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The problem is that you don't know if modern or even NOS specified
replacenemt parts are in fact exactly equivalent. In my CTC-100 restoration
I found that for the notorious white coils they were not.
Do you have a scope and sweep generator? If so, you should
play with various parts to get a good result. This will result in you
learning how to sweep and play with parts in a non-stressful
situation.
You are unlikely to find an adjustable 400uH coil in a modern
catalog. Try Playthings of the Past and look in old Miller or Meissner
catalogs to see if they have what you need. A Miller 6195 will work.
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