From G.W. Crawley
750 ml water
50 grams Sodium sulfite
1 gram Phenidone
12 grams Hydroquinone
70-125 grams Sodium thiosulfate, pentahydrate
10 grams Sodium Hydroxide
Water to make 1 liter.

From H.S.Keelan
750 ml water
50 grams Sodium sulfite
10 grams Phenidone
15 grams Hydroquinone
110 grams Sodium thiosulfate, pentahydrate
18 grams Sodium hydroxide
18 grams Potassium alum
Water to make 1 liter.
Both say to add the Phenidone to the water and DO NOT mix. Adn to use COLD water when dissolving Sodium Hydroxide as it generates considerable heat. If you use hot water, explosive violence can result in serious burns.

You should check your library for Stephen G. Anchell's "The Darkroom Cookbook" from Focal Press.