#DET 25 #MARCONI VALVE #TUBE #DET25 #TRIODE #BRITISH #LAMPE #CV 1025 #DHT #MWT #MOV The DET25 transmitting triode has a large square four pin base as can be seen from the picture it is directly equivalent to CV1025. The anode box is quite large and blackened to radiate heat more effectively. Operating frequency would be in the HF range and probably the output power was of the order of 36 Watts. The filament is made of tape and is formed into a double inverted V. The tensioning springs can be seen to the right Side. Also in the picture the etched type description is typically of M-OV pattern and thus we can be sure of the manufacturer. The wide glass tube envelope is 51 mm in diameter and, excluding the L4 base pins, is 150 mm tall. Sensibly equivalent to: AT 35 - CV 1025 - VT 25 # PERFECT FOR PRE-AMPLIFIER HI-END TUBE VALVE LAMPE AMPLIFIER PRE AMPLIFIER PREAMP HAM RADIO Röhre TRANSMITTING SENDER SENDED tube valve lampe röhre tsf 진공관 真空管 HAM RADIO audio hi-end hi-fi diy POWER AMPLIFIER Pre-Amplifier Preamp Pri stereo SE Single Ended PP Push-Pull