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mr. ed

Amarillo, Texas

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Posted: 12/16/20 09:40am Link  |  Quote  |  Print  |  Notify Moderator

wa8yxm wrote:

Speaking of 2nd Anode (And high power broadcast (And ham) transmitters) one Station engineer I Know has what he calls a "Jesus Stick"

Now as it happens I know (From observation not personal expierence) Where that name comes from

IT's a well insulated handel on a rod that's connected to ground

You poke around the high voltage parts and if one is still hot.. Well

OH JESUS is a common exclamation! when you find a fully charged capacitor.

True story
Two Radio engineers one legally blind (has only side vision can not see straight ahead) The other one opens a cabinet.. Thinking it was the Audio Cabinet (nothing dangerous in there) Turns out it was the High Voltage cabinet.

Two brass bars one firmly connected to ground and you can guess what the other connected to. Block of porcelain between them hooked to the door. The top bar is free to fall onto the bottom bar when the door is opened.

Knocked out power to half of the Building (A Office tower)

Or as the stick is named OH JESUS
(Uh. Wrong door there Charlie?)

Though they do make thousand watt and multi-thousand watt Solid State Transmitters Tubes still rule in the multi-thousand stations.

There is a podcast (Ham nation) and a few years ago they have an episode I think it was title 1.2 Gigawatt or some such (the power of the Car that DeLorean tine travel series Back to the Future)

They show a multi thousand watt transmitter

Several episodes include "Tales from the transmitter site" (The aforementioned Radio engineer of Jesus Stick attribution) and he shows off one of the Transmitter tubes and of course his stick.


I used the same tool in my business servicing radio frequency dielectric sealers. I used it to discharge any stored high voltage in the machine before servicing since bleeder resistors often burnt out and became unreliable. If there was enough stored voltage the discharge sounded as loud as a gunshot and startled anyone in the vicinity, including me.


Mr. Ed (fulltiming since 1987)
Life is fragile. Handle with prayer.

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LScamper

Los Alamos NM

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Posted: 12/16/20 02:26pm Link  |  Quote  |  Print  |  Notify Moderator

Dad had a used furniture store. He paid me $1.00 to fix the old TVs. This was my shop when I was about 15 years old.

[image]
[image]Click For Full-Size Image.


Lou


LScamper

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Posted: 12/16/20 02:33pm Link  |  Quote  |  Print  |  Notify Moderator

In the Army worked on a Nike site. Was the computer operator. Analog computer used tube op amps and gears to calculate target intercept.

Pictures of a few of the op amps and one of the mechanical calculating units.

[image]
[image]Click For Full-Size Image.

[image]
[image]Click For Full-Size Image.

LScamper

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Posted: 12/16/20 02:38pm Link  |  Quote  |  Print  |  Notify Moderator

After Army worked on fusion energy experiment called Scyllac.

Specs:

[image]
[image]Click For Full-Size Image.

A few of the 60 kV, 1.8uf capacitors.

[image]
[image]Click For Full-Size Image.

Some of the racks of capacitors.

[image]
[image]Click For Full-Size Image.

LScamper

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Posted: 12/16/20 02:47pm Link  |  Quote  |  Print  |  Notify Moderator

In the mid 90s helped with the design of a 200 megawatt two channel amplifier. It used 12 ML8618 water cooled magnetically beamed triodes.

Some of one bank of tubes.

[image]
[image]Click For Full-Size Image.

Amplifier testing area.

[image]
[image]Click For Full-Size Image.

At one time while working on Scyllac we had an amplifier chain of 100 ML8618 tubes for a total output power of 2.5 Gigawatt. filament power was 32 kilowatt.

MrWizard

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Posted: 12/16/20 03:40pm Link  |  Quote  |  Print  |  Notify Moderator

Da*!#

Don't touch the wrong place, that's not a shock
That would be instant charcoal for any warm body that came into contact with it

Phase one create insane amount of power
Phase two attempt to channel it to the target point
Phase three interpret test results


I can explain it to you.
But I Can Not understand it for you !

....

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Thunder Mountain

Lost in the Four Corners

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Posted: 12/16/20 07:07pm Link  |  Quote  |  Print  |  Notify Moderator

Been watching this thread, but haven't had a chance to reply. We got our first TV in 1952 or '53 when I was three or four years old. My dad had a WWII friend who kept stuff flying and fighting. He transitioned to the new technology. I started watching him work on our televisions. One of the first things he did was look to see if the vacuum tubes were glowing.

When I was about ten or eleven our TV quit working. I took the back off the TV and looked around. I saw a tube that wasn't glowing. I pulled the tube and convinced my mother to take me to 7/11 which had one of those tube testers. Sure enough it was bad. The clerk pulled a replacement from the cabinet underneath.

When my dad got home from work the TV was working. He said to mother you called me at work and told me the TV wasn't working. Mother told him the story. After that thay gave me lots of things to fix.

I transitioned into computers in 1968... The rest is history. I still fix stuff that should be pitched.


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mr. ed

Amarillo, Texas

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Posted: 12/17/20 03:34pm Link  |  Quote  |  Print  |  Notify Moderator

LScamper wrote:

In the mid 90s helped with the design of a 200 megawatt two channel amplifier. It used 12 ML8618 water cooled magnetically beamed triodes.

Some of one bank of tubes.

[image]
[image]Click For Full-Size Image.

Amplifier testing area.

[image]
[image]Click For Full-Size Image.

At one time while working on Scyllac we had an amplifier chain of 100 ML8618 tubes for a total output power of 2.5 Gigawatt. filament power was 32 kilowatt.


WOW, that’s some gnarly equipment! Get near 2.5 gigawatts of RF and you may start cooking your insides, unless the energy was well contained. I know from servicing dielectric sealers, even being too close to the output of even a 10kw machine coul cause your feet to heat up uncomfortably. I could hold a fluorescent lamp in my hand and amazed the machine operators when it lit up brightly when the machine fired. They thought it was some kind of magic. [emoticon]

mr. ed

Amarillo, Texas

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Joined: 02/06/2002

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Posted: 12/17/20 03:42pm Link  |  Quote  |  Print  |  Notify Moderator

MrWizard wrote:

Da*!#

Don't touch the wrong place, that's not a shock
That would be instant charcoal for any warm body that came into contact with it

Phase one create insane amount of power
Phase two attempt to channel it to the target point
Phase three interpret test results


Be sure to wet fingers first before testing for any stored voltage! [emoticon]

mr. ed

Amarillo, Texas

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Posted: 12/18/20 08:11am Link  |  Quote  |  Print  |  Notify Moderator

LScamper wrote:

In the mid 90s helped with the design of a 200 megawatt two channel amplifier. It used 12 ML8618 water cooled magnetically beamed triodes.

Some of one bank of tubes.

[image]
[image]Click For Full-Size Image.

Amplifier testing area.

[image]
[image]Click For Full-Size Image.

At one time while working on Scyllac we had an amplifier chain of 100 ML8618 tubes for a total output power of 2.5 Gigawatt. filament power was 32 kilowatt.


Those wires are dangling mighty close to the tubes. They should have been routed more carefully, IMO.

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