{"id":173797,"date":"2023-11-01T12:19:36","date_gmt":"2023-11-01T12:19:36","guid":{"rendered":"https:\/\/www.techweekmag.com\/?p=173797"},"modified":"2023-11-01T13:25:29","modified_gmt":"2023-11-01T13:25:29","slug":"classic-audio-spartan-15-mm-phono-stage-from-michael-fiedler","status":"publish","type":"post","link":"https:\/\/www.stereoindex.com\/tech\/hi-fi\/classic-audio-spartan-15-mm-phono-stage-from-michael-fiedler\/","title":{"rendered":"Classic Audio Spartan 15: MM phono stage from Michael Fiedler"},"content":{"rendered":"

The British company\u00a0Classic Audio<\/b>\u00a0introduced a new phono stage in the Spartan series –\u00a0Spartan 15<\/b>\u00a0, which became a logical continuation of the successful two-stage phono stage for working with moving magnet (MM) heads Spartan 10 – the company’s debut model, released in 2021.<\/p>\n

Handcrafted in Kent, England, the\u00a0SPARTAN 15<\/b>\u00a0phono preamp uses Japanese 2068 op-amps specifically matched to the impedance of the MM cartridge, delivering a record-breaking 78dB signal-to-noise ratio for a phono preamp.\u00a0Very accurate RIAA equalization (to within 0.1 dB) is achieved by using 1% tolerance film capacitors to eliminate the coloration and channel balance issues associated with more common designs.<\/p>\n

\"MM<\/p>\n

The SPARTAN 15 phono preamplifier is equipped with a 3rd order infrasonic filter to prevent unpleasant infrasonic intermodulation distortion in speaker systems.\u00a0The polypropylene film capacitors in the filter are hand-selected during assembly to achieve consistent filter performance without the characteristic low frequency inconsistencies associated with lesser quality filters.\u00a0There is a switch to mono mode on the front panel, which can significantly reduce noise and distortion when playing monaural recordings.<\/p>\n

\"MM<\/p>\n

Like its predecessor, the popular SPARTAN 10 phono preamplifier, it uses an original two-stage amplification circuit to achieve a gain of 110 for a 1 kHz signal (40.8 dB).\u00a0As a result, it was possible to achieve very low SOI (0.0006%) in the range from 40 Hz to 22 kHz.\u00a0The input signal can reach 95 mV at 1 kHz without causing overload.<\/p>\n

\"MM<\/p>\n

The linear power supply uses highly reliable Panasonic electrolytic capacitors with precision reference diodes and an external transformer, which allows you to reliably isolate the phono circuit from external electromagnetic interference.\u00a0Using a linear power supply provides much better isolation from the mains than switching power supplies.\u00a0Also implemented here is a circuit for shutting off the output signal when turning the phono stage on and off, based on a Panasonic relay, which allows you to protect subsequent system components from transient processes.<\/p>\n

\"\u00a0<\/p>\n

The Classic\u00a0<\/b>Audio\u00a0<\/b>SPARTAN 15<\/b>\u00a0phono preamplifier\u00a0is housed in a sandblasted anodized aluminum body and is available in black or silver finishes.\u00a0The new product is already on sale – the phono stage can be ordered directly from the manufacturer.\u00a0UK RRP\u00a0\u00a3330<\/b>\u00a0.\u00a0In EU countries, SPARTAN 15 will be offered for\u00a0400 euros<\/b> , and in the US you will have to pay\u00a0450 dollars<\/b>\u00a0for the new product .<\/p>\n","protected":false},"excerpt":{"rendered":"

The British company\u00a0Classic Audio\u00a0introduced a new phono stage in the Spartan series –\u00a0Spartan 15\u00a0, which became a logical continuation of the successful two-stage phono stage for working with moving magnet (MM) heads Spartan 10 – the company’s debut model, released in 2021. Handcrafted in Kent, England, the\u00a0SPARTAN 15\u00a0phono preamp uses Japanese 2068 op-amps specifically matched […] More<\/a><\/p>\n","protected":false},"author":10404,"featured_media":173803,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[642],"tags":[779],"class_list":["post-173797","post","type-post","status-publish","format-standard","has-post-thumbnail","category-hi-fi","tag-news"],"acf":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/posts\/173797","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/users\/10404"}],"replies":[{"embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/comments?post=173797"}],"version-history":[{"count":0,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/posts\/173797\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/media\/173803"}],"wp:attachment":[{"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/media?parent=173797"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/categories?post=173797"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.stereoindex.com\/tech\/wp-json\/wp\/v2\/tags?post=173797"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}