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Registered Member #316
Joined: Mon Mar 13 2006, 01:30PM
Location: Marietta, GA
Posts: 212
A nice way to make a filament supply is to knock out the shunts (metal laminations between the primary and secondary) and wind your own filament supply in the extra space. This can make your coil much lighter and more compact. However, you will need to make a way to switch the HV on and off so that you can heat the filaments before running the coil.
Registered Member #139
Joined: Sat Feb 11 2006, 11:01AM
Location: Perth, Western Australia
Posts: 358
Funky wrote ...
A nice way to make a filament supply is to knock out the shunts (metal laminations between the primary and secondary) and wind your own filament supply in the extra space. This can make your coil much lighter and more compact. However, you will need to make a way to switch the HV on and off so that you can heat the filaments before running the coil.
I was wondering about the filament supply, and was thinking of how I could "Warm up the set" before I hit the filaments with thousands of volts of goodness. This gives me an ideal way. I like the variac idea, but I want a very compact unit in a small hardwood box with just the essentials (including tubes) showing. I want a museum quality piece. When I actually get it all lashed up and running, I'll ditch the variac and try for a soft start circuit to turn on both the HV and filament circuits after a predetermined time to allow correct warm up. I'd prefer to stay away from anything that isn't era as well, and I have a few other tubes here, so I'll see what I can knock up. No 555's, no MOSFETs. Need to find some vintage gauges and switches now as well.
All this talk about Purdy coils makes me want to build another one.
I make most of my projects from Lexan, it is as easy to work with as wood and you can see the guts of the coil. The wiring needs to be organized well though to achieve "Purdy".
Here is my VTTC, not so Purdy but it is basically a test bed for the next one, and the next...
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First VTTC!
