Capacitor C4 may have capacitance from 50- 100- pF.
Capacitors C5 and C7 may have capacitance from 0/05- 0.2- microF.
Capacitor C6 may have capacitance from 500- 1000- pF. Almost any
double triode should be used in the receiver. Figure 4 shows montage of the receiver. It made
by insulated wire in 1.5- mm (15- AWG) diameter.
The receiver needs for plate any high voltage in range
100- 200-V DC. Receiver consumes 5- 10- mA at plate circuit. For
tube heater the receiver needs 6.3- V AC. Figure 5 shows power supply for the receiver.
However it is possible to use any power supply that can be provide
above mentioned parameters.
The first it needs to check generation at the all working
bands. For the checking receiver turn on without antenna and with
help of R2 the receiver is turned on to generation mode. At the
generation mode you may hear whilst in the head- phones. If you
will turn slowly the dial of the C2 you may hear (in generation
mode, without antenna) strong (in the area) signals of CW stations.
Then turn on antenna to the receiver (that is stayed in generation
mode). The antenna should not break the generation. If the generation
is broken it needs to decrease capacity of the C1. If it is not
help or help a little- try to change tap from the L1.
After optimum C1 and optimum tap is found it is possible
to calibrate the receiver. For this you may use or special RF-
Generator or another receiver (to receive generation of the regenerative