Martel fax-100
  One of the smallest tube receivers of those years. The smallest, however, did not mean poor, because it had 14 lamps in its construction and had many structural elements of larger equipment. The only thing he lacked was a turntable RIAA preamplifier with a magnetoelectric cartridge, additional filters, such as "loudness", and a headphone jack. Except that Martel did not offer headphone outputs in each of its tube amplifiers. FAX 100 it was the so-called "full" tube. 6CA4 / EZ81 duodiode power supply, EAA duodiode FM demodulation. Other Martel receivers used semiconductor demodulation diodes in the FM circuit. The FAX-100 shared a power amplifier with the FAX 150C model. The drivers were based on the 12AX7 / ECC83 tubes and the power tubes were 6BQ5 / EL84. Loudspeaker output for 8 ohm load only. The radio track is a no-compromise structure. FM head with the range of 88-108 MHz on the 6AQ8 / ECC85 tube, and a three-inter-stage amplifier 10.7 MHz allowed good and selective FM reception. The "magic eye" tube of the Japanese design 6R-E13 served as a tuning indicator. The whole device was complemented by a decoder on two 6BQ5 / ECC85 tubes and one 6BA6 / EF93. The stereo reception was indicated by the glow of a neon lamp. The receiver also enabled reception in the AM range of 650-1400 kHz reffered as medium waves

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