Tubes?

[turbo]

@marco

i hope the red wires are your heater filament ,
if so , you can use ONE side of the heater wire to take the negative supply voltage out. (that include an small 2,5 Volt AC ripple voltage , if no C.T heater Transfo is
used , or special to eliminate this .
This is ONLY , IF YOU USE "DIRECT HEATED TUBES WITHOUT additional Cathode in in.
If you using Tubes with cathode  you must take the Negative Power from Cathode (never from filament wires !

The positve Voltage you will find on C.T from High-voltage Transformator. 
It is 100 (120) Hertz pulsed DC.
Gustav Pese

Hi Pese, it has only two cathode wires which is also heater in serials.

M.

[z_p_e]

i was just about to put the 500VDC directly on to the filament to see what it would do.

if there is no closed loop it cannot combine.
unless there is some sort of electrostatic coupling between the windings which can happen at high voltage.
it is the diffrence between two terminals and a closed loop ,and one hot terminal in an open circuit.

that is relevant because Steven says it travels through the coils of the htr transformer and combines with the 5VAC.
from the beginning of the experiment untill now i did not understand what he ment.

Marco.

Technically speaking, I suppose the HV plate voltage only goes through the filament secondary when it has a centre-tap, because this is where the output is taken from.

In the other case, the HV/B+ is tied directly to one of the filament secondary leads.

In both cases, the filament secondary floats with respect to the B+, so it should have little if any effect on the output.

Does that make sense?

However, the filament secondary lead connected to the B+ does have a relatively low impedance path to ground through either the LOAD, or the filter capacitors, or both.

I wonder if perhaps the only way we can have the 5VAC and B+ output combining in the filament secondary, is if it has a centre-tap?

Darren

[pese]

 .

[Mannix]

Hi all,

great discussion going on here .Untill we get to the bottom of the first clues...we should not go to far ahead so,
a good few hours a few experiments...then a thought came for a new direction..

what happens when we apply our high frequency to the filament?

what happens if we apply a few extra instant electrons to the cathode? rather than the grid? via the heater....mabey thats why a 12.6 heater is better...also it is centre tapped....there is so much to explore here.

I keep wondering about the reference to the morgan jones book and where,exactly to apply it to the tpu..perhaps we really need to examine the unconventional properties of these electron tubes...

Sometimes, when i think that I have explored something  i realize that all i have discovered is my own ignorance.
That is usually when i truly begin exploring.




Marco,
I always though of  the 5volt heater winding as"floating" and in series with the ht. Have a look at some complete "old" circuits to get the "convention" that some are referring to.

[turbo]

i was just about to put the 500VDC directly on to the filament to see what it would do.

if there is no closed loop it cannot combine.
unless there is some sort of electrostatic coupling between the windings which can happen at high voltage.
it is the diffrence between two terminals and a closed loop ,and one hot terminal in an open circuit.

that is relevant because Steven says it travels through the coils of the htr transformer and combines with the 5VAC.
from the beginning of the experiment untill now i did not understand what he ment.

Marco.

Technically speaking, I suppose the HV plate voltage only goes through the filament secondary when it has a centre-tap, because this is where the output is taken from.

In the other case, the HV/B+ is tied directly to one of the filament secondary leads.

In both cases, the filament secondary floats with respect to the B+, so it should have little if any effect on the output.

Does that make sense?

However, the filament secondary lead connected to the B+ does have a relatively low impedance path to ground through either the LOAD, or the filter capacitors, or both.

I wonder if perhaps the only way we can have the 5VAC and B+ output combining in the filament secondary, is if it has a centre-tap?

Darren

hi,
This would be the same situation as we would take one lead from the wall socket and connect it to one end of the primary of a transformer.
no current will flow untill the closed loop is made.

Normally it can only combine when the circuits are connected to each other on two points or more.
However, this can change with high voltage and resonance.
for example if we make the coil resonant to the pulsed frequency of the connected one wire high voltage connection.

In that case we would be tapping the wall socket by resonance and not by induction.

This is a bit of new and unknown territory to me and sometimes it is hard to understand.
I do not see the 500VDC on the filament because it will instantly destroy it.
I only see the "potential" on the coil of the htr and this means i will have to look for a resonant frequency...

Marco.