Construction articles in magazines and books often use part numbers of firms no longer in business or whose parts are hard to find. Many Palomar parts are identical. Use these tables to find substitutes.
FERRITE TOROID SIZE
| Outside Diameter | Palomar Part Number | Indiana General Part Number | Indiana General Old Part No. |
| 2.4” 61mm | F-240 | F568-1 | CF-123 |
| 1.14” 29mm | F-114 | F626-12 | CF-114 |
| .82” 21mm | F-82 | F624-19 | CF-111 |
| .50” 12.7mm | F-50A | F627-8 | CF-108 |
| .37” 9.5mm | F-37 | F625-9 | CF-102 |
| .23” 6mm | F-23 | F303-1 | CF-101 |
FERRITE MATERIALS
| u | Palomar | Indiana General | Stackpole | Ferroxcube |
| 125 | 61 | Q1 | C/11 | 4C4 |
| 40 | 63 | Q2 | C/12 | |
| 40 | 67 | Q2 | C/12 | |
| 20 | 68 | Q3 | C/14 | |
| 850 | 43 | H | C/7D | 3D3 |
| 5000 | 75 | O6 | 3E2A | |
| 1800 | 77 | TC9 | C/24B | 3B7/3B9 |
| 1800 | 73 | C/24 | 3C8 |
Note: Mix 67 replaces old 63. Mix 77 replaces old 73.
To order cores specify both size and material. Example: F50-61
AMIDON CROSS REFERENCE
Iron Powder Cores: Amidon and Palomar part numbers are the same.
Ferrite Cores: Amidon “FT” cores are the same as Palomar “F” cores.
Beads: Table below shows bead size. To complete part number add Mix number. Amidon puts Mix first.
Palomar puts Mix at end. Example: Amidon FB-43-101 is Palomar FB1-43.
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