[Ron Ramirez]

Make an educated guess based upon the facts available.

We know that this version of the 89B is a 1935 model, and it went into production between May and June of 1934. A radio's model year started in the very late spring of the previous calendar year when they were introduced first to the dealers, then to the general public.

We also know that since your 89 uses a 36 det-osc tube that it could not have been built after August 31, 1934 since the switch to type 77 was made on September 1, 1934 (run 14).

So...this means your 89 must be run 12 or 13. I would go by the run 13 schematic shown at this link. Even if your radio has a 15,000 ohm resistor at part (10), I would change it to 10,000 ohms or even 7.500 ohms for best possible performance from that finicky 36 tube.

Don't forget to bake that oscillator coil...and count on rewinding its tickler winding. Bake first, then rewind. Bake it at 200 degrees F for 30 minutes. Your coil will thank you for the opportunity to lose that residual moisture it has been collecting since 1934.