# I love vacuum tubes

#### KL7AJ

Joined Nov 4, 2008
2,229
Interesting history:

#### profbuxton

Joined Feb 21, 2014
419
I would too, if there was any thing in it!

#### KL7AJ

Joined Nov 4, 2008
2,229

#### Lestraveled

Joined May 19, 2014
1,946
The sound of Rock n Roll is based on the vacuum tube. With all of the engineering poured into it over the years, nothing replaces it.

#### nsaspook

Joined Aug 27, 2009
10,906
Most of my early shipboard technician life was spent working on vacuum tube technology equipment. I didn't love tubes then and I don't love them now. Try maintaining a room filled with 390 receivers, a tasks group src20 set or a spa-8 in the tropics with minimal or no AC in the room. Love is not the word I would use for that experience.

#### Glenn Holland

Joined Dec 26, 2014
703
Most of my early shipboard technician life was spent working on vacuum tube technology equipment. I didn't love tubes then and I don't love them now. Try maintaining a room filled with 390 receivers, a tasks group src20 set or a spa-8 in the tropics with minimal or no AC in the room. Love is not the word I would use for that experience.
It's a lot like the old fashioned elevators with mechanical selectors, relay logic and AC/DC motor generator sets.

They're fun to watch and listen to, but a pain in butt to whoever maintains and repairs them.

#### Hypatia's Protege

Joined Mar 1, 2015
3,226
I love vacuum tubes
So do I!

For the record --- Only at such time as EUV through 'hard' X-Rays (to at least 100 MeV) may be produced via semiconductor devices (composed of stable nuclides/isotopes) might one argue that electron tubes are wholly obsolete -- Then too, such indispensable (and ubiquitous) instruments as EMs, MSs and, indeed, all manner of particle accelerators, are, in essence, 're-entrant' electron tubes...

But here's a thought -- The Crookes tube (which being an experimental/demonstration CRT and X-Ray tube) is often cited as the earliest electron tube -- The irony (such that it is) being, inasmuch as a 'semiconductor realization' of the latter function is unlikely, that one is put in mind of the Bard's immortal line: "She, she at least, shall stand to the last even as she was first..." (Possible [proximate] paraphrase)...

Best regards
HP

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#### ISB123

Joined May 21, 2014
1,236
I hate Vacuum tubes but I love Nixie tubes.

#### nsaspook

Joined Aug 27, 2009
10,906
For the record --- Only at such time as EUV through 'hard' X-Rays (to at least 100 MeV) may be produced via semiconductor devices (composed of stable nuclides/isotopes) might one argue that electron tubes are wholly obsolete -- Then too, such indispensable (and ubiquitous) instruments as EMs, MSs and, indeed, all manner of particle accelerators, are, in essence, 're-entrant' electron tubes...
Tube are not obsolete but are (thank goodness) no longer general purpose devices for electronics.

I'm still the 'tube' guy.

#### #12

Joined Nov 30, 2010
18,224
Quote from some old guy disparaging transistors: "There is nothing a tube can do that 5 or 6 transistors can't do."
I assume he was thinking about a pentagrid converter.
I also assume he was wrong about high energy circuits. There is definitely a limit to how much voltage you can connect to the pins of a TO-220 package.

In reality, 5 or 6 transistors still require less power than a pentagrid converter.
And while I'm here, I would like to discourage people who say transistors don't wear out. They don't get low emission from their cathodes, but ECG and I made a living replacing transistors that failed.

#### KL7AJ

Joined Nov 4, 2008
2,229
Most of my early shipboard technician life was spent working on vacuum tube technology equipment. I didn't love tubes then and I don't love them now. Try maintaining a room filled with 390 receivers, a tasks group src20 set or a spa-8 in the tropics with minimal or no AC in the room. Love is not the word I would use for that experience.
I bench pressed a LOT of R-390s into racks....singlehandedly. And I STILL love them!

#### JoeJester

Joined Apr 26, 2005
4,390
Hey, they even made a phantastron oscillator using transistors. Of course the vacuum tube model was a pentode.

I remember lugging around those old Tektronix scopes.

#### Hypatia's Protege

Joined Mar 1, 2015
3,226
Tube are not obsolete but are (thank goodness) no longer general purpose devices for electronics.

I'm still the 'tube' guy.

Best regards
HP

#### nsaspook

Joined Aug 27, 2009
10,906
I bench pressed a LOT of R-390s into racks....singlehandedly. And I STILL love them!
I remember the (happy) day we junked all but a few of the R-390s and replaced them with the R-1051. (that still had two tubes LOL)

Maybe I worked too long in the Donut shop.

#### nsaspook

Joined Aug 27, 2009
10,906
I remember lugging around those old Tektronix scopes.
That scope cart was build like a tank. I still have a few at work converted to custom mobile test racks.

#### KL7AJ

Joined Nov 4, 2008
2,229
I remember the (happy) day we junked all but a few of the R-390s and replaced them with the R-1051. (that still had two tubes LOL)

Maybe I worked too long in the Donut shop.
I've installed those too! FINE FINE radio...the synthesizer rocked.