{"id":247,"date":"2008-06-13T00:42:34","date_gmt":"2008-06-12T16:42:34","guid":{"rendered":"http:\/\/127.0.0.1\/wordpress63\/?p=247"},"modified":"2013-03-29T19:31:29","modified_gmt":"2013-03-29T11:31:29","slug":"mr-chang-diy-extraordinaire","status":"publish","type":"post","link":"https:\/\/diyparadise.com\/w\/mr-chang-diy-extraordinaire\/","title":{"rendered":"Mr. Chang DIY Extraordinaire"},"content":{"rendered":"

Mr. Chang<\/span><\/b><\/p>\n

DIY Extraordinaire<\/span><\/b><\/h2>\n

 <\/p>\n

It’s not very often that I meet a
\nDIY extraordinaire like Mr. Chang here. His work puts many commercial amps to
\nshame…<\/span><\/p>\n

\"\"<\/a>\u00a0\u00a0\u00a0\u00a0<\/span><\/p>\n

This is a tube preamp based on a
\nSansui circuit. It has phono functions in addition to tone controls, loudness
\nswitch etc. Beautiful eh? If you click on the picture, you’ll be rewarded with a
\nbetter view. Check out the silkscreen…\u00a0<\/span><\/p>\n

 <\/p>\n

\"\"<\/a>\u00a0\u00a0\u00a0\u00a0<\/span><\/p>\n

Aha! A Dynaco ST70 clone! A switch
\nin front allows the user to select between different driver tubes, as used in
\ndifferent generations of ST70. The voltage and current gauge is used to monitor
\nthe bias of the EL34s. The switch on the right selects which output tube you
\nwant to monitor! Currently using JJ E34L tubes.\u00a0<\/span><\/p>\n

 <\/p>\n

\"\"<\/a>\u00a0\u00a0\u00a0\u00a0<\/span><\/p>\n

I actually promised Mr. Chang I
\nwill build this circuit before passing over to him but too much work got to me
\nand before I knew it, Mr. Chang got it built! Circuit can be viewed on Projects<\/a>
\npage. Circuit is 5842 driving 2A3, SE of course. The tiny output transformers at
\nthe rear are Hammond 125ESEs. They might be a little tiny for a 2A3 but
\nlistening is believing! Give me this amp any day over commercial amps! As you
\ncan see, Mr. Chang took extra steps to enclose the power trans, Hammond 10H
\nchoke and the 125ESEs.\u00a0<\/span><\/p>\n

The attention to detail is
\nunbelievable!\u00a0<\/span><\/p>\n

Great craftsmanship!<\/span><\/p>\n

Way to go!\u00a0<\/span><\/p>\n

Great job!\u00a0<\/span><\/p>\n

Well done!\u00a0<\/span><\/p>\n

You certainly inspire me!<\/span><\/p>\n

 <\/p>\n

 <\/p>\n

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

Mr. Chang DIY Extraordinaire   It’s not very often that I meet a DIY extraordinaire like Mr. Chang here. His work puts many commercial amps to shame… \u00a0\u00a0\u00a0\u00a0 This is a tube preamp based on a Sansui circuit. It has phono functions in addition to tone controls, loudness switch etc. Beautiful eh? If you click on the picture, you’ll be rewarded with a better view. Check out the silkscreen…\u00a0   \u00a0\u00a0\u00a0\u00a0 Aha! A Dynaco ST70 clone! A switch in front allows the user to select between different driver tubes, as used in different generations of ST70. The voltage and current <\/p>\n","protected":false},"author":1,"featured_media":388,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[6],"tags":[1424,1581],"class_list":["post-247","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn-learn-learn","tag-mr-chang","tag-tube-amp","has_thumb"],"yoast_head":"\nMr. Chang DIY Extraordinaire - diyparadise<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/diyparadise.com\/w\/mr-chang-diy-extraordinaire\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mr. Chang DIY Extraordinaire - diyparadise\" \/>\n<meta property=\"og:description\" content=\"Mr. Chang DIY Extraordinaire   It’s not very often that I meet a DIY extraordinaire like Mr. Chang here. His work puts many commercial amps to shame… \u00a0\u00a0\u00a0\u00a0 This is a tube preamp based on a Sansui circuit. It has phono functions in addition to tone controls, loudness switch etc. Beautiful eh? If you click on the picture, you’ll be rewarded with a better view. Check out the silkscreen…\u00a0   \u00a0\u00a0\u00a0\u00a0 Aha! A Dynaco ST70 clone! A switch in front allows the user to select between different driver tubes, as used in different generations of ST70. 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