| Valve
Number |
Function | RA17 Mk2 | RA17L | RA17L NA |
| 1 | Crystal Oscillator | CV138 | CV138 | 6AU6 |
| 2 | Harmonic Generator | CV138 | CV138 | 6AU6 |
| 3 | R.F. Amplifier | CV3998 | CV5331 | 6ES8 |
| 4 | Harmonic Mixer | CV2209 | CV2209 | 6AS6 |
| 5 | First V.F.O. | CV138 | CV138 | 6AU6 |
| 6 | 37.5 Mc/c Amplifier | CV138 | CV138 | 6AU6 |
| 7 | First Mixer | CV3998 | CV3998 | 6688 |
| 8 | 37.5 Mc/s Amplifier | CV138 | CV138 | 6AU6 |
| 9 | Second Mixer | CV3998 | CV3998 | 6688 |
| 10 | 37.5 Mc/s Amplifier | CV138 | CV138 | 6AU6 |
| 11 | Third Mixer | CV453 | CV4012 | 6BE6 |
| 12 | Second V.F.O. | CV138 | CV138 | 6AU6 |
| 13 | Divider/Mixer | CV453 | CV4012 | 6BE6 |
| 14 | First I.F. Amplifier | CV454 | CV454 | 6BA6 |
| 15 | Multiplier | CV454 | CV454 | 6BA6 |
| 16 | Second I.F. Amplifier | CV454 | CV454 | 6BA6 |
| 17 | I.F. Output | CV454 | CV454 | 6BA6 |
| 18 | A.V.C. and T.C. | CV140 | CV140 | 6AL5 |
| 19 | B.F.O. | CV138 | CV138 | 6AU6 |
| 20 | Power Rectifier | CV378 | CV1377 | _ |
| 21 | Detector and Noise Limiter | CV140 | CV140 | 6AL5 |
| 22 | A.F. Outputs (Local) | CV138 | CV138 | 6AQ5 |
| 23 | A.F. Output (Remote) | CV138 | CV138 | 12AT7 |
| 24 | Clamping Diode | _ | CV469 | _ |
| Valve
Number |
Function | RA117 | RA117 NA |
| 1 | Crystal Oscillator/Amplifier | CV4010 | 6AK5W |
| 2 | Harmonic Generator | CV4010 | 6AK5W |
| 3 | R.F. Amplifier | CV5531 | 6ES8 |
| 4 | Harmonic Mixer | CV4011 | 6AS6 |
| 5 | First V.F.O. | CV4009 | 6BA6 |
| 6 | 37.5 Mc/c Amplifier | CV4009 | 6BA6 |
| 7 | First Mixer | CV3998 | 6688 |
| 8 | 37.5 Mc/s Amplifier | CV4009 | 6BA6 |
| 9 | Second Mixer | CV3998 | 6688 |
| 10 | 37.5 Mc/s Amplifier | CV4009 | 6BA6 |
| 11 | Second V.F.O. Amplifier | CV4010 | 6AK5W |
| 12 | Second V.F.O. | CV4024 | 12AT7 |
| 13 | Calibrator | CV4012 | 6BE6W |
| 14 | First I.F. Amplifier | CV4009 | 6BA6 |
| 15 | Calibrator | CV4009 | 6BA6 |
| 16 | Second I.F. Amplifier | CV4009 | 6BA6 |
| 17 | I.F. Output | CV4009 | 6BA6 |
| 18 | A.V.C. and T.C. | CV4007 | 6AL5 |
| 19 | B.F.O. | CV4010 | 6AK5W |
| 20 | none | _ | _ |
| 21 | Detector and Noise Limiter | CV4007 | 6AL5 |
| 22 | A.F. Output | CV4019 | 6AQ5 |
| 23 | A.F. Amplifier and Output | CV4024 | 12AT7 |
| 24 | Clamping Diode | CV469 | 5704 |
| 25 | Third Mixer | CV3998 | 6688 |
| 26 | Fourth Mixer | CV4012 | 6BE6W |
| 27 | 1.7 Mc/s Crystal Oscillator and Amplifier | CV4010 | 6AK5W |