{"id":18257,"date":"2023-10-13T11:59:41","date_gmt":"2023-10-13T11:59:41","guid":{"rendered":"https:\/\/masteringmansion.com\/pro-audio\/?post_type=product&p=18257"},"modified":"2026-07-08T11:32:14","modified_gmt":"2026-07-08T11:32:14","slug":"bock-251","status":"publish","type":"product","link":"https:\/\/masteringmansion.com\/pro-audio\/categorias\/microfonos\/bock-251\/","title":{"rendered":"Bock 251"},"content":{"rendered":"
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Reach Sonic Nirvana<\/span><\/p>\n

The UA Bock 251 is our flagship large-diaphragm tube condenser mic, giving you the smooth, open tone of the iconic ELAM 251,* considered by many to be the greatest vocal mic ever made. Each microphone is handmade in Santa\u00a0Cruz, California, to the exacting specifications of world\u2011renowned mic designer\u00a0David\u00a0Bock.<\/span><\/p>\n

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Add Handmade Magic to your Studio<\/span><\/p>\n

The UA Bock 251 is David\u00a0Bock’s loving interpretation of the classic 251 microphones he studied and maintained as chief technical engineer of the world’s top recording studios for two decades. Handbuilt at UA\u2019s Custom Shop in Santa Cruz, California, the UA\u00a0Bock\u00a0251 mic puts \u00abgolden\u00a0unit\u00bb sound at the heart\u00a0of\u00a0your\u00a0recordings. <\/span><\/p>\n

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Rich Tube Mic\u00a0Sounds, with Updated\u00a0Sonics<\/span><\/p>\n

With its German-made CK12 capsule and large output transformer, the\u00a0UA\u00a0Bock\u00a0251 gives you extended low\u2011frequency response down to 10\u00a0Hz and higher SPL capabilities versus vintage 251\u00a0microphones.<\/span><\/p>\n

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Built for a Lifetime of Harmonious Recording<\/span><\/p>\n

Handwired using premium components, each UA Bock 251 is built and tested to David Bock’s exacting specifications. With its vintage-inspired case, robust shock mount and accessories, this mic spares no expense to last a\u00a0lifetime.<\/span><\/p>\n

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Large-diaphragm tube studio condenser mic, lovingly handmade at the UA Custom Shop in Santa Cruz, California<\/h2>\n<\/div>\n
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Iconic, \u00abgolden unit\u00bb mic sounds with modern enhancements by David Bock<\/h2>\n<\/div>\n
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Switchable omnidirectional, cardioid, and Figure-8 polar patterns<\/h2>\n<\/div>\n
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German-made CK12 capsule and Cinemag transformer<\/h2>\n<\/div>\n
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Frequency Response: 10 Hz – 18 kHz, \u00b1 2 dB<\/h2>\n

Max SPL: 118 dB SPL, 1% THD<\/h2>\n

NOS ECC85 tube<\/h2>\n

Requires included UA Bock 251 PSU true linear power supply<\/h2>\n
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Premium vintage-style suitcase<\/p>\n

Features<\/p>\n

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Polar Pattern<\/p>\n

Switchable Omnidirectional, Cardioid, and Figure-8<\/p>\n

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Capsule<\/p>\n

1\u201d diameter
\nDual asymmetrical backplate
\nDual diaphragm CK12 type<\/p>\n

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Tube<\/p>\n

New Old Stock ECC85<\/p>\n

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Maximum SPL<\/p>\n

118 dB SPL, 1% THD<\/p>\n

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Adjustable
\nControls<\/p>\n

Polar pattern selector<\/p>\n

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Frequency
\nRange<\/p>\n

10 Hz – 18 kHz +\/- 2 dB<\/p>\n

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Sensitivity<\/p>\n

-34 dB (19 mV) ref 1V at 1 Pa, 1 kHz<\/p>\n

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Output
\nImpedance<\/p>\n

150 Ohms<\/p>\n

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Recommended
\nLoad
\nImpedance<\/p>\n

1.2K Ohms<\/p>\n

\n
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Dynamic
\nRange<\/p>\n

100 dB<\/p>\n

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Signal-to-Noise Ratio<\/p>\n

76 dB<\/p>\n

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Power<\/p>\n

UA Bock 251 PSU true linear, 115V (default) or 230V operation<\/p>\n

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Connectors<\/p>\n

Tuchel (mic), 3-Pin XLR (power supply)<\/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<\/div>\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<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Tube Condenser<\/span><\/p>\n","protected":false},"featured_media":18258,"template":"","meta":[],"pwb-brand":[230],"product_brand":[],"product_cat":[1028],"product_tag":[477],"class_list":["post-18257","product","type-product","status-publish","has-post-thumbnail","pwb-brand-universal-audio","product_cat-microfonos","product_tag-universal-audio","first","outofstock","sale","taxable","shipping-taxable","purchasable","product-type-simple"],"brands":[{"id":230,"name":"UNIVERSAL AUDIO","slug":"universal-audio"}],"_links":{"self":[{"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/product\/18257","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\/18258"}],"wp:attachment":[{"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/media?parent=18257"}],"wp:term":[{"taxonomy":"pwb-brand","embeddable":true,"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/pwb-brand?post=18257"},{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/product_brand?post=18257"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/product_cat?post=18257"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/masteringmansion.com\/pro-audio\/wp-json\/wp\/v2\/product_tag?post=18257"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}