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Registered Member #286
Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399
Wow, this thread is old and dusty just like my micro VTTC. I just found a 6146 tube at the farmers market for 2$. When I get time, I want to redesign the tube oscillator for the 6146 and build a new primery and secondary coils. Maybe I will have better streamers. The new tube only uses 50ma more heater current then the 6BQ6GTB so I can use the same SMT filament supply. Anyone else attemted to finish their coils or did they gave up when I had submitted mine?
Registered Member #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
I'm currently working on a nice cased up plasma tweeter, all tube minus the voltage doubler diodes. Winding my own transformer for ~250V to go into the doubler on a ~200W core. I'll be using a EL519 tube (once i find one) but everything is all wired, waiting for magnet wire for the secondary of the power transformer. Its actually Ulrich Haumann's design, which i have heard great things about. The other tubes include a EF86, and a ECL82 for the preamp and modulating tubes. Can't wait to get the wire and the EL519 or 6KG6A!
Registered Member #286
Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399
I finished my new secondary for the micro VTTC. It has arout 600 turns of 40awg wire on a 2cm former. With the topload, it resonates around 1.9Mhz. The primary is temporary. I believe this is all I can get out of the 6BQ6GTB.
Registered Member #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
I see that you're too cheap to buy actual plate caps for the tubes, too I know they're pretty cheap, but when you have to buy them and add 4 times their cost in shipping, I'd rather just buy a brass strip and form it. I think the best part of the coil is the SMPS! Can't wait to get one more tube to get my tweeter up and running!
Registered Member #286
Joined: Mon Mar 06 2006, 04:52AM
Location:
Posts: 399
The "worlds most smallest" VTTC is done! I have desided to keep the 6BQ6GTB because I do not want to redesign and etch the HV board again and the 6146 has a bigger footprint.
"I see that you're too cheap to buy actual plate caps for the tubes, too" I used an aluminum video wire clip found in a monitor. It fitted the tube's nipple so I used it.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Beautiful. There have been many great contributions, but I think your coil is a step above the rest. If Vaxian still lurks around here maybe you'll get the trophy he promised... Now can we finally close this thread?
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How small can a VTTC be?
