[ICOM] 706 MK2G Finals - possible replacements?

[Clif Holland]

They have 10 in stock. Did you ask them for a price quote?? I've dealt with 
them before.

Clif Holland KA5IPF
www.avvid.com




----- Original Message ----- 
From: "AA6DX - Mark" <aa6dx at arrl.net>
To: "ICOM Reflector" <icom at mailman.qth.net>
Sent: Wednesday, January 10, 2007 6:33 PM
Subject: Re: [ICOM] 706 MK2G Finals - possible replacements?


> Try here .. is this any help?  Or am I missing something... entirely
> possible .. HIHI...
> http://www.1sourcecomponents.com/partinfo/srfj7044.htm
> Mark Nelson  -  AA6DX
>
> mailto: AA6DX at ARRL.NET
>
> ----- Original Message ----- 
> From: "Clif Holland" <clif at avvid.com>
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Sent: Wednesday, January 10, 2007 1:44 PM
> Subject: Re: [ICOM] 706 MK2G Finals - possible replacements?
>
>
> I ran into this problem a while back. Motorola discontinued the 7044 for
> whatever reason leaving Icom high and dry. Something like in the middle of 
> a
> production run and oops no more transistors. I could not find a sub for 
> it,
> no-one lists anything. I was told the replacement board has electrical
> differences. They are limited as to replacements because they have to use
> the existing heatsink That being said since the 7044's from Icom were 
> almost
> $100 each the whole assembly for $300 is not a bad deal. Last time I
> conversed with them the board wasn't available, maybe they have cured that
> problem anyway.
>
> Clif Holland KA5IPF
> www.avvid.com
>
>
>
>
> ----- Original Message ----- 
> From: "Dan Doss" <kg0mm at arrl.net>
> To: <icom at mailman.qth.net>
> Sent: Wednesday, January 10, 2007 2:16 PM
> Subject: [ICOM] 706 MK2G Finals - possible replacements?
>
>
>> Hello all,
>>
>> First off let me say that I'm relatively new to the reflector so please
>> excuse any redundancies in what follows on the subject. That being said -
>> I, like many on the reflector, have had to replace the HF finals on the
>> 706. The last time I did, the original SRFJ7044 MosFET's were available
>> from Icom, albeit at a premium price. A call to Icom yesterday brought me
>> aware of the fact that these transistors are available only for repairs
>> made by Icom services centers. This fact may already be known by many, 
>> but
>> was a little disconcerting to me. I was told that the only way one (an
>> individual) could repair their blown finals was to buy a complete new PA
>> assembly. I was given a part number of 98414684 (which is available) and
>> lists for $293.33. Yikes! I was also told that the finals used on the new
>> PA assy were not "compatible" with the older boards. When asked if this
>> was due to electrical or physical reasons, the nice parts lady indicated
>> that she thought is was because of physical differences. This was not
>> confirmed by an Icom tech.
>>
>> After a bit of research, I found that the SRFJ7044 MosFET is packaged in
>> what Motorola/Freescale/MA-Com calls "Case 316-01". This is a 6-legged
>> package with is attached to the heatsink with two screws. Other similar
>> MosFET's (such as MRF150) use a stud-mount style package. I have not seen
>> what transistors are used on the new style PA. There may very well be 
>> both
>> physical and electrical differences between the two parts. Without having
>> data sheets on either, it's difficult to ascertain if an off-the-shelf
>> (and still in production) replacement part exists. I seriously doubt that
>> Icom would be the least bit interested in locating such a device.
>>
>> Not to be too long winded about the subject, but at a repair cost of
>> nearly $300, it might be worth it to the group if we could attempt to
>> locate another non Icom-specific part to repair our rigs with. If anyone
>> has access to a network analyzer (and a spare '7044), it should be
>> possible to characterize the old part so that a potential replacement
>> could be researched. A quick search on MA-Com's website yielded a couple
>> of transistors of the same power class and package that _might_ have
>> similar characteristics (s-parameters, etc) to the '7044. I would be
>> willing to use my 706 as a "test bed" for the cause if we can get some
>> specs on the old part.
>>
>> Let me also say that I am not in the business of repairing radios for
>> hire. I just hope to spark some interest so that we might be able to keep
>> our venerable 706's running without having to break the bank for repairs
>> or as might be hoped by some, buying new rigs...
>>
>> Any thoughts???
>>
>> 73,
>> Dan - KG0MM
>>
>>
>> ----
>> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
>> Icom Users Net: Sundays, 1700Z, 14.316 MHz
>> Icom FAQ: http://www.qsl.net/icom/
>>
>>
>
>
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
>
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
>
>