過年前開個cheap箱 (Eastern Electric DAC Plus)

CKKeung

過年前開番個 cheap箱 for my CAS :
  

with Valvo "pinched waist" '收腰' E80CC

masteralain

Valvo金腳！

racewong

CK兄, 你都放左好多心機喺CAS喎!

chrisclw

Ching 呢支咩膽嚟呀?

chrisclw

Ching 呢支咩膽嚟呀?

CKKeung

那是一枝五六十代的 NOS Valvo "pinched waist"「收腰」E80CC。，但如有更舊的非金腳version 則更好。一一

tonyx

CKKeung 發表於 2011-12-31 23:21
那是一枝五六十代的 NOS Valvo 「收腰」E80CC。，但如有更舊的非金腳version 則更好。一一 ...

想請問師兄有無試過部mytek呢？

CKKeung

Mytek has balanced outputs and firewire input too.
However Mytek is more expensive and the chip (ESS9016) is of lower grade than EE DAC Plus (chip is ESS9018).
EE DAC Plus is also more playable because the opamps and tube are easily upgradeable.

chrisclw

CKKeung 發表於 2011-12-31 23:21
那是一枝五六十代的 NOS Valvo 「收腰」E80CC。，但如有更舊的非金腳version 則更好。一一 ...

ching, 請問呢支幾銀呀? 屬於咩聲底?

CKKeung

http://www.audiotubes.com/12au7.htm
"...E80CC:This unusual European tube is basically an industrial type 6085. However, it's specs are similar enough to a 12AU7 that audiophiles are grabbing them up while the prices are still reasonable. The heater life is rated at 10,000 hours, and some have gold pins. The larger box plate structure gives this tube low microphonics and silky smooth sonics. Some of the Philips Holland versions had the rare pinched waist, where the glass dips inward and actually molds around the top mica plate, giving the plates extra support and virtually eliminating microphonics. There is also a version made at the Amperex factory in Hicksville, NY, which is often priced lower but looks the same and sounds very similar to the Holland version. Since this tube has a much higher Gm and Mu factor than a 12AU7, the gain is going to be greater and this tube will give a more forward presentation. Awesome in phase splitter applications. If in doubt, check with your amp or preamp manufacturer to see if this tube will work OK in your application. This tube is also about twice as tall as a 12AU7, so installation space in your chassis is a consideration as well. These are out of production, rare, and getting very hard to find..."

http://www.myav.com.tw/bbs/showthread.php?threadid=30736&pagenumber=0
"... E80CC/6085 我只見過4種.
1. Philips Pinched Waist: 傳說中的寶貝, 一管難求, 金腳, 是Philips 荷蘭廠所製, 極早期的管子, 但一樣的東西有印成 Philips Miniwatt, Valvo, Siemens, Amperex. 此種最好.
2. Philips Holland: PVM碼為 VBx , 金腳, 6x-7x 年代, 廠牌也有很多, Valvo, Philips Miniwatt, Amperex, Siemens, Mullard, Telefunken, 都是一樣的東西, 喜歡 Telefunken & Mullard 的就多花一點錢買那些印刷.
音色較豐潤, 音樂性不錯, 如果是 D-getter且上面水銀塗成幾乎是黑色的那一種, 很棒!, 幾乎和 Pinched Waist的一樣好!
3. Tungsram: 匈牙利製, 銀白色的腳, 廠牌也不少, Tungsram, Siemens, Amperex, Philips 都有看過, 都是一樣的東西, 解析力一流, 喜歡聽細節的不可錯過, 但音色沒有 Philips 豐潤, 與 Philips 比起來, 無所謂誰比較好, 和器材搭配及個人口味有關.
4. National E80CC: 美國製, 管身較短, 只比一般 ECC82高一點點而已, 音色沒有聽過, 不過推測應該不怎麼樣... 不想當白老鼠...."

cyberken

E, 好靚仔，咩聲底呢？

CKKeung

cyberken hing,
ESS9018 chip's characters are high resolution, good 3D & big soundstage.  
Pinched waist E80CC's character is big dynamics yet musical so they should be a good match.
Still boiling.  Will report after 100-200 hours.

cyberken

CKKeung 發表於 2012-1-1 10:52
cyberken hing,
ESS9018 chip's characters are high resolution, good 3D & big soundstage.  
Pinched wa ...

等你

CKKeung

cyberken 發表於 2012-1-1 11:21
等你

My Eastern Electric DAC Plus is now about 50 hours.  Let's have some photos.
The interior with 2 transformers:.

All 4 opamps upgraded (from 5532 & 5534 to AD8599 & OPA627):

DigitalMana

Nice photos.

Looks like the USB solution is from M2Tech (HiFace).

You can try to put some Silmic caps (or some film cap, keep the leads short) directly across the V+ and V- of each opamp, helps quite a bit.