{"id":102441,"date":"2025-06-25T19:59:35","date_gmt":"2025-06-25T11:59:35","guid":{"rendered":"https:\/\/soundglory.com\/?post_type=product&p=102441"},"modified":"2026-03-04T15:46:21","modified_gmt":"2026-03-04T07:46:21","slug":"mc240-110v","status":"publish","type":"product","link":"https:\/\/soundglory.com\/en\/product\/mc240-110v\/","title":{"rendered":"MCINTOSH MC240 110V (\u4e8c\u624b\uff0c7\u6210\u65b0)"},"content":{"rendered":"
\n

Rated Output Power<\/strong><\/p>\n

40 WPC (16.02 dBW) stereo into 4\u03a9, 8 \u03a9, 16\u03a9, 125\u03a9 (70.7V) \u00a0or 600\u03a9 (140V) from \u00a020-20,000 Hz with less than 0.5% THD.<\/p>\n

80 watts mono into 2\u03a9, 4\u03a9, 8\u03a9, 16\u03a9 or 32\u03a9 depending on output connections.<\/p>\n

This is a very serious output power specification, I know of no tube amplifier today that specifies output power at such a low level of distortion over such a huge frequency band. Modern high-end tube amplifiers lack the low-end guts of the McIntosh and can’t put out much power at all at these low distortion figures at low frequencies.<\/p>\n

Inputs<\/strong><\/p>\n

Three switch-selectable inputs, all 250 k\u03a9:<\/p>\n

MONO<\/strong><\/p>\n

One mono input jack with a level control.<\/p>\n

500mV minimum to 30V maximum input for rated output.<\/p>\n

TWIN<\/strong><\/p>\n

Two input jacks, each with its own level control.<\/p>\n

500mV minimum to 30V maximum input for rated output.<\/p>\n

STEREO<\/strong><\/p>\n

Two input jacks.<\/p>\n

No level control, but there is a balance control to fine-tune the system’s balance between the two channels.<\/p>\n

Level fixed at 2.0V input sensitivity for rated output.<\/p>\n

Frequency Response<\/strong><\/p>\n

16 ~ 40,000 cycles +0, -0.1 dB at rated power.<\/p>\n

16 ~ 60,000 cycles +0, -0.5 dB at rated power.<\/p>\n

10 ~ 100,000 cycles +0, -1.0 dB at half rated power.<\/p>\n

These again are serious specifications not matched today, even by McIntosh. Today’s tube amps cover a similar range, but at -3 dB.<\/p>\n

All other tube amplifiers, including new ones from McIntosh, have much sloppier specifications, and they certainly aren’t rated at full power.<\/p>\n

Phase Shift<\/strong><\/p>\n

\u00b1 6\u00ba 20 ~ 20,000 cycles.<\/p>\n

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

\u2265 90 dB below rated output.<\/p>\n

This is \u2264 -73.98 dBW or \u2264 566 \u00b5V or \u2264 -64.95 dBV.<\/p>\n

THD<\/strong><\/p>\n

< 0.5% from 20 ~ 20,000 cycles at rated power.<\/p>\n

\u2264 0.3% typical.<\/p>\n

IMD<\/strong><\/p>\n

< 0.5% for peak powers up to twice rated power for any two frequencies from 20 ~ 20,000 cycles.<\/p>\n

Damping Factor<\/strong><\/p>\n

> 10, regardless of selected output impedance.<\/p>\n

Output Connectors<\/strong><\/p>\n

Barrier block, 3\/8″ spacing for low impedance loads.<\/p>\n

Octal socket for high impedance loads.<\/p>\n

Tube Complement<\/strong><\/p>\n

(4) 6L6GC or 7027A for output.<\/p>\n

(3) 12AX7.<\/p>\n

(2) 12BH7.<\/p>\n

(2) 12AU7.<\/p>\n

Quality<\/strong><\/p>\n

Made in Binghamton, New York, USA.<\/p>\n

Construction<\/strong><\/p>\n

Sheet steel chassis.<\/p>\n

Power Input<\/strong><\/p>\n

105-130 VAC 50 ~ 60 cycles.<\/p>\n

Negative temperature coefficient thermistor for inrush current limiting for soft turn-on.<\/p>\n

Rated Power Consumption<\/strong><\/p>\n

145W at idle.<\/p>\n

270W at full power.<\/p>\n

3.2A slo-blo fuse.<\/p>\n

3A internal B+ fuse.<\/p>\n

See also\u00a0Actual Power Consumption.<\/a><\/p>\n

Size<\/strong><\/p>\n

8 x 10-3\/4 x 17-1\/2″ HWD.<\/p>\n

Weight<\/strong><\/p>\n

56 pounds.<\/p>\n

65 pounds as shipped.<\/p>\n<\/div>\n

<\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"

Rated Output Power 40 WPC (16.02 dBW) stereo into 4\u03a9, 8 \u03a9, 16\u03a9, 125\u03a9 (70.7V) \u00a0or 600\u03a9 (140V) from \u00a020-20,000 Hz with less than 0.5%…<\/p>\n","protected":false},"featured_media":102442,"template":"","meta":[],"pwb-brand":[],"product_cat":[502,524],"product_tag":[],"class_list":{"0":"post-102441","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-post-amplifier","7":"product_cat-used-equipmen-post-amplifier","8":"product_shipping_class-c-class","10":"first","11":"instock","12":"sold-individually","13":"shipping-taxable","14":"purchasable","15":"product-type-simple"},"aioseo_notices":[],"etheme_brands":{"errors":{"invalid_taxonomy":["Invalid taxonomy."]},"error_data":[]},"brands":[],"_links":{"self":[{"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product\/102441","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/types\/product"}],"version-history":[{"count":2,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product\/102441\/revisions"}],"predecessor-version":[{"id":122717,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product\/102441\/revisions\/122717"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/media\/102442"}],"wp:attachment":[{"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/media?parent=102441"}],"wp:term":[{"taxonomy":"pwb-brand","embeddable":true,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/pwb-brand?post=102441"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product_cat?post=102441"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/soundglory.com\/en\/wp-json\/wp\/v2\/product_tag?post=102441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}