I think he's confused?, 455KHz is the standard AM IF frequency, or the second IF in a narrowband FM receiver - standard FM is 150KHz width.
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Broadcast FM stations are spaced at 200KHZ, as I recall. I am using 150KHZ filters in my FM receivers at the expense of slightly reduced audio fidelity.
SFA10.7MF is 455KHZ BW? Way too wide!
The 150KHz is also for stereo channels, you can use a smaller bandwidth for mono only stations (if any exist these days?), some older high quality tuners were switchable accordingly - my oldish Kenwood tuner is (or was, as it's packed away unused now).
We can buy a very expensive vacuum tubes amplifier. Its tubes glow in the dark and it heats your home but the tubes are not part of the solid state amplifier circuit. They are there only to be seen and make some warmth.It is beautifull to use in the dark![]()
Wow!! mind-blowing..
I'm ready to buy it...so that I can help u to keep ur house cool![]()
$5,000 for a homemade heater, then you can have it![]()
Sometimes I wonder on the extreme construction techniques followed by old radios. All the spares were of high quality and clever assembly! After IC's came radios are made by local industries also and quality became pathetic. Older ones are gold and they run for many years even after rough uses. Nowadays, I think it's not possible to achieve such quality.
Grundig (German company) made many excellent world-band radios until they went bankrupt in 2003. The new Grundig company sells junk.