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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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12th May 2021, 2:26 pm | #21 | |
Octode
Join Date: Oct 2019
Location: Stockport, Greater Manchester, UK.
Posts: 1,611
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Re: Valve identification
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12th May 2021, 2:28 pm | #22 |
Octode
Join Date: Oct 2019
Location: Stockport, Greater Manchester, UK.
Posts: 1,611
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Re: Valve identification
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12th May 2021, 2:41 pm | #23 |
Octode
Join Date: Oct 2019
Location: Stockport, Greater Manchester, UK.
Posts: 1,611
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Re: Valve identification
How about this one then? Probably an easier one than the others
Valve 5, a mullard, with PC***?8 or 3 My guess is a mullard pcl88 Thanks again to all those who contributed Gabriel |
12th May 2021, 3:05 pm | #24 |
Octode
Join Date: Dec 2017
Location: Morden, Surrey, UK.
Posts: 1,552
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Re: Valve identification
Pcl83?
sorry, meant PCL82. |
12th May 2021, 3:36 pm | #25 |
Octode
Join Date: Dec 2018
Location: Llandeilo, West Wales, UK.
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Re: Valve identification
I think it is a PCL86. The triode is apart from the pentode structure.
Valve Museum picture . Again there is a Philips / Mullard etch code visible. What is it?
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12th May 2021, 3:42 pm | #26 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Valve identification
PCL85/PCL805 TV frame output valve:
http://www.r-type.org/exhib/abt0019.htm http://www.r-type.org/exhib/acg0056.htm http://www.r-type.org/exhib/aaa0382.htm ? Lawrence. Last edited by ms660; 12th May 2021 at 3:58 pm. Reason: link and info added |
12th May 2021, 3:58 pm | #27 |
Dekatron
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
Posts: 5,189
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Re: Valve identification
Re the dekatron: The number is quite logical --
'G' = Gas filled. 'V' would be 'Vacuum', as for trochotrons and the like. 'S' = Selector. This means all 10 cathodes are brought out to separate pins so you can use it to drive other things. 'C' would be 'counter' meaning cathode 0 is brought out to use as carry output, but the other 9 are strapped together, the only way to read the count is to look at the end of the tube. '10' = 10 states. It actually has 13 external connections, the 10 cathodes, the 2 sets of guide electrodes and the anode. The last is brought out to the metal cap in the centre of the base. I have an old ETL databook on the shelf, I possibly have the data sheet for this valve. |
12th May 2021, 4:01 pm | #28 |
Octode
Join Date: Oct 2019
Location: Stockport, Greater Manchester, UK.
Posts: 1,611
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Re: Valve identification
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12th May 2021, 4:13 pm | #29 | |
Octode
Join Date: Oct 2019
Location: Stockport, Greater Manchester, UK.
Posts: 1,611
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Re: Valve identification
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12th May 2021, 4:23 pm | #30 |
Dekatron
Join Date: Jun 2015
Location: Biggin Hill, London, UK.
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Re: Valve identification
Not really. A nixe tube is a display device with shaped cathodes. You ground one cathode at a time, it lights up in the tube and you see something that looks like a glowing digit.
A dekatron is actually a counter tube. It's a sequential device. Basically you have a discharge on one cathode, you would see a little orange glow at a particular position looking at the end of the tube. By sequencing the 2 guide electrode pins you can move the discharge round to the next cathode. And so on. So it's a 10 state counter and can be used as such, either to count pulses, divide a frequency by 10, or control other circuits one after another, There were 2 classes of dekatrons fron ETL. The 'GC10' series were plain counters. They would step as above, and you could get a carry pulse from them as they passed zero to increment the next digit. You would mount them so the end of the tube was visible on the front panel of the instrument, there was a little numbered ring bezel to go round them. Thus you had a pulse counter which you read out by looking at the tubes and seeing which digit on the bezel had a glowing cathode next to it. The GS10 series, which is what you have, are more versatile. You can use them as above, but also each cathode is wired to a separate pin so you can read them out electrically. I guess you could drive a nixie tube from one with some more electronics. You could certainly use it to control circuits so that the first circuit operates, then after a pulse to the GS10 the second circuit operates, and so on. |
12th May 2021, 5:00 pm | #31 |
Octode
Join Date: Oct 2019
Location: Stockport, Greater Manchester, UK.
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Re: Valve identification
Thanks Tony, I get it now (I think)
Gabriel |
12th May 2021, 6:49 pm | #32 | |
Heptode
Join Date: Jun 2017
Location: Southport, Merseyside, UK.
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Re: Valve identification
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12th May 2021, 6:50 pm | #33 | |
Heptode
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Re: Valve identification
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13th May 2021, 3:40 pm | #34 | |
Heptode
Join Date: Mar 2017
Location: Cedar Grove, Wisconsin, USA.
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Re: Valve identification
Quote:
That set was a great embarrassment to Zenth and rumor has it that the manufacturer recalled many and destroyed them. Why they started using the "G" type valves, when everyone else used either metal or GT type 150ma AA5 types. Dave, USradcoll1, a result of my misspent youth. |
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