三級燈絲穩壓,到貨了! - DIY天地 - HiFi Fever

發表於 2006-1-31 01:07:34

Casper 發表於 2006-1-31 12:43:57

Re: 三級燈絲穩壓

Kit Sir,

Would you be able to make available to us the PCB Board and the additional components like LM317 - the components that we don't already have?

Thanks
Paul

發表於 2006-1-31 13:16:48

Casper 發表於 2006-1-31 13:24:00

Calling all students from Second Class GG Pre-amp

Kit Sir, OK.

Hi all fellow students from 2nd class - lets all attend and see if this new board with independent IC to handle each tube filament voltage regulation will improve the sound. Remember bring money. Ha Ha.

Paul
如果04/02有時間的話,2:00-6:00,在apm 1505室,試聽完先想買唔買,信我不如信自已的耳!

why 發表於 2006-2-1 11:53:03

SIZE 是否一樣?

KITS,

新穩壓的PCB板SIZE是否與舊板一樣?價錢多少?
望告!謝!

mmw88 發表於 2006-2-1 12:29:44

我.....我要 Kit Sir

我......我要.........
我要一塊
請留一塊給我好嗎？
:lol:

發表於 2006-2-1 23:07:11

Casper 發表於 2006-2-5 22:00:13

Re: 聽先比買!哈哈!

Kit Sir,

How's the AB comparison with the individual filament regulator board? I didn't manage to join 04/02 session and miss the comparison and want to know whats the verdict. Should we all get a board??

Paul

發表於 2006-2-5 23:40:34

mmw88 發表於 2006-2-6 11:04:27

試聽過後

我在上星期六的課堂巳試聽過，
感覺上在各方面有很大的改善，
大家同學們也可以考慮買來試試，
其實價錢也不是太高的呢！

Kit Sir 請問何時齊料可以賣給我啊？
多謝回覆。

senderj 發表於 2006-2-6 18:39:59

I haven't follow the group to the new place. Can somebody tell me how much is it?

mmw88 發表於 2006-2-6 19:54:27

Kit Sir 快快快

Kit Sir :

快些安排入齊貨了，
我們很心急要買呀！

:lol::lol::lol:

hcheung 發表於 2006-2-7 21:32:33

我認為用3A穩壓IC(如LT1085,LM350及MC78T12等)會好些.因為如果用E82CC等12AU7代用胆,因燈絲電流比較大,穩壓IC會很熱.

我現在用Mullard E82CC,3組獨立燈絲穩壓(MC78T12),每組AC12V 1.5A輸入,散熱器溫度大約50度C

請看看這裡

http://www.tomsun.org/?hcheung

發表於 2006-2-8 00:06:53

hcheung 發表於 2006-2-8 00:55:07

Kit哥,

我唔係話聲音好壞,而係講穩壓IC過熱問題.E82CC燈絲比12AU7大食,LM317未必頂得住.LM350可能會好一點.

計數時間:

12V AC 過橋式 = 17V DC, 共 5V降壓. 700mA一枝 = 3.5W

根據LM317 datasheet, junction to case thermal resistance = 5C/W, 即是 junction temperature 比 ambient 高 17.5度

用12AU7 (150mA) 的話, junction temperature = ambient + 4, 無問題

我現在用78T12, 插12AU7就大約35度左右,插E82CC就大約50度左右.

有一點我認同的是燈絲用LT1085或LM317聲音無分別

發表於 2006-2-18 00:01:52

william 發表於 2006-2-18 01:30:24

第一個 - 1 set pls!

PepLo 發表於 2006-2-27 08:51:22

Hi akitla,

I am new to this forum, would you kindly inform whether I can buy this 三級燈絲穩壓 ?I am very interest to get one for my GG.

Many thanks.

發表於 2006-2-27 21:42:10

PepLo 發表於 2006-2-28 08:52:29

Will call you this afternoon.Thanks.

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