Pyrazo Device

[SpongeDave]

http://www.pyrazo.com/

[ChrisW]

Okay David, you have my curiosity piqued. A few questions/thoughts:

1. Why tubes? Who uses tubes anymore? 
2. Given #1, can you sketch up a new schematic showing the connections using transistors?
3. Kudos on the positive feedback scheme. 
4. Have you actually built this thing?

I see potential here (pardon the pun  ), especially with multiple stages. A transistor-based schematic would be much appreciated.

Best regards,
Chris

[jadaro2600]

There seems to be a schematic or two on the website.

[lumen]

I don't know much about tubes, but don't the electrons flow from the element with the heater?

Should be able to substitute field effect transistors for the tubes?

[ChrisW]

I guess my real question is what's turning on the base of the transistors -- unless they're tied to the collectors and ground via some biasing resistors. 

Chris