Tubes?

[z_p_e]

BEP,

Have you seen this page? (Very good overview of switching tubes of all kinds).

http://www.electricstuff.co.uk/pulse.html

He seems to have specs and is perhaps selling some as well. Might be "overkill" though.

Also, download this book if you haven't already:

http://www.pmillett.com/Books/henney_industry.pdf

Darren

PS. I also came across some info on my hard drive that showed a "small type" of thyratron is a FG-57 or FG-67.

[innovation_station]

hello all it might be time to go diggin to find out exactly what tubes sm used and where he used them well we know he used the 6bq7a as a phase invertor and maybe just a pair of them to send and invert i will start looking and c what i find

ist
im sure there many tubes out there that can do things to help this project but we should use exactly the tubes sm mentions he says those spicific tubes for a reason the question is why?

ok well i read the important info all agin and we have missed much so far there is still much to be covered

but the tubes he says he got the idea from are the ones turbo is playing with but he does not use those tubes

he uses only 2 dubble triodes or to simplfly it 4 single triode tubes so what kind of osc/phase invertor  can we make with 4 triode tubes 


here is a picture of the tube i got a week or so ago i beleave it is the 1 sm said he used in his tpu  i paid 5 bucks for it

[BEP]

The basic radio hoag jpg ist wrong.

+ Batt is directly connected over the Coil (L1) to the ground (-B) so that this an "shorted" Voltage .
This L1  mus be powered  from +Batt
the way that connection are :
+ Batt - L1 - Tube Anode.

L2  -Batt - L2 - G1   ist OK.

Usually for L1  is used L1 with (varible) or fix condensor in paralell ,
this way to have an fix and constant frequeny.
(do not forget the heater voltage additionalle.)

Pese
www.stormloader.com/members/pese/fe/index.html

No, it isn't. It worked quite well. It is no more a short than a solenoid coil is a short. While I am quite sure you know far more than I about valves, I have had this circuit running.

Capacitance across the coil is to be avoided. The reason is the resonance needed is that of the core not the coil. You'll notice the two coils on the core are counterwound. When power is applied the core coils drop the majority of the voltage, the grid starts as negative and prevents tube conduction.
As voltage stabilizes across the coils the grid swings positive. This causes the tube to conduct and the B+ inductor to drop the majority of the voltage. As core flux decreases the grid swings more negative and starts the whole process over again.

This oscillator will produce very high amplitudes at incredibly low frequencies. The harmonics generated are almost always super-sonic and so are the movements of the core. A multivibrator or push-pull version of this circuit on a Maxwell coil easily produces spherical field rotation.

A garden variety tube will not handle the sinking current ability. A trigger tube may be more appropriate. The coils on such a device must be a very high turn count because a good DC resistance is needed compared to the tube + B+ inductor resistance. The object is to -constrict- the core and cause movement of the core within the grid coil end.

To that end - The core must be of good magnetostictive material or stranded/multi-element - as in speaker wire or bundles of 16 ga. iron wire.

Yes, heater voltage must be considered - if you are using a 'hot' cathode. Even if you are, another fixed coil (fixed allowing movement of the core within) at the grid end of the core should provide enough AC to heat the filament.

[Super God]

Something weird I noticed, probably insiginificant or something.  But on all of my coils with NOTHING attached at all, show zero voltage and a flat line across the scope.  I have 3 control coils per collector and three collectors.  Now, when I add my bias coil, it is wound all the way around and back again, it shows little spikes for some reason?  I don't get these with any of the other coils, but only this one.  Maybe nothing, just something I noticed.

[turbo]

Hi God 

Do they look like this?
Then they are NOT insignificant.