[ICOM] 751A Info

[Adam Farson]

Hi Jim,

There were 3 versions of the IC-751A:

1. "Old logo" (barred egg), PBT. Manufactured until 1989, S/N 1000 to
approx. 45XX.

2. "New" logo, IF shift. 1989 - 1990, S/N approx. 45XX to 55XX. Introduced
as a result of the PBT patent-infringement affair. PBT reinstatement info
here:

http://www.qsl.net/ab4oj/icom/icom.html#IC751A

3. "New" logo, PBT. 1990 - 1993, S/N approx. 55XX to 9XXX. Product line
discontinued in 1993.

The FL-32 (9 MHz CW, 9 MHz, 500 Hz BW) was stock in all versions of the
IC-751A. Adding the FL-52A (455 kHz CW, 500 Hz BW) dramatically improves PBT
operation in "CW Narrow" mode.

The earliest units tend to exhibit failure of electrolytic capacitors and of
the DC-DC converter transformer on the display board. All versions are
subject to the notorious HPL VCO trimmer failure syndrome.

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 Jim W7RY
Sent: Saturday, July 16, 2005 18:01
To: icom at mailman.qth.net
Subject: [ICOM] 751A Info


Does anyone know when Icom changed the logo on the 751A...  It went from a
capitol I to an i with a round circle above instead of the dot....

Also do you know when the 500 Hz CW (9 MHz) filter was installed as a stock
filter....


Thanks and 73
Jim W7RY


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