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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

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Old 7th Feb 2010, 7:14 pm   #1
oldticktock
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Default CV189 Valves

Hi,

Just wondering If you can shed some light on these valves. I have been sorting through boxes and testing all sorts and then came across these.

I have searched the web and tubecollector lists them but does not give much away.

The reason I ask Is that they stand out from all the others valves I seen/have come across and they intrigue me.

OTT
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Old 7th Feb 2010, 7:20 pm   #2
kalee20
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Default Re: CV189 Valves

Spark gap - see here
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Old 7th Feb 2010, 7:23 pm   #3
oldticktock
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Default Re: CV189 Valves

Hi,been there

see my post
"I have searched the web and tubecollector lists them but does not give much away"

function type of use, to a newb spark gap!!!!! sounds like car spark gap

OTT
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Old 7th Feb 2010, 7:42 pm   #4
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Default Re: CV189 Valves

Oops I didn't read yr post properly

Spark gaps are built so that they break down at fairly well defined voltages, and can pass lots of current if this voltage is exceeded. They are used as protection devices in case of surges, such as lightning strikes on power or signal lines, to stop the voltage rising even higher and zapping something.

They can also be used as relaxation oscillators: you have a capacitor in parallel with the spark gap, which charges via a resistor. As the capacitor charges, the voltage rises until it reaches the breakdown voltage. The spark gap then arcs across, discharging the capacitor (and an important factor here is that the charging current via the resistor must not be sufficient to maintain the spark by itself). When discharged, the spark dies, and the capacitor recharges.

I have come across oscillators like this, which used the spark gap to discharge the capacitor into the primary of a high-frequency step-up transformer (Tesla coil). This gave a train of pulses which were stepped up to several kilovolts to initiate conduction in Xenon discharge lamps.
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Old 7th Feb 2010, 7:53 pm   #5
oldticktock
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Default Re: CV189 Valves

Cheers Kalee20, don't suppose I will find much use for these in my domestic radios then I wonder what the old engineer I inherited my kit from had them for, or what he might have pulled them from, one will never know.
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Old 7th Feb 2010, 8:01 pm   #6
HG MICKE
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Default Re: CV189 Valves

According to the CV Register the CV189 was specified by the Ministry of Aviation,so it may have been used in Radar equipment.

Colin
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Old 7th Feb 2010, 8:11 pm   #7
oldticktock
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Default Re: CV189 Valves

Hmm Military aviation..... I wonder if they were in the cases in pics.

I have two metal cases which have mount holes on the open ends and look like they would have contained something. I currently use them as storage for all my large ww resistors
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Old 7th Feb 2010, 8:42 pm   #8
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Default Re: CV189 Valves

Hi OTT, the cases look like the ones used for R1155 and 19 sets.

Ed
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Old 7th Feb 2010, 8:45 pm   #9
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Default Re: CV189 Valves

Case on the left - R1155, case on the right, Protective dust cover for the TU5 range of coil packs for the BC191 transmitter.

Im off to find my anorak now.....

Nice spark gaps though - go on, build a nice big tesla coil.....
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Old 7th Feb 2010, 8:52 pm   #10
oldticktock
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Default Re: CV189 Valves

I wonder what happened to the rest of it, perhaps i have bits of it scattered, nothing obvious though like the front or dials etc

would these also be from it?

Soz off topic from the CV valves
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Old 7th Feb 2010, 9:14 pm   #11
Sean Williams
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Default Re: CV189 Valves

Er no.

Couple of domestic plug in coils, and a 100 Khz Crystal
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Old 7th Feb 2010, 9:20 pm   #12
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Default Re: CV189 Valves

CV189 is a BS4,whatever that is.

David
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