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vttc idea

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jake3085

Sun Jun 24 2012, 11:56AM

Registered Member #4800 Joined: Wed May 09 2012, 04:23AM
Location:
Posts: 39

hello people

im just wondering if this would work and if it would have any advantages and disadvantages. im just curious as to if this would work and don't want to try it until i know it will work cause i don't want to kill my gu 81m that im getting soon cause i spent most my money on it, one thing i think would be good about this design is i could make the feedback and primary 2 vary in distance to change the frequency. and what would happen if i put some ferrite in between primary 2 and feedback.

don't laugh at the poorly made schematic i made it on paint :)

one thing i forgot to add is the pic of the secondary coil

thanks jake3085

Dr. Dark Current

Sun Jun 24 2012, 02:28PM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

Hi,
the circuit will not work as you drew it. It might work when you put the tank capacitor (1 nF) across both "primary" coils.

PS. The 500pF RF bypass cap is too small, use ~2nf. Connect all 3 grids together, this way you get more power. Use at least 25 watts for the grid leak resistor, better 50 watts.

PS2. A flat primary coil is very bad for a VTTC, use a solenoid coil with a relatively high coupling (aroud 0.2-0.3).

jake3085

Sun Jun 24 2012, 02:51PM

Registered Member #4800 Joined: Wed May 09 2012, 04:23AM
Location:
Posts: 39

Dr. Dark Current wrote ...

Hi,
the circuit will not work as you drew it. It might work when you put the tank capacitor (1 nF) across both "primary" coils.

PS. The 500pF RF bypass cap is too small, use ~2nf. Connect all 3 grids together, this way you get more power. Use at least 25 watts for the grid leak resistor, better 50 watts.

PS2. A flat primary coil is very bad for a VTTC, use a solenoid coil with a relatively high coupling (aroud 0.2-0.3).

Thanks ill do everything you said to do exept the resistor wattage cause 10w is the biggest i can buy :( and the flat coil was just there wen i took the pic im not going to use it :)

Dr. Dark Current

Sun Jun 24 2012, 03:02PM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

Then just buy 4 pieces of the resistors and connect them in a "2x2" configuration.

PhilGood

Sun Jun 24 2012, 06:26PM

Registered Member #3806 Joined: Sat Apr 02 2011, 09:20PM
Location: France
Posts: 259

Hello Jake :)
What advantage do you expect from this setup compared to traditional setup ?

jake3085

Mon Jun 25 2012, 01:05PM

Registered Member #4800 Joined: Wed May 09 2012, 04:23AM
Location:
Posts: 39

PhilGood wrote ...

Hello Jake :)
What advantage do you expect from this setup compared to traditional setup ?

nothing really i just wanted to try something different. i could just go ahead and try it wen i get my gu 81m, but i dont want to risk breaking my valve so i thought id ask you guys if its safe to do without breaking anything :) and what would happen if say i put some ferrite in side the primary and feedback coil? (im just really curious about this stuff, but dont want to, like i said, try anything im unfamiliar with until someone that knows more than me says its safe to do)

Thomas W

Mon Jun 25 2012, 01:35PM

Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
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Posts: 1276

im probibly wrong but from what ive seen valves are rather hard to break as long as you use common sence, apparently they are rather forgiving.
then again, this is coming from a person who is still waiting for their first tube to arrive ^_^

jake3085

Mon Jun 25 2012, 01:56PM

Registered Member #4800 Joined: Wed May 09 2012, 04:23AM
Location:
Posts: 39

Tom Williamson wrote ...

im probibly wrong but from what ive seen valves are rather hard to break as long as you use common sence, apparently they are rather forgiving.
then again, this is coming from a person who is still waiting for their first tube to arrive ^_^

Yeah im waiting on my second valve. my last ones fillament blew and im unsure why. i was using the perfect voltage for it but it just decided to die i fink it was fulty but im not sure so i just try to be carefull with them lol

PhilGood

Mon Jun 25 2012, 05:03PM

Registered Member #3806 Joined: Sat Apr 02 2011, 09:20PM
Location: France
Posts: 259

It's a good way of thinking

Beeing curious, trying new circuits is a way to discover new setups...

And as Tom said in a previous post vacuum tubes are rather strong and allow for some deviations as long as one remains within reasonable limits.

For example, have a look at this special setup:

it seems really interesting ^^

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