Valves for the Racal RA17 and RA117 series
of H.F. Receivers by Andy Cowley, M1EBV |
The Racal RA17/117 series of valve/tube H.F. receivers evolved
considerably over its long production lifetime. More than 70
versions were produced. Not all versions, even of the same model,
used the same valve complement. In some cases substitution of
a valve from one set to another might cause damage to the valve
and the receiver - see warning. The tables below give the 'official' valve designations either from Racal or from British Military (NATO) manuals. 'NA' or 'C12' indicates a North American Model. Where the model designation is an active link, it leads to a table of equivalents. |
Jump down the page to RA117 series |
Valve Number |
Function | RA17 Mk2 | RA17L | RA17C12 |
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 |
Andy Cowley, M1EBV, 2002 |