Two Tube, MW, LW, NDB, 12 volts

Ahoj!
Hi Dave!

Receiver works very good, I use ferrite rod with MW/LW coils from old russian transistor radio, and audio (LF) choke from Wehrmacht.

Because I use coils for 500pF capacitor but I use 720pF, I can tune also NDB band (nondirectional beacons for airplanes) cca 600-200kHz or band under 150kHz: I can heard also 147kHz RTTY METEO from Germany and data transmission at 139 and 129kHz too!

Earphone: you can use 4kohm earphone, also crystal earphone. I use 2x75 ohm (150ohm mono) earphone AFR200 from Czechia (also 30y old...) with small 75R speakers: it is the best!!!

Best version is with 6F31 and 6H31!

MW Receiver with an EM83 Tube

NDB Receiver Uses Two ECC/PCC88 Tubes

It is a receiver with two ECC/PCC88 and 13-14V for anode. HF amlifier, audion, 2x audio amplifier.

I used "all old parts" which I found at home:
PCC88 is from old czech TV set, also variable resistors with holder and knobs, holder and switches with knobs are from old TV set from USSR. Variable capacitor is from Riga 103 receiver, made by USSR too. Connectors are from TV set Shiljalis 401D, also from USSR.

The audio transformer is from an old czech TV set and RF choke is from an old UPS for computer. Coils are old IF transformers for 455kHz from some tube receiver... Some resistors and condensers are older than me! Cable and wires are from old computer.

Other Projects

Galena s crystal dectector in "fuse tube" work good!!! "Fuse" is cca 32mm long.

See also transistor sw receiver: here is transmission for variable capacitor from old mechanic telephone dialer! (my terrible idea...)

RV2.4P45 Tube in Space Charge Mode

2SH27L "Negadyn"