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4383

1650/2/A

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,
Chris R
04:51
#4383
 
4382

Re: A nice birthday 'gift': boxed EC10

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
Gerry O'Hara
15 May
#4382
 
4381

Re: A nice birthday 'gift': boxed EC10 [1 Attachment]

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
Bruce Gentry
15 May
#4381
 
4380

Re: A nice birthday 'gift': boxed EC10

Gents Attached file actually shows the real thing, for those of you who wonder what it’s all about. Graham From: eddystone_radio_users@...
Graham Holloway
15 May
#4380
This message has attachments
  • DOC
    603 KB
    AF114 Whiskers.docx
4379

Re: A nice birthday 'gift': boxed EC10

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
Nick Gregory
15 May
#4379
 
4378

Re: A nice birthday 'gift': boxed EC10

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
Bruce Gentry
14 May
#4378
 
4377

Re: A nice birthday 'gift': boxed EC10

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
Gerry O'Hara
14 May
#4377
 
4376

Re: A nice birthday 'gift': boxed EC10

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
Graham Holloway
14 May
#4376
 
4375

Re: A nice birthday 'gift': boxed EC10

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
casy_ch@...
14 May
#4375
 
4374

Re: A nice birthday 'gift': boxed EC10

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
14 May
#4374
 
4373

Re: A nice birthday 'gift': boxed EC10

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.
Graham Holloway
14 May
#4373
 
4372

Re: A nice birthday 'gift': boxed EC10

Congratulations. Always worth checking on restoration section of the web site ChrisG0EYO Sent from my iPhone
Chris Pettitt
14 May
#4372
 
4371

A nice birthday 'gift': boxed EC10

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
14 May
#4371
 
4370

eBay

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.
Louis Vermond
13 May
#4370
 
4369

: Denco Green Octal Based Coils....

... 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
hornpipe112
8 May
#4369
 
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