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Old 23rd Sep 2019, 12:59 am   #21
red16v
Heptode
 
Join Date: Jul 2006
Location: Winchester, Hampshire, UK.
Posts: 636
Default Re: Mullard glass transistors

Quote:
Originally Posted by AC/HL View Post
The red dot is the collector, but there is also a difference in the leadout spacing. They will work either way round, but with greatly reduced gain, maybe that's what is being tested.
All Mum told me was that they picked up a transistor and put the three leads on some sort of test bed and observed a centre zero meter. If the needle went to the left they painted a red dot on the case on the left hand side and vice versa. Happy to accept my error with emitter and collector marking rather than Mum!

I worked with a few Mullard apprentices some years later myself as part of an ond course. They said the first years output of the factory was underneath one of the factory perimeter roads as they tried to get to grips with mass production! They also said site security was very very tight as a whole weeks worth of production could be put in the back of a transit van and if the van got nicked well .. you can imagine the consequences. All bulldozed now of course.
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