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[擴音機/組合] User Review - Dynaco Stereo 70 Tube Power Amp

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發表於 2013-11-13 07:45:42 | 顯示全部樓層 |閱讀模式
本帖最後由 auraheart 於 2013-11-13 17:49 編輯

The Dynaco Stereo 70 tube power amp is an affordable classic !  They are the best selling amps in Hi Fi history.  It is also ranked #1 by the Absolute Sound as the world's most significant power amp of all time.  The ST 70 could be found anywhere in the world.  From audiophiles home to junk yard.  If you are very lucky, you might pick one up next to nothing.  Well, happened to me for $35 USD, almost new and excellent working condition.
Please check out my previous post on the technical aspect of the ST 70:   
www.141hongkong.com/thread-1266232-1-1.html

Stereo 70

Stereo 70


The sound of the ST 70 is quite satisfactory in general.  It rather laid back, warm, and somehow, reminds me of some older Mcintosh.  It has been called as poor men's Mcintosh for years.  It is known for it 3 dimensional rendition.  Clear mid-range, pretty much what a good tube amp suppose to do.  Perfect for some classical, jazz, easy listening in general.  The ST 70 doesn't have ideal responses at either end of the spectrum (hi, low). Partly because it is a low price amp using marginal parts to cut cost.  There wasn't anything wrong with it's design.  It has so much potential waiting to be discovered by simply using better parts and alter the circuits, just a bit.

Modified ST 70

Modified ST 70


After modification (see my previous post), test drive the ST 70 with the Wharfedale E70 speakers.  If it were a blind test, I would say that was a Marantz 8b.  It completely got away from the shadow of the Mcintosh.  No more laid back and easy, just like added a turbo lol..  Great dynamics from the softest to the loudest level of music, no choking and not kidding.  Seems like it opened up the entire spectrum, especially at both extreme ends.  A bit surprised, hum and noise were inaudible.  Well defined bass (very surprise, its a tube amp), can feel the dbl bass player's finger strength, and guitar player's too.  Was the very first time I heard/felt produced by the ST 70, my jaw almost dropped. Vocals were clean, it wasn't like there was a layer between singer and listener, just wide open.  It even enhanced the 3 dimensional effect which I like meaning wider and deeper sound stage.  It was much quicker, more airy, nice and warm sounding as well.  All in all, the biggest improvements were both top and low end.  Depth of bass, layers of wave at the lower region and crispy, crystal clear harmonics of the highs.  $10.00 USD for parts and three days of work, was very profitable to my ears, lol... Can enjoy the Stereo 70 for hours and hours.  I am looking forward to kicking Marantz 8B's arse when time comes to replace the new tubes, my favorite Chinese EL 34 tubes.

Fat boy tube

Fat boy tube

It only costed me $45.00 USD for the Stereo 70 including new parts.  You never know what you get in to lol...sometimes flea market, junk yard, used stores, even pawn shops, you may find something nice.

The matching pre-amp was Dynaco PAS-3X tube pre amp(latest model).  Paid $25 USD, but I spend a whole year looking for good stuff and bought 5 pieces including the world famous Marantz 7C & 7T from the flea market...got up 5am in the morning, no kidding !  It was at least the same condition as below, maybe a bit better, was mint !  It was once every two weeks for a year..to look for good gears cheap.

PAS 3X Tube Pre amp

PAS 3X Tube Pre amp





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發表於 2013-11-13 08:50:23 | 顯示全部樓層
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發表於 2013-11-13 08:57:56 | 顯示全部樓層
一睇就知........................貴
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發表於 2013-11-13 09:00:15 | 顯示全部樓層
半圓木座好精巧
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發表於 2013-11-13 09:01:40 | 顯示全部樓層
倫有 發表於 2013-11-13 08:57
一睇就知........................貴

幾草美龍
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發表於 2013-11-13 09:04:46 | 顯示全部樓層
我好 naive 係咪無間道過D?
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發表於 2013-11-13 09:13:24 | 顯示全部樓層
似玩具多D...
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發表於 2013-11-13 09:14:42 | 顯示全部樓層
回復 cableitoh #6 的帖子

吾系,無間道果D系陀地或北姑,里个鬼妹黎
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發表於 2013-11-13 09:16:32 | 顯示全部樓層
sl1 發表於 2013-11-13 09:14
回復 cableitoh #6 的帖子

吾系,無間道果D系陀地或北姑,里个鬼妹黎

哦!! 明白了!!
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 樓主| 發表於 2013-11-13 09:21:49 | 顯示全部樓層
本帖最後由 auraheart 於 2013-11-13 09:37 編輯
柒喜 發表於 2013-11-13 08:50
個個木座手工好靚仔幾草美龍又真係抵到爛


Haha...at flea market, the base alone probably 30 to 50 美龍..pretty cheap.  At store is different story.  Could be a few hundred.
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發表於 2013-11-13 09:26:43 | 顯示全部樓層
auraheart 發表於 2013-11-13 09:21
Haha...at flea market, the base alone probably 30 to 50 美龍..pretty cheap.  At store is different ...

乜有好多呢類木座賣既咩
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 樓主| 發表於 2013-11-13 09:31:01 | 顯示全部樓層
本帖最後由 auraheart 於 2013-11-13 09:32 編輯
柒喜 發表於 2013-11-13 08:50
個個木座手工好靚仔幾草美龍又真係抵到爛


I build an all FET pre-amp for my brother in law using an Acrylic Case---crystal clear, see through with chrome control knobs, was very beautiful.  We cut the acrylic board and glued it piece by piece.  No screws except a few to secure the main board and transformers (2).
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 樓主| 發表於 2013-11-13 09:34:28 | 顯示全部樓層
本帖最後由 auraheart 於 2013-11-13 10:33 編輯
柒喜 發表於 2013-11-13 09:26
乜有好多呢類木座賣既咩


Nah...some carpenters do it as hobby and sell cheap at the flea market.  Got to know where to go. For wood, it is north..just across the golden gate bridge in marin county, I think.  For electronics, it in Mountain View in Santa Clara County down south.  We have everything here, a big country, things scattered all over.  I hate to drive a hundred miles or more just wanted something small lol... Hong Kong is a lot better..
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發表於 2013-11-13 09:40:33 | 顯示全部樓層
auraheart 發表於 2013-11-13 09:31
I build an all FET pre-amp for my brother in law using an Acrylic Case---crystal clear, see throug ...

亞加力,我十幾年訂造幾個蓋用黎蓋住遊戲機,全無接合點,師父用熱力將亞加力弄曲成型,每個二百港幣
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發表於 2013-11-13 09:43:14 | 顯示全部樓層
auraheart 發表於 2013-11-13 09:34
Nah...some carpenters do it as hobby and sell cheap at the flea market.  Got to know where to go.  ...

買野都去左一日
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 樓主| 發表於 2013-11-13 09:44:24 | 顯示全部樓層
柒喜 發表於 2013-11-13 09:40
亞加力,我十幾年訂造幾個蓋用黎蓋住遊戲機,全無接合點,師父用熱力將亞加力弄曲成型,每個二百港幣

We couldn't bend that, was thick..hehe.  We made tunnels, just like wood and glued that.  Top cover was slide open.  Pretty cute.
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發表於 2013-11-13 09:46:48 | 顯示全部樓層
手工一流!
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 樓主| 發表於 2013-11-13 09:51:56 | 顯示全部樓層
本帖最後由 auraheart 於 2013-11-13 09:53 編輯
柒喜 發表於 2013-11-13 09:43
買野都去左一日


Yes, specially on this Dyanaco project.  I spend more time shopping than actual working on it.  When it was done, it was more less looked like the top picture.  Better, I think.  For Cosmetics, I had someone to engraved the letters, so they were permanent.  So beautiful, I would never sell that other than gave it away as gift.  I took it slowly, the whole thing was done in about a month.  Only required 2 to 3 days of work but for shopping and cosmetics, took much longer
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發表於 2013-11-13 09:57:32 | 顯示全部樓層
auraheart 發表於 2013-11-13 07:45
The Dynaco Stereo 70 tube power is an affordable classic !  They are the best selling amp in the Hi  ...

專家
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發表於 2013-11-13 09:59:19 | 顯示全部樓層
auraheart 發表於 2013-11-13 07:45
The Dynaco Stereo 70 tube power is an affordable classic !  They are the best selling amp in the Hi  ...

個樣好靚wor               
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