[en] In order to obtain the double digital spread in high resolution nuclear spectrometry, two biased amplifiers were linked in parallel mode to the 10 V-input of a 2k-ADC. The arrangement works like a hybrid (1 bit scale - 11 bits Wilkinson) converter. A careful adjustment of the two bias levels (approximately 0V and approximately 6V) and the post-amplification (approximately 2) delivered a good linearity of the 4k-spectrum. (author)