My 3 Valve TRF Regenerative HF Receiver.MP4

My 3 Valve TRF Regenerative HF Receiver.MP4. This was my second attempt at constructing a valve receiver back in 1997 and I have since then come a long way, mostly with VHF designs and an HF Shortwave Superhet design. I will describe this design as follows. The first stage is a untuned RF amplifier using a wide band choke at the aerial input and an EF91 Pentode is used. The second stage is a Regenerative detector using cathode feedback and uses potensiometer adjustment for feedback control rather then the common capacitor and anode feedback method resulting in better stability with no backlash. The Pentode section of 1 ECF82 is used for the Regenerative Detector and the triode section of this valve is used as an audio driver stage and drives an EL84 power pentode just nicely. The power supply is the normal 6.3V AC for the valve heaters and a 50 volt HT line is used. Despite the short comming of the regenerative receiver, which is having to constantly readjust the regen control when tuning one end of the band to another, they are a good learning point in radio before moving on to superhet receivers. Circuit and construction details can be found at my following webpage http://philsvalveradiosite.co.uk/philsvalveradiosite/simple2valvetrfreceiver_...

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[DYDYESSBROMASAUDIO]

unstable work with you SSB mode