Tubes?

[innovation_station]

well back to the tubes just had to show what can be done with some magnets and 12 volts

im winding my last gk4 ring it will be all steel gk4 4" model

i gave up on the vid of the magnets inside the ring because it is just too hard to keep it kickin bigtime and shoot the vid but try it if you all have some time

when i play with that setup it makes me think off and on's are the tpu way

is

[orbs]

There are also some excellent old books about tubes on Radau5's Vacuum Tube Site, both in English and German. I've put all the PDFs in a Zip file for easier download [87 MB].
Many more links can be found in the diyAudio Forum Tube Learning thread (it includes a link to the Safety Practices thread that includes some really good advice about high voltage -- however, you might not want to read it just before going to bed...).

[innovation_station]

 

hello all sorry but it seams i forgot to post the best vid with the magnet inside the ring in this vid you can see my mag spark gap in the ring and on my scope you see square waves with big leading spikes 






is

[Jdo300]

Hello Everyone,

Does anyone know of any good sine wave oscillator circuits that use a pentode like the 6AU6? I'm working on building the tube stage to connect to the power supply I just made (http://www.overunity.com/index.php/topic,712.msg44432.html#msg44432) and I want to experiment with function generator-driven tubes, and oscillator circuit-driven tubes. Any help would be greatly appreciated.

God Bless,
Jason O

[Mannix]

Jason, an all

google "hartley oscillator"...very clean ..easy to

i have used triodes put pentodes are almost the same.

I have also made some blocking oscillators..spikey!


You really wont need a circuit once you get started just bias the thing and add l,c

You can think of them as a high voltage transistor that needs its grid(base) biased negative with respect to the cathode (emitter).

they do not fully conduct in the conventional sense and they dont blow up!


theres lots of old info on them..

it is great that you are on this path .if any body is thinking about it is a good time to begin.

just find some old tube equipment and you will most likley have  everything that you need.

Lindsay