AlK0FRP@aol.com wrote:
> I have cross references but need the actual specs. I an just try to find the
> perfect final for the Sierra. The OHR classic used 2sc2075 and did well on
> 20m. but don't know how it would so on 17-10 m.
>
> The MRF 237 is a VHF xsistor but may work better on the higher bands. Some
> have said that Dan's 2SC2075/MRF475 are not up to spec as original marked
> xsistors.
Al, I replaced the final in my Sierra with a 2sc1306 that was a pull from an
old 23 channel CB. ( The common cross reference is to a mrf 476 as mentioned .)
The leads have to be crossed over ( collector is in the center ) , and the
transistor sits up kinda high ( especially with the $ 2 radio shack heat sink ),
but it barely gets warm @ 5 w out on 20 and 40 .
I also get significantly more out on 17 m than the stock 3553 did.
These transistors were designed to be used at 27 mhz and make good rf .
I havn't built modules for 10 or 15 m yet , but will when the spots improve.
72.5 , Stan N6XU
[
QRP-L Archive |
]
[
1993 |
1994 |
1995 |
1996 |
1997 |
1998 |
1999 |
2000
]