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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 10th Jun 2024, 9:10 pm   #1
60 oldjohn
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Default OC81 in X18 case?

I had this given to me at RetrotechUK. I have never seen one until now, it is British made. How common were they?
X18 case is 13mm high. The X02 is 15mm high Mullard, Holland.

John.
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Old 11th Jun 2024, 10:09 am   #2
paulsherwin
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Default Re: OC81 in X18 case?

Not common at all. I suspect it was made at the GEC semiconductor plant after it merged with Mullard. It could even be a GET113 marked as an OC81 - they have very similar characteristics.
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Old 11th Jun 2024, 12:44 pm   #3
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Default Re: OC81 in X18 case?

The case style looks similar to Semics, a Plessey company: http://wylie.org.uk/technology/semics/Semics/Semics.htm
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Old 11th Jun 2024, 2:50 pm   #4
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Default Re: OC81 in X18 case?

Hello,

I have bag of ‘OC72’ in the case on the right.

From memory some of these came from the likes of Bi-Pre-Pak in Westcliff, and were re-marked transistors, or as we used to say - remould transistors.

Pic attached.

I have some AC128 in a TO5 case I think from the same source.

Terry
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