A 1967 article, by W4BRS, in 73 Magazine gave a very good explanation of how to use a T200-2 toroid as an RF amplifier’s tank coil. Turns for all bands then in use are given, as are photos and drawings. Here is a copy of the issue that contains the article, found on page 6.
The article explains and illustrates the creation of a compact switch-mounted multi-band toroid for powers of 100W, 500W and 1KW+ transmitters.
The 500W design is particularly suited to creating a very compact amplifier, like Lew McCoy’s “Junker Amplifier,”
which uses a single, inexpensive, 813 tube to produce 500 watts input.
A second tube can easily be added to this design to produce 1KW input.
Download this Excel table which shows how many turns of wire to use for each band, using the T200-2 as described in the article. Since the article was written before the WARC bands were implemented, some turns values were added to the table, for the WARC bands.