Edgar wrote:

Hello,
I've purchased an 1962 tube HF receiver. Well the problem is I don't know
exact antenna input impendence value of it. I use simple 40m. dipole on a
regular TV cable of 75 ohm. I would like to do some experiments with random
wire, and 50 Ohm coax or 300 Ohm ladder line for dipole. Is there any
circuit that can help me to mach the impendence?

Edgar,
Since I can read and understand Russian I looked at the site you gave in
your post. They say that the antenna input us provided for a symmetrical
twin lead 200 ohms impedance. They aso say that it is a double
conversion receiver; the second If is 85 kHz giving rether good
selectivity. The stability of the receiver is rather poor, and the
anateurs used to use it as an IF amplifier of 2 MHz first IF. If you
want me to translate for you some more data, send me an e-mail. They
also say that any longer wire as an antenna will do. Best wishes,
Bozidar, 9a2hl