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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 11th Sep 2019, 8:48 pm   #1
mickm3for
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Default BSX20 whisker short

Hi just found a bsx20 this is a npn silicon with short emitter to case the colector is int conected to case so the tr is s/c c to e . 12volt between e and case - to e cleared sc prob temp fix this is in a Howes dfd4 counter that i built many years ago it was working yesterday Mick
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Old 11th Sep 2019, 9:07 pm   #2
Tim
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Default Re: BSX20 whisker short

I’ve a couple of NOS ones I can send you if you like, or at least the CV equivalent.
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Old 11th Sep 2019, 9:08 pm   #3
G6Tanuki
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Default Re: BSX20 whisker short

Thanks for the heads-up!

I've got a load of TO5-cased CV7343 (BCY30-equivalent) transistors here, all produced by the Texas Instruments plant in Bedford in the 1960s - I've been happy to use them for generic duty in things like relay-drivers, but is this wise??
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Old 11th Sep 2019, 9:34 pm   #4
mickm3for
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Default Re: BSX20 whisker short

Hi thanks fitted bc 109 seems to work ok only used as a pre amp for local osc in 2.3 to 3.3 mhz will take you up on offer if needed thanks again Mick
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Old 11th Sep 2019, 11:42 pm   #5
MrBungle
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Default Re: BSX20 whisker short

2n2369 is same part. CPC still sell new ones for 0.44 a go!

Quite worrying to hear of tin whiskers in them though!
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Old 12th Sep 2019, 11:24 am   #6
G8HQP Dave
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Default Re: BSX20 whisker short

2.3mhz must need a really big antenna!
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Old 12th Sep 2019, 12:15 pm   #7
paulsherwin
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Default Re: BSX20 whisker short

It may not be a tin whisker of course. There may have been a different manufacturing fault which has finally 'gone bad'.
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