What is the most powerful vacuum tube ever made?

upsidedown@downunder.com <upsidedown@downunder.com> wrote:
> On Sat, 4 Aug 2018 23:29:23 -0500, "Tim Williams"
> <tiwill@seventransistorlabs.com> wrote:
>
>>Largest continuous duty, that's relevant to your application (i.e. not RF) 
>>is the 8974, 1.5MW plate dissipation.
>
> RF tubes are OK as long as you can amplitude them.

Those RF power tetrodes have no problem with amplifying audio.
This is only an issue with resonating tubes like klystrons, magnetrons etc.

upsid...@downunder.com wrote:

> 
> 
> Much of the 50/60 Hz hum problem is/was due to grounding practices,
> especially with stage equipment.
> 
> - unbalanced signal connections were used
> - the signal ground in each device was directly connected to chassis
> - PE and N connected together into PEN in each mains socket ((TN-C)
> (- SCR controlled stage lights connected to same mains feed, same PEN)
> 
> Fixing these problems helps solve a lot of hum problems on 50/60 Hz,
> so why not on 400 Hz.
> 
> I admit that the ear is much more sensitive on 400 Hz than on 50/60
> Hz, so more care is needed.
>

** Annoying hum heard in live sound systems is at *many times* the local supply frequency. Typically a sharp buzz rather than a deep sine wave.

Radiation hum from nearby supply transformers into sensitive circuits like tape players and graphic eqs are only fixed by re-location of equipment - sometimes only a couple of rack heights ( 1.75 inches) does the trick.


....    Phil

On 06/08/2018 03:27, Mike Coon wrote:
> In article <mQw9D.1980280$nr7.1461286@fx31.am4>, lugnut808
> @spam.yahoo.com says...
>>
>> I can't find it now, but I saw on youtube someone detecting
> significant
>> amounts of xrays from a vacuum tube at 5kV. I think the problem is that
>> most detectors are insensitive to low energy xray photons so people
>> think there is no emission, but depending on the glass envelope, there
>> might be, it is just hard to detect apart from by waiting for it to
>> disrupt your DNA. Below 5kV there are definitely xrays within the vacuum
>> tube, the question is whether or not they can get out. I would certainly
>> suggest being very careful at even 5kV, and don't trust you xray
>> detector to work for low energy xray photons, unless you have a good
>> reason to.
> 
> It should be easy to detect ionising radiation with an electroscope, and
> it is easy to build a cheap one of those.I remember doing it myself as a
> student, but I did have access to fine metal film, though not actually
> gold leaf.
> 
> Mike.
> 

Yes, some sort of ion chamber should be ok too and maybe less hassle to 
use. There are some designs on Charles Wenzel's site. But, some youtube 
xray hobbyists use a metal envelope geiger counter that might be very 
insensitive to <20keV photons.

On 06/08/2018 04:06, 698839253X6D445TD@nospam.org wrote:
> Mike Coon wrote:
>> It should be easy to detect ionising radiation with an electroscope, and
>> it is easy to build a cheap one of those.I remember doing it myself as a
>> student, but I did have access to fine metal film, though not actually
>> gold leaf.
>>
>> Mike.
> 
> I have a few pen type radiation detectors like that,
> you charge the (electrometer) by pluggin it in into a unit,
> then put the pen in your pocket.
> At the end of the day you read the electroscope through a small window with a scale
> in the pen to see how much radiation you have been exposed too.
> Payed 10 Euro for the set.. Army surplus.
> Really nice stuff.
>   http://217.120.43.67/nuclear/radiation_pen_IMG_6534.JPG


I have one of those, and the full scale is about 1/10th the lethal dose. 
I guess it might be useful in a nuclear war.

Chris Jones wrote:

>On 06/08/2018 04:06, 698839253X6D445TD@nospam.org wrote:
>> Mike Coon wrote:
>>> It should be easy to detect ionising radiation with an electroscope, and
>>> it is easy to build a cheap one of those.I remember doing it myself as a
>>> student, but I did have access to fine metal film, though not actually
>>> gold leaf.
>>>
>>> Mike.
>> 
>> I have a few pen type radiation detectors like that,
>> you charge the (electrometer) by pluggin it in into a unit,
>> then put the pen in your pocket.
>> At the end of the day you read the electroscope through a small window with a scale
>> in the pen to see how much radiation you have been exposed too.
>> Payed 10 Euro for the set.. Army surplus.
>> Really nice stuff.
>>   http://217.120.43.67/nuclear/radiation_pen_IMG_6534.JPG
>
>
>I have one of those, and the full scale is about 1/10th the lethal dose. 
>I guess it might be useful in a nuclear war.

Yes, also known as nuclear war detector.
I have a bigger one too, with some ionisation chamber, that runs on a 1.5V D cell.
But these pens are plated with real gold!!!
Could not leave it there.
Then I have real GM counters, and a gamma spectrometer.
And know how to duck under the table in case the bomb goes off.
Nothing to worry about :-)

On 08/06/2018 05:36 AM, Phil Allison wrote:
> upsid...@downunder.com wrote:
> 
>>
>>
>> Much of the 50/60 Hz hum problem is/was due to grounding practices,
>> especially with stage equipment.
>>
>> - unbalanced signal connections were used
>> - the signal ground in each device was directly connected to chassis
>> - PE and N connected together into PEN in each mains socket ((TN-C)
>> (- SCR controlled stage lights connected to same mains feed, same PEN)
>>
>> Fixing these problems helps solve a lot of hum problems on 50/60 Hz,
>> so why not on 400 Hz.
>>
>> I admit that the ear is much more sensitive on 400 Hz than on 50/60
>> Hz, so more care is needed.
>>
> 
> ** Annoying hum heard in live sound systems is at *many times* the local supply frequency. Typically a sharp buzz rather than a deep sine wave.
> 
> Radiation hum from nearby supply transformers into sensitive circuits like tape players and graphic eqs are only fixed by re-location of equipment - sometimes only a couple of rack heights ( 1.75 inches) does the trick.
> 
> 
> ....    Phil
> 

"Bad Ground"

<https://www.youtube.com/watch?v=H09Mos2HLl8>

I wrote
>Payed 10 Euro for the set.. Army surplus.
>Really nice stuff.
> http://217.120.43.67/nuclear/radiation_pen_IMG_6534.JPG

Here some more pictures,
The set, real gold plating!
the socket top right is where you plug in the pens to charge the electrometer.
 http://217.120.43.67/nuclear/dosi_meter_PP-4127_IMG_3747.GIF

The circuit diagram, glued on the inside, really cool!
 http://217.120.43.67/nuclear/dosi_meter_PP-4127_circuit_diagram_IMG_3737.GIF

The inside, even a spare bulb!
The bulb provides light so you can read the scales in the pen,
reading the pen against daylight works too.
 http://217.120.43.67/nuclear/dosi_meter_meter_PP-4127_measurement_and_reset_unit_IMG_3734.JPG

In the words of the late Steve Brown "Let's stop fistfucking around here and do it".

So make your own tube. I was thinking for the plate - a cement mixer. Chain link fence for a grid. Not sure about the cathode, whether to heat it with a LASER or acetylene. 

Then you need to go to the nastiest bar in town and find some "boosters" who are people who will "obtain" things for you. Tell them to get you some of the transformers off the poles. 

Then you take your pee wee 5,000 watt per channel amp and a transformer to drive the grids of the REAL output stage. 

And don't worry about the missing transformer off the pole, make this thing run off 16 Kv directly. (or whatever voltage it is)

jurb6006@gmail.com wrote:
> In the words of the late Steve Brown "Let's stop fistfucking around here and do it".
> 
> So make your own tube. I was thinking for the plate - a cement mixer. Chain link fence for a grid. Not sure about the cathode, whether to heat it with a LASER or acetylene.
> 
> Then you need to go to the nastiest bar in town and find some "boosters" who are people who will "obtain" things for you. Tell them to get you some of the transformers off the poles.
> 
> Then you take your pee wee 5,000 watt per channel amp and a transformer to drive the grids of the REAL output stage.
> 
> And don't worry about the missing transformer off the pole, make this thing run off 16 Kv directly. (or whatever voltage it is)
> 

Heck, why stop at 16 kV? Tubes from these guys can run at 500 - 1200 kV:

https://www.slideshare.net/JohnKappenman/electron-tube-afs-epri-r5

jurb6006  wrote
>In the words of the late Steve Brown "Let's stop fistfucking around here and do it".
>
>So make your own tube. I was thinking for the plate - a cement mixer. Chain link fence for a grid. Not sure about the cathode,
>whether to heat it with a LASER or acetylene. 
>
>Then you need to go to the nastiest bar in town and find some "boosters" who are people who will "obtain" things for you. Tell
>them to get you some of the transformers off the poles. 
>
>Then you take your pee wee 5,000 watt per channel amp and a transformer to drive the grids of the REAL output stage. 
>
>And don't worry about the missing transformer off the pole, make this thing run off 16 Kv directly. (or whatever voltage it is)

Long ago, in this group, same question was asked,
maybe by same OP?
Anyways same idea as you now come with was brought forward,
and I then proposed to heat the cathode with hot plutonium.

Maybe google still has it, otherwise I could search my own database for it.

OP is just a troll.