[NLRS] [Mw] 1296 Amplifier Transistors

[Al Ward]

Bill
I am curious how they "refurbish" a semiconductor device!!! Tuner cleaner
and a brush?
73
Al W5LUA

-----Original Message-----
From: microwave-bounces at lists.valinet.com
[mailto:microwave-bounces at lists.valinet.com] On Behalf Of Bill Ress
Sent: Friday, September 11, 2009 5:13 PM
To: Darrell
Cc: NLRS List; microwave at lists.valinet.com
Subject: Re: [Mw] 1296 Amplifier Transistors

Hi Darrell,

The web site shows the device as "refurbished." Now I'm not sure what 
that means relative to a semiconductor device. These could well be 
devices that fell out of the Motorola manufacturing specification 
limits. Aaah, but the price is right.

Regards...Bill - N6GHz

Darrell wrote:
> Hi Scott and Group;
> I would caution against purchasing those MRF286 devices from China. I 
> purchased a number from them Directly through PayPal on their Web.
> Problem:
> Motorola specks input Capacitance as 140pF, theirs is close to 165 to 
> 170pF Input and their output Capacitance is approaching 100 relative 
> to 51pF as in TRUE Motorola Specks.
> 
> So unless you can model the PCB and change Device Pinch Off Voltage 
> as well as Ciss & Coss in the modeling software there are problems in 
> replacing the TRUE MRF286  device.
> 
> Regards & Thanks, Darrell
> 
> At 08:51 AM 9/11/2009, Scott wrote:
>> Here's a source of the MRF286 transistors as used in the W6PQL 1296
>> amplifiers.  These are the flange mounted devices so they should be
>> easier to build with as you don't have to try to solder them to a heat
>> spreader.  I have no affiliation with this guy (Hong Kong), but it sure
>> seems like a decent deal....
>>
>>
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=360183767487&ssPageName=A
DME:B:WNASIF:US:1123
>>
>> --
>> Scott N0EDV
>> http://corbenflyer.tripod.com/
>> Flying Corben Junior Ace - Building RV-4
>> Gotta Fly or Gonna Die
>>
>>
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