A non audio tube. I'm totally lost, please help - diyAudio
Go Back   Home > Forums > General Interest > Everything Else

Everything Else Anything related to audio / video / electronics etc) BUT remember- we have many new forums where your thread may now fit! .... Parts, Equipment & Tools, Construction Tips, Software Tools......

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 30th November 2011, 10:47 AM   #1
diyAudio Member
 
Join Date: Nov 2011
Question A non audio tube. I'm totally lost, please help

Dear forum members.
Please forgive me for jumping in this forum, but considering my question is vacuum tube related I thought you could help me.
I need some info about a vacuum tube with the following label:
SUNVIC Hot wire Vacuum switch
Type 700
Style 280612

The only info I have is this is used in a 60 years old acid Battery Charger timer.

Forgive me any mistakes but English isn't my first language.
Thank you for your help!
  Reply With Quote
Old 30th November 2011, 11:04 AM   #2
diyAudio Member
 
thaumaturge's Avatar
 
Join Date: Aug 2011
Location: Utah
Well, first answer is that it isn't an amplifying tube, but a set of switch contacts inside a vacuum enclosure made to reduce contact arcing. The hot wire will cause a bimetalic element to flip, either making or breaking the contact as a result. Think of it as a relay. At which current it does this is a guess without manufacture info.
Hope this helps
Doc

From Nature, july 1948:

"Hot-wire Vacuum Switches

SUNVIC CONTROLS, LTD., 10 Essex Street, Strand, London, W.C.2, manufacturers of vacuum switches, temperature control and associated equipment, have recently issued a 16-page illustrated pamphlet describing their hot-wire vacuum switches. The Sunvic hot-wire vacuum switch is contained within an evacuated glass tube not much larger than an ordinary radio valve, and is a non-arcing electric relay, the operation of which depends on the fact that when an electric current is interrupted by the separation of two surfaces in a vacuum no arc is formed. The movement necessary to close or open the switch is quite small and is provided by the thermal expansion of a special steel wire through which a control current of some 25-60 m.amp. is passed. The switch contacts are tungsten and are normally held apart against a compressed spring, which is released by the expansion of the hot wire. The operating characteristics of many different forms of hot-wire vacuum switches with various time delays, closing currents and current-carrying capacities are listed, and twelve different standard circuit and wiring diagrams are shown. The hot-wire vacuum switch is capable, in various sizes, of handling up to 10 kW. at 440 volts, and is suitable for controlling alternating or direct currents up to 30 amp. and voltages from 10 to 600."
__________________
Ne timeas a facie mulierum ea ignorare

Last edited by thaumaturge; 30th November 2011 at 11:11 AM.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Weird tube was lost in my closet for 35 years 2nTim Swap Meet 0 30th October 2010 01:10 PM
lost a tube ultrachrome Tubes / Valves 1 23rd February 2010 06:53 AM
Need suggestions for my next TT - totally lost in the sea of TT models Razorblade Analogue Source 10 22nd April 2009 12:28 AM
CDROM - No Digital Audio Outpt -- Totally Stumped x-pogo Digital Source 6 15th August 2008 11:46 PM
Lost in home audio bartram02 Multi-Way 118 3rd February 2005 11:13 PM


New To Site? Need Help?

All times are GMT. The time now is 04:46 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2