| VRN Series | Spectrol Series | NTE Series | Description |
| 170, 180 | 75H | 500-0300 | 1/4" Round, ST, Cermet, Top Adj |
| 260-208 | 74X | 500-0280 | 1/4" Square, MT, Cermet, Side Adj |
| 450-20 | 70Y | 500-0390 | 1 1/4" Rectangular, MT, Cermet |
| 752-208, 750-308 | 64W | 500-0192 | 3/8" Square, MT, Cermet, Top Adj |
| 753-100, 752-10 | 64P | 500-0170 | 3/8" Square, MT, Cermet, Side Adj |
| 780-10A, -12F | 63P | 500-0070 | 3/8" Square, ST, Cermet, Top Adj |
| 780-10AK, 780-12PK, 780-40XX | 63P-T607 w/Dial Knob | 500-0070 | 3/8" Square, ST, Cermet, Top Adj |
| 961-20 | 43P | 500-0001 | 3/4" Rectangular, ST, Cermet, Pins |
| 8400-XXX | 536-11-XXX | 502-0115 | 7/8" Dia., 10-Turn, Wirewound |
| 8403 | 533-1X-XXX | 502-0130 | 7/8" Dia., 3-Turn, Wirewound |
| 8405-XXX | 535-1X-XXX | 502-0145 | 7/8" Dia., 5-Turn, Wirewound |