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 understand and read Russian I looked at the site you
mentioned. They say that the antenna input has been forseen for a
symmetrical twin-lead 200 ohms impedance. They also add that any longer
wire would do. They also mention that the receiver has poor stability;
however it is a double mixing superhet, and the second IF is 85 kHz
which gives rather good selectivity. The Russian amateurs used to use it
as an IF amplifier at 2 MHz, so they standardly built a converter with a
crystal XO in it and got a very usable amateur receiver. If you need
some more translation, just send me an e-mail. Best wishes,
Bozidar, 9a2hl