Argon Toshiba LHI-106D

[mixedgas]

"It is the supreme art of the teacher to awaken joy in creative expression and knowledge. "
Albert Einstein

~
I have not done any teaching in a year. I'm a bit rusty.
~
Enjoy..
~
Kind Regards,
~
Steve

[Methelina]

The Lexel Model 65 supply is air cooled. It uses 12 2N6259 to-3 cased passbank transistors on a "tunnel" heatsink cooled by two big fans. We have had some luck replacing 2N6259 by linear FET in TO-247 package, mounted close together to prevent thermal runaway, and cooled by water. I seem to remember from working on Lithuanian lasers that there was European / Russian NPN starting with BU part number from TV Horizontal Output that was even more capable then 2N6259. I know Sam changed the design to 2N3055, but that is not a great NPN in terms of C-E voltage, Vce0, 60V for 2n3055 against 250v for 2N6259. The idea is to never have more then 20-30 volts across the passbank transistors when the tube is lit. If that occurs, change transformer turns etc. Ideal situation is around 8-10 volts. At low currents the voltage across the passbank will be high. We always try to start the laser plasma at medium or high current to protect the transistors from start-pulse.

BU-208 in TO-3 or similar....???????

Steve

I have some BU208 at my old garage as I remember... Surely if my kind friends still do not stole'em all

---

"It is the supreme art of the teacher to awaken joy in creative expression and knowledge. "
Albert Einstein

~
I have not done any teaching in a year. I'm a bit rusty.
~
Enjoy..
~
Kind Regards,
~
Steve

Eheheh, i become first in the class? XD

---

And I mixed the idea from the ignition terminator from the boards you showed, but to use a manual pulse ignition like a series style ignition used in the soviet solid state lasers:


And I did something like that:


The manual switching let the cap with HV via ignition transformer go through the tube once to have a proper ionization.

What do you think, master?

[mixedgas]

Why switch to a series injection ignitor? That is a lot of extra engineering to find a core with correct magnetic properties. Is existing ignitor dead?

Usually SII needs big, fast, SCR or spark gap to achieve clean ignition. As well as extra boost voltage and often resonating capacitor on it's secondary. This is not Innova 300 or big monster from JSC Plasma. As much as I love series injection, it is overkill on a small Argon.



Steve

[Methelina]

Why switch to a series injection ignitor? That is a lot of extra engineering to find a core with correct magnetic properties. Is existing ignitor dead?

Usually SII needs big, fast, SCR or spark gap to achieve clean ignition. As well as extra boost voltage and often resonating capacitor on it's secondary. This is not Innova 300 or big monster from JSC Plasma. As much as I love series injection, it is overkill on a small Argon.



Steve

Ahhhh, does existing exists ))) the board situated over the cathode zone?!?!?

....whuh... I thought its kinda of a protection chain.......

[mixedgas]

That is ignitor

[Methelina]

That is ignitor

That's why i still feel self nuwbster XD

[Methelina]

In any case it's a good news, cuz less work over the board and parts.

[kecked]

Do you have a sister named ethelina
sorry could not resist. I’m a chemist.

[mixedgas]

Does the laser text have a name? Looks interesting. While my Russian is just a few words, I'd like to look at the graphs and pictures..

Steve


And I mixed the idea from the ignition terminator from the boards you showed, but to use a manual pulse ignition like a series style ignition used in the soviet solid state lasers:


And I did something like that:


The manual switching let the cap with HV via ignition transformer go through the tube once to have a proper ionization.

What do you think, master?[/QUOTE]

[Methelina]

Does the laser text have a name? Looks interesting. While my Russian is just a few words, I'd like to look at the graphs and pictures..

Steve


And I mixed the idea from the ignition terminator from the boards you showed, but to use a manual pulse ignition like a series style ignition used in the soviet solid state lasers:


And I did something like that:


The manual switching let the cap with HV via ignition transformer go through the tube once to have a proper ionization.

What do you think, master?

Sure, here it is:

• "PS for Lasers", 1980 Vakulenko, : 1 book
• "Nd-Glass SS Lasers", 1990: second one

If something special you need from them I can translate

---

Do you have a sister named ethelina
sorry could not resist. I’m a chemist.

Eheheh, no But the Hexamethylenetriperoxidediaminia