[ICOM] 751A Info

[Jim W7RY]

Thanks Adam!

I knew you would know the answer.

73
Jim W7RY

At 07:51 PM 7/16/2005, you wrote:
>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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