  Someexamples are:  EV-20, KU-23 (same as HF-300), HF-100 (a little smaller).
The 813 tubes tend to sell very cheaply and they work well also (graphite),they are tetrodes.  
I don't like the 811 or 812 tubes much because they are rather feeble in theiroutput power.  However the 572B is stronger but can only withstandlimited voltage.  Yes, the 304TL (or TH) are interesting tubes.  I've alsoused the 3-500Z.  
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