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Author Topic: 2SC2879s exact drop in replacments for MRF-454?  (Read 11857 times)
KM3F
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Posts: 909




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« Reply #15 on: May 20, 2015, 11:32:44 AM »

I maybe guilty of missing the designation as well.
The 454 was used in 2m amps  so I just jumped on it from that point having made the sub already in a 2m amp.
My apologies.
Thanks for pointing that out.
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AC8DC
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Posts: 18




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« Reply #16 on: May 24, 2015, 07:13:10 PM »

I think KM3F is thinking of the 2SC2782 which is used in the TS-480 and can be used as a replacement for the MRF-247 at 2 meters. Keeping all those 2SC and MRF numbers straight can be tough!


« Last Edit: May 24, 2015, 07:17:24 PM by AC8DC » Logged

Chris
AC8DC
KF5KMG
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Posts: 4




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« Reply #17 on: May 26, 2015, 07:14:48 AM »

Planning ahead in the event the MRF 454s bite the dust in the MA1000B. An older e-ham thread indicated the 2SC2879s can be used in lieu of the original MRF454. Does anyone know if this is true or verified? Is there any bias circuitry that would have to be evaluated and possibly changed or are these true exact replacements for the MRF 454? Thanks in advance. Lane Ku7i Newport RI

MRF454s and 2SC2879s are very close... but not an exact "drop-in replacement". A lot depends on the circuit you're using them in. There are some slight impedance differences, so if it's a tuned circuit... you'll have to make some tweaks... but if it's a transformer coupled broadband circuit... you likely could just drop them in and get away with no adjustments.
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