{"id":19503,"date":"2025-05-27T08:48:27","date_gmt":"2025-05-27T08:48:27","guid":{"rendered":"https:\/\/masteringmansion.com\/pro-audio\/?post_type=product&p=19503"},"modified":"2026-06-19T08:53:39","modified_gmt":"2026-06-19T08:53:39","slug":"model-86b-1","status":"publish","type":"product","link":"https:\/\/masteringmansion.com\/pro-audio\/categorias\/serie-500\/model-86b-1\/","title":{"rendered":"MODEL 86B-1"},"content":{"rendered":"
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An American-Style Mono Tube Preamp Designed for Versatility<\/span><\/span><\/h1>\n<\/div>\n
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From beautiful glowing vocals, natural acoustics and punchy drums to overdriven and saturated classic tube warmth, the 86B-1 preamplifier offers a huge sonic palette for engineers and producers to explore.<\/span><\/p>\n

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Rooted in 1950s American-style tube circuitry, the 86B-1 has a huge harmonic footprint and will<\/span> remedy what you’re missing from a lifeless modern signal chain.<\/span><\/p>\n

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TRANSFORMERS<\/span><\/h4>\n<\/div>\n
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Super Premium MuMetal shielded inputs and nickel & steel outputs set the stage<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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TUBES<\/span><\/h4>\n<\/div>\n
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An 6BR7 input tube and 12AY7 output tube amplify the signal with 75 dB of max gain<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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OUTPUT LEVEL LED<\/span><\/h4>\n<\/div>\n
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A 3-color LED indicator shows signal level.<\/span><\/p>\n

Green -> Yellow -> Red<\/span><\/p>\n

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Tubes, Transformers and an Amplifier Design You Will Love<\/span><\/p>\n<\/div>\n

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The 86B-1 is designed to get any amount of tube coloration into your audio easily. Its two-knob system allows the engineer to fine-tune the type of character needed. You can drive the 86B-1 and control the amount of tonal coloration in your audio. Save time with one preamp that can achieve a variety of sounds. <\/span><\/p>\n

\u200b<\/span><\/p>\n

Rounded out with features like a 20dB pad, 85Hz high pass, two mic input impedances and high impedance front panel DI, the 86B-1 won’t sit idle in your valuable rack space!<\/span><\/p>\n

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86B Lineage\u00a0<\/span><\/p>\n<\/div>\n

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Introduced in 2014 as a modernized version of the Ampex 601 \u00absuitcase tape recorder,\u00bb the Locomotive 286A (86B-1 & 86B-2 predecessor) showcased\u00a0several of the best attributes from the 601. A pentode and dual triode were a crucial part of the sound worth keeping. The 601 could sound so smooth, but also be pushed into full distortion due to its wild amount of gain. This was a great way to get a large amount of use out of one piece of gear. On the contrary, the 601 was never designed to be used with high-output mics, so it lacked input headroom and needed input padding much of the time.<\/span><\/p>\n

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Taking this into account, we designed the Locomotive 286A by using the Ampex 601 circuit and modified it for modern use. We also added all the important mic preamp features like phantom power, pad, polarity, low cut and DI.<\/span><\/p>\n

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TRANSFORMERS<\/span><\/h4>\n<\/div>\n
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Super Premium MuMetal shielded inputs and nickel & steel outputs set the stage<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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<\/div>\n<\/div>\n
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TUBES<\/span><\/h4>\n<\/div>\n
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An 6BR7 input tube and 12AY7 output tube amplify the signal with 75 dB of max gain<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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<\/div>\n<\/div>\n
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OUTPUT LEVEL LED<\/span><\/h4>\n<\/div>\n
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A 3-color LED indicator shows signal level.<\/span><\/p>\n

Green -> Yellow -> Red<\/span><\/p>\n

Click HERE<\/a> to see level-specific LED color<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

SEE ALL FEATURES AND SPECS<\/span><\/a><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n
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Tubes, Transformers and an Amplifier Design You Will Love<\/span><\/p>\n<\/div>\n

\n

The 86B-1 is designed to get any amount of tube coloration into your audio easily. Its two-knob system allows the engineer to fine-tune the type of character needed. You can drive the 86B-1 and control the amount of tonal coloration in your audio. Save time with one preamp that can achieve a variety of sounds. <\/span><\/p>\n

\u200b<\/span><\/p>\n

Rounded out with features like a 20dB pad, 85Hz high pass, two mic input impedances and high impedance front panel DI, the 86B-1 won’t sit idle in your valuable rack space!<\/span><\/p>\n<\/div>\n

<\/div>\n
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\n
\n
\n
\n

86B Lineage\u00a0<\/span><\/p>\n<\/div>\n

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Introduced in 2014 as a modernized version of the Ampex 601 \u00absuitcase tape recorder,\u00bb the Locomotive 286A (86B-1 & 86B-2 predecessor) showcased\u00a0several of the best attributes from the 601. A pentode and dual triode were a crucial part of the sound worth keeping. The 601 could sound so smooth, but also be pushed into full distortion due to its wild amount of gain. This was a great way to get a large amount of use out of one piece of gear. On the contrary, the 601 was never designed to be used with high-output mics, so it lacked input headroom and needed input padding much of the time.<\/span><\/p>\n

\n

Taking this into account, we designed the Locomotive 286A by using the Ampex 601 circuit and modified it for modern use. We also added all the important mic preamp features like phantom power, pad, polarity, low cut and DI.<\/span><\/p>\n

\u200b<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>\n<\/div>\n

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The following sound samples show the difference between 3 different Locomotive preamps when sent the same prerecorded line-level audio.<\/span><\/p>\n<\/div>\n

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Each preamp has been set to accept a line-level input. The WT-72 was set on LINE and at 36 dB gain. The 86B was set on LINE, and knobs were set for low gain and level matched to the WT-72. The 40AM was set at (HIGH) LINE unless otherwise noted on sound file.<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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A 500 Series Preamp with loads Sweet and Harmonic Tube Gain<\/span><\/h1>\n<\/div>\n
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Warm and Clean to Aggressive and Grungy\u00a0<\/span><\/span><\/p>\n<\/div>\n","protected":false},"featured_media":19504,"template":"","meta":[],"pwb-brand":[826],"product_brand":[],"product_cat":[1032],"product_tag":[828,971,841,842],"class_list":["post-19503","product","type-product","status-publish","has-post-thumbnail","pwb-brand-locomotive_audio","product_cat-serie-500","product_tag-locomotive-audio","product_tag-model-86b-1","product_tag-preamplificador-valvular","product_tag-stereo","first","onbackorder","taxable","shipping-taxable","purchasable","product-type-simple"],"brands":[{"id":826,"name":"LOCOMOTIVE AUDIO","slug":"locomotive_audio"}],"_links":{"self":[{"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/product\/19503","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/media\/19504"}],"wp:attachment":[{"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/media?parent=19503"}],"wp:term":[{"taxonomy":"pwb-brand","embeddable":true,"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/pwb-brand?post=19503"},{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/product_brand?post=19503"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/product_cat?post=19503"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/product_tag?post=19503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}