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Registered Member #2318
Joined: Fri Aug 28 2009, 01:22AM
Location:
Posts: 33
I recently built my first VTTC following Steve Ward's schematic (found here) and it is working well.
My friend who has built coils for many years showed me an alternate circuit that uses a coupling capacitor between the plate and tank circuit (shown here)
Are there any distinct benefits to using my friend's design? What would be the pros of cons of doing it this way? I have an extra mica cap that I could use with this circuit but before I go to the trouble of rewiring my coil I am curious to see if anyone else has tried this way before and what the results were. Thanks!
Registered Member #2318
Joined: Fri Aug 28 2009, 01:22AM
Location:
Posts: 33
I actually omitted the level shifter from the first circuit so the way I'm using it it applies ac to the plate and everything is working fine. I guess the second one is the same.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
It looks like your friend has been building tube audio amplifiers, since he included a coupling capacitor / DC blocking capacitor. We do not really need to take so much care about a little extra plate dissipation in a VTTC, its quite the abuse to start with anyway :)
My VTTC built after Wards schematic and with some more details:
Registered Member #2318
Joined: Fri Aug 28 2009, 01:22AM
Location:
Posts: 33
This is the answer I was looking for! My friend is very oldschool and does not use the internet except for ebay sometimes, so you are probably right about where he got his circuit idea from.
Steve's circuit certainly works well!!! I was just curious about this variation. Thanks!
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Two variations of a VTTC circuit, which is better?
