2 Tube FM radio kit from Aliexpress

I review the FM radio kit similar to:
www.aliexpress.us/item/225183...
It works, but the volume is too low to be practical and tuning is limited. It can be used as a power amplifier.

[@muhammadrafique3903]

Very Good information videos thanks sir ❤❤❤Rafique mastoi DG Khan Pakistan 🏝🇵🇰

[@cleangoblin2021]

Tube radios sounds really interesting.
Thanks

[@eugenepohjola258]

Howdy.
Looks like a Colpitts regenerative detector to me. In my mind not a super regen.
John Hunter from Cool Australian Vintage pointed out to me that managing regeneration by controlling the anode voltage produces inferior sensitivity. I suggest You feed full voltage to the anode resistor and manage regeneration by controlling the screen grid voltage.
Best regards.

[@cool386vintagetechnology6]

Yes, it is a Colpitts oscillator, but it will super-regenerate because of the long time constant of the grid circuit.

[@eugenepohjola258]

@@cool386vintagetechnology6 Howdy.
Aha, Ok. Living is learning. Thanks for the info.
Regards.

[@michelvansimaeys6586]

I also have difficultés to see where the typical feedbackloop is injecting in this circuit…

[@Impulse_Photography]

Maybe that 30 ft antenna needs to be wound to be effective - or maybe a Dipole or Loop fashion may help in this case.

[@marc7637]

4 a5 tour sur L1 et 3 tour sur L2 ne donne pas la bande 88 à 108 Mhz mais plutôt 250 Mhz
Il faut au minimum 8 spires pour L1

[@michelvansimaeys6586]

Hello Guys, i also bought this kit and guess what, it does’´t functions eitjes. Although the amplifier does a good job… I connected a function generator to pin one an the soundtrack was nicely amplified.
Question is, how could the input circuit be adapted to make this thing functionning? We could keep the tubes and transformers. Any suggestions ?

[@franklinyoutubehu2349]

I would have to say that maybe if you hook two of these together, that you might get enough amplification to make it useful. Or you could try a really big antenna and a solid ground.

[@readmedottext]

this was really interesting. I like you fix to get it really working.

[@marc7637]

Combien de tour fait la bobine L1 et L2 le diamètre du fil et le diamètre de chaque bobine merci

[@franklinthu]

The coils had 2 and 3 turns, about 1/2 inch diameter. It's amazing that is all it takes to receive the FM signal. Still not sure how that works considering the coils worked best just being loosely next to each other and not nested together like a transformer.

[@KartikPatel-nt4ff]

😅😅😅well information good show 😅

[@perfeitobr]

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