[ICOM] Raspy CW note on IC751A

[Tom Weigel]

Greetings, Adam:

I have a pristine IC-751A that probably needs new trimmers.  I am quite good 
at replacing parts and working on rigs.  Is this replacement something I 
could tackle, do you think?  Is there an informational somewhere that lists 
the part numbers of the replacement trimmers, do I need sophisticated test 
gear to adjust?  Or should I just go ahead and ask Malcom to do the job? 
Also, suspect the diodes may need to be replaced, due to very close 
proximity of lightning a year ago when the rig was on, which may have 
reduced receive sensitivity.

Hope all's well,
Tom Weigel, ABØJ
Minneapolis, MN
----- Original Message ----- 
From: "Adam Farson" <farson at shaw.ca>
To: "'ICOM Reflector'" <icom at mailman.qth.net>
Sent: Monday, June 11, 2007 2:23 PM
Subject: RE: [ICOM] Raspy CW note on IC751A


> Hi Gary,
>
> Yes, it sounds like the notorious VCO trimmer problem. The 4 plastic HPL 
> VCO
> trimmers will need to be replaced with ceramic parts.
>
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
>
>
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] 
> On
> Behalf Of Gary Nichols
> Sent: Monday, June 11, 2007 11:27
> To: Icom at Mailman.Qth.Net
> Subject: [ICOM] Raspy CW note on IC751A
>
> Good afternoon all, I recently purchased a used IC751A on Ebay and added 
> the
> narrow CW 455khz 250 hz filter to this radio.  I find the CW note on RX is
> very raspy sounding while the same station on my 746pro is quite pure
> sounding.  Any suggestions before I start pouring through manuals and
> reported fixes on the internet?  I am seeing this on the 40 meter band but
> due to few signals anywhere else don't know if all bands are affected or
> not.  Could this be symptoms of defective trimmer capacitors I have read
> about elsewhere?
>
> Thanks in advance.de gary, kd9sv
>
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