Hi Jim,

I found this info that might help. The MRF966 is available from RF Parts for about $6.00. - Howie AB2S

Title: RE: Preamp on RF Concepts brick amp - GaAsFet?

Post by: K4RTS on May 11, 2010, 03:51:53 PM From the CF300 Data Sheet from Telefunken (From a pdf of the datasheet..cannot find a way to attach it here .)

N-Channel-GaAs-MESFET-Tetrode Depletion Mode

10 Volt 80 mA 1.1 dB N.F. @ 800 mHz 200 mw power dissipation

Its a GaAsFET....just a dual gate GaAsFET that was the thing 25 years ago May be replaced with a MRF966....I have tried both and see no noticeable difference in performance to my untrained ear.

73 Richard / K4RTS

To: amsat-bb@amsat.org; W6OAL@aol.com From: jim@coloradosatellite.com Date: Wed, 22 Jun 2016 10:13:16 -0600 Subject: [amsat-bb] Telefunken CF300 needed

I'd appreciate any leads to a source of Telefunken CF300 dual gate MosFETs used in the old Landwehr UHF preamps. We are trying to resurrect one here.

Jim

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