W7GZ Ham Radio Page
Solution: Realign FM oscillator section
See my article from Proceedings of the Central States VHF Society.
This construction article appeared in 1987 in Radiotechnika magazine (Hungary). The amplifier was designed by Gabor Draskovits, HA1YA, who produces similar amplifiers commercially for export. The GI7B is a Russian triode suitable for operation at 13 and 23 cm, as well as 6 and 2 meters. The tubes are readily available from several vendors in the Ukraine at quite reasonable prices. The text of the article is in Hungarian, of course, but the schematics and construction layouts are easy to follow. The second half of the article is a 4CX250B amplifier for 432 MHz.
The data sheet for the GI7B tube is provided here.