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Hi I'm just attempting to bring a 1650/2 back to working condition. We had a continuos bleep no display on 1st power up, and we now have on power on from stby,
It depends on the plating on the encapsulation – if tin, it is susceptible to dendrite (whisker) development, as well-documented by NASA and others. The
Has anyone ever see the audio output or driver transistors affected by whiskers? I think the current available in those circuits might fry them. The only
Gents Attached file actually shows the real thing, for those of you who wonder what it’s all about. Graham From: eddystone_radio_users@...
I can confirm that, blowing the short with a capacitor charged up with a megger works and the transistor survives. Solder ECB together and discharge the cap
Please consider the possibilty of repairing the transistors. I have an EC-10 now fully operational that had three bad "tin whisker" shorted transistors. I
Indeed those OC171 transistors, even NOS ones, can have the tin whisker problem, but many do survive and work fine – I have then working ok in two EC10s, but
Jose It depends on how original you wish to make the EC10. If your OC171s are OK, then fit them with the knowledge that “tin whiskers” might give problems
Happy birthday José and good refurbishment! 73 de Jean-Claude, HB3YDH Am 14.05.2017 um 12:57 schrieb 'Jose V. Gavila' eb5agv@... ... Happy birthday
Hello Graham, Thanks for your message! Yes, I have read about that problem... So, in your opinion, would it be better to 'upgrade' the unit to Si devices or
Jose V. Gavila
Jose The chances are that the OC171s were replaced because they suffered from “tin whiskers” internally. If the NOS OC171s are of a similar age (i.e.
Congratulations. Always worth checking on restoration section of the web site ChrisG0EYO Sent from my iPhone
Hi all, Well, even if not a 'gift', as I bought it for myself :-), I got yesterday in a local QRP ham radio meeting (EA-QRP Club in Sinarcas, Valencia, Spain)
Jose V. Gavila
17:52 GMT 3.5 hours left... http://www.ebay.com/itm/152539358311?ul_noapp=true ... This email has been checked for viruses by Avast antivirus software.
... I appreciate that "octal" is the only word in this post relevant to Eddystone but some members have interests outside the Group. I want to replicate the
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