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> John f rider 121-page tube substitution substitute book
John f rider 121-page tube substitution substitute book
"modern" 1970 edition of JOHN F RIDER Tube Substitution book
This is the high quality JOHN F RIDER Tube Substitution book.
Very Good condition, modern 1970 edition that has 121-pages of substitution!
This book truly covers thousands of tubes and substitutions, covering American, Foreign, European, Commercial, Industrial, TV Picture Tubes, etc!!! Thanks.
