UK Vintage Radio Repair and Restoration Discussion Forum

UK Vintage Radio Repair and Restoration Discussion Forum (https://www.vintage-radio.net/forum/index.php)
-   Vintage Amateur and Military Radio (https://www.vintage-radio.net/forum/forumdisplay.php?f=13)
-   -   BSX20 whisker short (https://www.vintage-radio.net/forum/showthread.php?t=159696)

mickm3for 11th Sep 2019 8:48 pm

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

Tim 11th Sep 2019 9:07 pm

Re: BSX20 whisker short
 
I’ve a couple of NOS ones I can send you if you like, or at least the CV equivalent.

G6Tanuki 11th Sep 2019 9:08 pm

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??

mickm3for 11th Sep 2019 9:34 pm

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

MrBungle 11th Sep 2019 11:42 pm

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!

G8HQP Dave 12th Sep 2019 11:24 am

Re: BSX20 whisker short
 
2.3mhz must need a really big antenna!

paulsherwin 12th Sep 2019 12:15 pm

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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