[NLRS] Wanted SRF 3897 transistor

[Dr. Gerald N. Johnson]

Correction. The Klitzing amp used MRF245.

73, Jerry, K0CQ

On 4/10/2015 7:54 PM, Dr. Gerald N. Johnson wrote:
>
>
> SRF is Motorola for special. Probably is a standard part specially
> selected or labeled. Its not a distributor part. RF Parts sometimes has
> cross referenced parts. Probably should be replaced in pairs. Is RF
> Concepts still alive? They ought to have replacement parts. Probably not
> since google showed a few exactly similar requests over the past decade.
>
> forums.qrz.com/showthread.php?271249-VHF-Mobile-Amp-Transistors-Needed
> suggests MRF245 or NTE352 from 5 years ago.
>
> rec.ham-radio.narkive.com/XgOV4PXR/looking-for-mrf-248 had exactly the
> same problem you have and was looking for MRF248 some 8 years ago.
>
> RFparts.com has MRF248.
>
> Several distributors claim to have the NTE352. Newark wants 2.5 times
> RFparts price for the MRF248. Close to what I paid Radio City for a
> working Diawa amplifier last summer. Dan had a Mirage, but I've blown a
> Mirage with a bad relay and shorted at least one of the output
> transistors. Fortunately I had only paid $10 for it an an auction. I'm
> down on that Mirage design after spending time inside it.
>
> Some vintages of Mirage 160 watt amps use SRF3417, others use MRF247 for
> 160 and 180 watt ratings.
>
> www.w6pql.com/klitzingamps/2m10w180.htm old technology used MRF247. His
> latest product has a lot more power with LDMOS FETs. And pricey.
> www.w6pql.com/parts_i_can_provide.htm
>
> 73, Jerry, K0CQ
>
> On 4/10/2015 7:05 PM, Melvynkc0p--- via NLRS wrote:
>>
>>
>> I have a RF Concepts RFC2-217 amplifier for 144 MHz. with 2 watt drive,
>> supposed
>> to be 170 watt out. Mine only puts out 65. Repair man in Twin Cities says
>> one of the
>> finals is burned out. Part is SRF 3897 according to the schematic, but
>> currently
>> not available (unobtainum).
>>
>> Does anyone have one, or could a pair of something else be used ? Or do I
>> have
>> another "almost works" ?
>>
>> 73 Mel KC0P/R
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