I’m still tossing up what TEF to buy, reading just about everything I can, the silver ones seem to have crisper/clearer sound than the blue ones but there’s nothing wrong with the blue ones sound, apparently the sound varies depending on received signal strength of stations, strong signals must distort the sound a bit on one of them, one guys review I read has both & said one sounds better in the city areas & the other outside the city area.
I’ve also seen inside the one @Radiohead has, as a guy who has one, much like @Informer pulled it apart, while it has 2 speaker grills on the front, from V5.0 onwards it only has one speaker, which is supposedly better than the previous (stereo) versions, under the second speaker grill it’s only a fake speaker.
Also that one Radiohead has, doesn’t have an LNA, it’s not permanently on & not software changeable, it needs the switch on the side.
Looking from the back, the printed circuit board is made to have the LNA & switch, but those that have no switch have no LNA components on the PCB either which looks to be located at the top right hand side of the board, just to the left/behind the switch, those radio’s with the LNA & switch, the LNA circuit is shielded with a metal cover, on those without the switch & LNA, that space isn’t shielded/covered, you can see the components circuit tracks.
It’s not possible/available to have the LNA in the silver ones, & apparently the LNA boosts the signal level by 20dB & can cause some RDS reception issues if you boost already strong signals with it on, this may be resolved with a later firmware version, who knows, but it’s currently albeit probably minor one with the latest V2 firmware.
Knowing that now, I can see why Informer is rightly pissed about paying extra for one with the LNA, but not getting it.
I actually want one of these https://www.pe5pvb.nl/tef-dsp-fm-tuner-v2/?fbclid=IwAR0nhjkuEbnckcVkL6XohRO-_io9LRvHH11AQUX_JXzRUbdDbmVLsvTQEKw