14-07-2019, 04:15 PM
I've no idea about the EF184 (1958 or 1960?). It does seem pin compatible and a later version. I've never seen it used.
Or indeed the EF89 (replaces EF85, the variable mu version of EF80?). The two cathode pins become cathode and screen. Likely a problem.
Certainly if I get the VHF working with the EF80 I can look.
I have a spectrum analyser, wobbulator (455K and 10.7M), various analogue signal generators, a DDS generator, uTracer. So I can investigate.
I'm tempted to add 470kHz, 6..0 6.5 and maybe 39MHz to the Wobbulator as well as a external fixed Fin marker.
The cheap 0.1MHz step 87MHz to 108MHz stereo FM modulators for MP3 to car radio are handy too.
Or indeed the EF89 (replaces EF85, the variable mu version of EF80?). The two cathode pins become cathode and screen. Likely a problem.
Certainly if I get the VHF working with the EF80 I can look.
I have a spectrum analyser, wobbulator (455K and 10.7M), various analogue signal generators, a DDS generator, uTracer. So I can investigate.
I'm tempted to add 470kHz, 6..0 6.5 and maybe 39MHz to the Wobbulator as well as a external fixed Fin marker.
The cheap 0.1MHz step 87MHz to 108MHz stereo FM modulators for MP3 to car radio are handy too.
