- #21 [mr,chan], 19-03-14 06:36好手工,犀利。
- #22 [billchan3388], 19-03-14 19:50鉑金的四牛連動TVC 比較以前的普通版更靚聲
- #23 [kit271], 19-03-15 08:09請問此牛的初級阻抗是多少?
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- #24 [billchan3388], 19-03-15 09:25I will check the input impedance with the supplier and put back here.
特點是完全沒有任何誤差問題,100%全平衡彼此也不會干擾,重點是推力極強可直接推後級無需再加前級放大電路,每格間級細膩好調,更重要是音質優美,頻寬特寬而且平直是真正能傳達最音色的利器! - #25 [billchan3388], 19-03-15 12:13輸入阻抗約兩佰k
- #26 [kit271], 19-03-16 10:55200k對牛來說真係好高,這不怕電感量嗎?
- #27 [羅密歐], 19-03-16 11:33200k確實高得不可思議,不知測量條件為何?
- #28 [billchan3388], 19-03-16 17:14200k major in 電感量 for balanced input
no resistor load, only the copper coil internal resistance
equal to 100k in RCA input,
higher input impedance load will be better for DAC
ouput voltage very low with very low impedannce
the property of pure transformer volume control
最後修改時間: 2019-03-16 17:18:49 - #29 [wontun], 19-03-16 18:07#20 請問這名揚tvc是四牛版的fully balanced嗎? 因在網上看到些類似的tvc是兩牛版的.
最後修改時間: 2019-03-16 18:12:15 - #30 [billchan3388], 19-03-16 18:39It is 4 autotransformers version and sound much better than
2 tx version,usually the output from DAC is 2~4Vac, but our normal
listening sound level for power amp input need only around 100mV
so TVC is the best equipment to step down the signal from few Volts
down to 100mV because the DAC high Volt with high impedance will
be changed to very low impedance low volt.
It is hard to believe until you hear yourself.
最後修改時間: 2019-03-16 18:41:01 - #31 [wontun], 19-03-16 22:42很想試fully balanced的tvc的聲音, 見名揚在網上賣的是兩牛版, 市面上fully balanced的tvc選擇好像不多, Audio Music R-S像是類似的結構.
最後修改時間: 2019-03-16 22:49:26 - #32 [wontun], 19-03-17 13:08#30
是的, 非常低的output impedance是tvc一大優點, 只要解決gain control的問題, 有足夠的動態開聲, 它的聲音是十分吸引. - #33 [kkfc123], 19-03-17 15:53請教,如果用有平衡輸出的CD player是否可以解決gain的問題?因為平衡輸出一般有4V而RCA只有2V。
- #34 [dkyyu], 19-03-17 17:37Dear c-hing,
My sharing.
I am using 5 audio source outputs today, namely:
1) Linn MC cartridge to Linn Linto phono amp, RCA output (2V?)
2) Sansui tuner, RCA outlevel set at 5.5 out of 10 scale
3) Marantz 10B, RCA full output
4) Linn Accurate SACD full balance xlr output (4V?)
5) vdv colibri/ Linn MC/ Denon Dl103R (full balance tonearm cable configuration) to Aqvox phono full balance xlr output (70db maximum gain by current amplification, not voltage amplification)
All 5 audio sources were connected to Music First Baby Reference TVC passive Pre. My TVC is configured with two output, one xlr and 1 RCA.
The xlr are connected to a pair of 70watt tube Graaf GM20 OTL monoblocks whle the rca was connected to 200W tube Graaf GM200 OTL.
The speakers in use are a pair of 86db sensitivity QUAD ESL63, occansionally switched to 81.5db LS3/5a 15ohm vintage.
All interconnectors and speaker cables are old Nordost and few Kimber Kcag/kctg.
All the above combinations present no gain problem at all. 10 out of 10 visitors never realsized they were listening to a passive pre system particularly the mighty 200 watt Graaf GM200 system.
HOpe that helps for your reference. - #35 [kkfc123], 19-03-18 10:25Thanks dkyyu for the sharing!
- #36 [dkyyu], 19-03-18 11:11I believe gain is rarely an issue,
1V to 2V is adequate to drive most of the normal systems in a normal listening room, providing you are not using speakers with sensitivity less than 83db
The key factor attributes to the dynamic department mainly depending on the quality of the TVC pre. I am afraid most of the passive pre, whether resistor base or TVC in today's market I have ever experienced failed in this area. There are exception few at higher price e.g. You have to go as far as to the Music First Baby Reference or Reference model.
Having said, I support the idea of best using the normal priced passive pre to match with some vintage tube amps usually known and described as "creamy and heavy" audio character. - #37 [Richcoln], 19-03-18 11:33CD播放機及解碼器的輸出並非問題所在,最重要的是能確保無源式前級的輸出阻抗在任何音量電平恆定不變。
- #38 [wontun], 19-03-18 12:18最近買了隻tvc, 交收時與賣家師兄聊天, 他説那隻tvc在他家中不夠生動, 還是喜歡有源前級.
我搬回家開聲反而十分喜歡, 沒有那位師兄的感覺.
當然不同組合環境有不同效果, 不同人對什麼是生動的要求也有所不同. - #39 [Richcoln], 19-03-18 12:26敢問那位師兄沿用的數碼訊源(CD唱機或解碼器)的輸出阻抗及功率放大器的輸入阻抗多少歐姆?
- #40 [wontun], 19-03-18 12:35貼上有關CD機的數據供參考, 至於後級有很多, 多是膽輸入, 有些是用6J5, 6J7, 6SN7等, 另外有些用輸入牛, 200ohm輸入阻抗, 請問如何衡量?
我只是普通用家, 對技術層面一窺不通, 請教了!
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