Thanks Dan!
That's what I needed. I was using google rather than looking in the
archives.
73
Gary K4FMX
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> On Behalf Of Dan
> Sent: Friday, January 15, 2010 5:01 PM
> To: Amps reflector
> Subject: [Amps] 8877 date codes
>
> A quick archive search for 8877 bad date codes found all sorts of
> information. One post by G3RZP seems to have a good summary of the
> problem. Here it is:
>
> "Here's a copy of what I was sent on the subject: It includes some infor
> from
> Dick at ETO
>
>
> >/Here is the 8877 info. Looks like you want to avoid 8877's with a
> date/
> >/code anytime frm 1986-1988./
> >/For those who expressed interest and/or skepticism about the issue,/
> >/here's a reasonably accurate time line of events from our QA records./
> >/Eimac puts 8877 heat dam design change into production -- ~08/86/
> >/ (Completely unknown to us at the time)/
> >/First identified tube failure at MRI end-customer field site -- 12/86/
> >/First suspect tube routed back to Eimac via ETO -- 01/87/
> >/Meeting with Eimac -- 05/87/
> >/FIrst fix devised by Eimac; second meeting w/Eimac -- 07/87/
> >/Third & fourth meeting with Eimac -- 08/87/
> >/Initial Eimac delivery of "fixed" 8877's -- 09/97/
> >/Delivery of "fixed" 8877's to customers -- 10/87/
> >/Problem re-surfaces @ field customer(s) -- 03/88/
> >/FIfth meeting with Eimac --/
> 05/88
> >/Second fix devised by Eimac -- 06/88/
> >/Initial Eimac delivery of 8877's with second "fix" -- 08/88/
> >/Delivery of "2nd fix" 8877's to MRI customers -- 09/88/
> >/Completion of field upgrade with replacement tubes -- 05/89/
> >/** NOTE: Because tube date codes approximate/
> >/ shipping rather than manufacture dates,/
> >/ they may vary ~1-3 months from the/
> >/ event dates given above./
> >/Largest MRI RF amplifier manufacturer's record/
> >/of 8877 usage by year:/
> >/ In new amps As replacements/
> >/ almost 100% due to/
> >/ heat dam/g-k shorts/
> >/1987 500 575/
> >/1988 650 1600/
> >/1989 500 550/
>
>
> 73
>
> Peter G3RZP"
>
> 73, Dan, N5AR
>
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