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Canon DSLR Challenge | all galleries >> Challenge 76: ADVERTISEMENT (Host: Vikas Malhotra) >> Challenge 76: Eligible > Comm Systems *
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17-SEP-2006 Melbob

Comm Systems *


Old Vacuum Tubes (or radio valves) used in the 1930's up to the 60's. The large tube is an 807 famed as a low power transmitting tube, the smaller one is a 60's vintage vacuum tube used in most radios and early TV sets and audio devices. The very small 'transistor' is one of the earliest solid-state devices that replaced vacuum tubes.
Together they represent a transition from the 1920/30's through to the 1960/70's.
The grey cylindrical objects are 'electrolytic capacitors', these can still be found in modern electronic devices where large capacity is needed. ... most commonly in those massive amplifiers that 'audio freaks' use in their cars to deafen everybody and produce that 'head-banging' noise... 'KABOOOOM KABOOOOM etc' that one can hear well before sighting the offending vehicle!

other sizes: small medium large original auto
jnconradie19-Sep-2006 10:37
Thanks for the comments and explanations, Bob. :-) Much appreciated. Regards ~jnconradie
Canon DSLR Challenge19-Sep-2006 03:29
Hi Nico, the main glass vacuum tube is an old transmitting tube coded 807 and the other devices are electrolytic capacitors and a miniature vacuum tube (valve as it was sometimes referred to) These devices I used to build my first radio transmitter in the early 1960's. The devices together are old 'communications' devices... just interesting shapes in this day and age, all of which have been replaced by micro-miniature 'solid-state' devices.
The only thing showing Nico is that I'm obviously an 'old F_RT', certainly not ignorance on your part... LOL Thanks for asking ~ regards Bob.
jnconradie18-Sep-2006 14:35
Melbob, I know this is bound to advertise my ignorance, but may I please ask you to give me some clue what this is that you photographed? I just cannot imagine ever having seen such an object / device...? Thanks and regards. ~jnconradie