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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Well the circuit is always the same. For the most efficient VTTC you use a class C oscillator. If you give me your input data (tube you want to use, desired output, any other info) I will design a circuit for you. If you want to translate the text anyway, I can do it for you, but it will take a while and I don't have much extra time now.
Registered Member #1412
Joined: Thu Mar 27 2008, 04:07PM
Location: Taipei Taiwan
Posts: 278
I build a VTTC with 6146B as seen in my previous post but it didn't work.So I want to try the circuit and want to know the specification of the primary/secondary coil .I can find cheap 6L6 or 807 matched pair.
Which will work better?one 6146B or two 6L6/807? Or can you tell me whats wrong with my 6146B coil?
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
As for your coil, Do you have a sharp break out point on it?
1. Put a 100 uF capacitor in the doubler, 2.2 uF is way too low. 2. What is your secondary resonant frequency? From this we'll calculate the optimal tank cap value. Assuming 600 kHz for now, the tank cap should be in the 3-4 nF range. 3. Put taps on the primary coil and tune !! You can't expect the coil to work properly if you wind any number of turns. What is your primary coil dimensions? From this we'll calculate the inductance and the approximate turns where you should try the tuning. 4. The number of turns on the grid coil should be approximately the same or slightly less than the primary. Putting taps on it doesn't hurt either. 5. Scoping the cathode current throught a shunted CT helps the tuning greatly.
Registered Member #1412
Joined: Thu Mar 27 2008, 04:07PM
Location: Taipei Taiwan
Posts: 278
Dr. Kilovolt wrote ...
As for your coil, Do you have a sharp break out point on it?
1. Put a 100 uF capacitor in the doubler, 2.2 uF is way too low. 2. What is your secondary resonant frequency? From this we'll calculate the optimal tank cap value. Assuming 600 kHz for now, the tank cap should be in the 3-4 nF range. 3. Put taps on the primary coil and tune !! You can't expect the coil to work properly if you wind any number of turns. What is your primary coil dimensions? From this we'll calculate the inductance and the approximate turns where you should try the tuning. 4. The number of turns on the grid coil should be approximately the same or slightly less than the primary. Putting taps on it doesn't hurt either. 5. Scoping the cathode current throught a shunted CT helps the tuning greatly.
I already use a nail as a breakout point.It is difficult to find in the photo.
The primary.secondary and resonant capacitor is taken from my working 811A VTTC.
How can I measure resonant frequency to confirm the calculation?How to build a CT?
probably it is better to reply me in my 6146B coil thread because this is off topic here.
Registered Member #1412
Joined: Thu Mar 27 2008, 04:07PM
Location: Taipei Taiwan
Posts: 278
Dr. Kilovolt wrote ...
As for your coil, Do you have a sharp break out point on it?
1. Put a 100 uF capacitor in the doubler, 2.2 uF is way too low. 2. What is your secondary resonant frequency? From this we'll calculate the optimal tank cap value. Assuming 600 kHz for now, the tank cap should be in the 3-4 nF range. 3. Put taps on the primary coil and tune !! You can't expect the coil to work properly if you wind any number of turns. What is your primary coil dimensions? From this we'll calculate the inductance and the approximate turns where you should try the tuning. 4. The number of turns on the grid coil should be approximately the same or slightly less than the primary. Putting taps on it doesn't hurt either. 5. Scoping the cathode current throught a shunted CT helps the tuning greatly.
I already use a nail as a breakout point.It is difficult to find in the photo.
The primary.secondary and resonant capacitor is taken from my working 811A VTTC.
How can I measure resonant frequency to confirm the calculation?How to build a CT?
probably it is better to reply me in my 6146B coil thread because this is off topic here.
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Can someone translate this?
