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Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

tubes with the best 'glow'
tubes with the best 'glow'
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Old 29th July 2019, 04:07 AM   #21
cabasse is offline cabasse  United States
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all of these pics are making me want to embark on a journey of building or acquiring a tube amp.

on a side note, does anyone know what these are? Dizayn Hoparlor on Instagram: “#pioneerpl51a #audiophile #hiend #jazz #blues #guitar #marantz #pioneer #sansui #jbll #ess #jbl #ar #klipchs #pioneersx #vintageturntable…” (posted bya content thief likely)
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Old 29th July 2019, 11:18 AM   #22
johnsurnamerobinson is offline johnsurnamerobinson
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I always thought the Blue glow was residual gas in the tube.(and not a very good thing (soft valve!!)) When I have played with x-ray and high vac equipment the glass glows GREEN under electron bombardment.
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Old 29th July 2019, 11:22 AM   #23
enochRoot is offline enochRoot  United States
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The mercury vapor tubes were always my favorite in that regard!
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Old 29th July 2019, 04:24 PM   #24
smoking-amp is offline smoking-amp  United States
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Quote:
I always thought the Blue glow was residual gas in the tube.(and not a very good thing (soft valve!!))
A blue glow at the interior glass surface should be fluorescence ( beam tubes above), while blue throughout the tube would be gas. (WE355A thyratron above)

Thyratrons and gas filled rectifiers should have some nice glow.

Could also put an Argon bulb (AR-1 ) up top, to make fluorescent paint (painted OT) glow.
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File Type: jpg AR-1.jpg (167.4 KB, 397 views)
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Old 29th July 2019, 04:39 PM   #25
mondogenerator is offline mondogenerator  England
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Quote:
Originally Posted by bluerooster View Post
I second the idea of MV rectifiers.
What the hello is this pice of equipment?

Quote:
Originally Posted by smoking-amp View Post
0B3
WE355A
Referring to the photos:

And this too? What is it?

Working in a HV environment I'm intrigued what the devices are. HV supplies?
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Old 29th July 2019, 04:43 PM   #26
smoking-amp is offline smoking-amp  United States
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It's a DIY HV supply for a vintage speaker field coil.
Magic Moment: Tube Power Supply for Field Coil Tweeters
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Old 29th July 2019, 05:22 PM   #27
mondogenerator is offline mondogenerator  England
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Ahhh, that makes sense now I see it!
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Old 29th July 2019, 06:25 PM   #28
johnsurnamerobinson is offline johnsurnamerobinson
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Re cabass:> Having owned many transistor amps and a few valve (tube) amps they not only look different but SOUND different. As to which you will prefer will depend not only on your personal taste,But crucially on the other components especially speakers in your system.Most tube amps have an o/p transformer which effects bass response.Also tend to sound more involving ?????? than transistors which in my opinion are more warts and all accurate.I started building my own valve equipment from age 10 using old tvs and radios from 1950-1960s for parts and find them easy and forgiving to build (generally no HUGE open loop gain). One word of warning the voltage in high power valve equipment is LETHAL. After a lifetime of high voltage electrical engineering I have no idea how I have lived to my age and not fried.
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Old 29th July 2019, 06:59 PM   #29
smoking-amp is offline smoking-amp  United States
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Could take a sodium lamp and run it at low power using a CCS. Looks like the color will change depending on how hot it gets. Probably work as a voltage reference tube too.
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File Type: jpg Sodium_lamp.jpg (301.5 KB, 344 views)
File Type: png Low_P_sodium_L.png (63.4 KB, 346 views)
File Type: jpg low_pressure_sodium_lights.jpg (11.2 KB, 339 views)
File Type: jpg Osram_low_press_sodium.jpg (123.2 KB, 335 views)

Last edited by smoking-amp; 29th July 2019 at 07:07 PM.
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Old 29th July 2019, 09:59 PM   #30
FullRangeMan is offline FullRangeMan  Brazil
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I always read GM70 have a impressive 60W glow mainly the rare copper plate.
Click the image to open in full size.
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