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Sawtooth oscillator (T427E)
Relaxation oscillator using a Thyratron (T426E)
Amplifier stage with the 6AL7 (T425E)
Magic eye test (T424E)
Oscillator and mixer (T423E)
6SA7 oscillator (T422E)
Pentagrid converter (T421E)
Audio detector and amplifier (T420E)
Full wave diode detector (T418E)
Detector with amplifier (T417E)
Detector diode (T416E)
Grid leak detector (T415E)
2-tube amplifier (T414E)
1V6 stage (T413E)
Low voltage stage (T412E)
Amplifier stage with the T411E (T411E)
Power stage (T409E)
Audio stage with pentode (T408E)
Pentode voltage amplifier (T407E)
Pentode RF Amplifier (T406E)
Stage for inductive loads (T405E)
Pentode amplifier stage (T404E)
Stage with tetrode (T403E)
Tube voltage regulator (T402E)
RF Amplifier 955 (T400E)
Amplifier stage with PJ8 (T399E)
Filament source (T398E)
6SN7 cascode amplifier (T397E)
Bootstrap 6F5 Amplifier (T396E)
Cathode follower 6SF5 (T395E)

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