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Re: Dead Drake on road to recovery



 Thanks for the part number info , I found a cross reference to a NE85634 
and ordered a half dozen from Mouser for $1.12 each. I tried to use two low 
watt soldering irons to remove the part and could of used 3 irons! I never 
had any luck removing one of the SOT-89 devices in one piece, at home. 
Usually one of the side pins break off, as I can't distribute the heat to 
all 3 pins, especially both sides of the center pin. I do have a propane gas 
iron, I might try that next time.

73 Jeff kb2m


----- Original Message ----- 
From: "Grant Hodgson" <grant@ghengineering.co.uk>
To: <amsat-bb@AMSAT.Org>
Sent: Friday, October 22, 2004 5:53 AM
Subject: [amsat-bb] Dead Drake


> Jeff
>
> The part number of the transistor is 2SC3357 which is in a standard SOT-89
> package.  You could also use a BFQ19 as a close substitute.  These
> transistors can be removed without damage if you have two soldering irons, 
> or
> alternatively with a small localised heat source such as a gas soldering 
> iron
> with a hot air tip or a 'Microtherm' type hot air tool - easily available 
> in
> the UK, so I would have thought that you could get them in the USA.  Not a
> job for the novice but certainly within the capabilities of more 
> experienced
> constructors.
>
> A standard hot air gun used for stripping paint or for use on heat shrink
> tubing is probably too aggressive for a small electronics job and may 
> cause
> damage, but if you have a spare Drake for spares then you could try using 
> one
> of these heat tools as a last resort.  There are 3 similar transistors on 
> the
> Drake PCB, any of which can be used as a replacement for your damaged
> transistor.
>
> Hope this helps.
>
> 73
> Grant Hodgson
> G8UBN@amsat.org
>
>
>
> --
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