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| [#16932] Leak Club for Leakies or Leak user This was the second CD I listened this morning. A mono recording recording in 1939 & 1940 (even older than my Leak TL/12 Point One) respectively, featuring two violinists Neveu http://en.wikipedia.org/wiki/Ginette_Neveu and Hassid http://en.wikipedia.org/wiki/Josef_Hassid After listening to the CDs, I would think the GOd sometimes really jealous genius :-(  |
Gingers 正式會員221.xxx.xxx.25 |
2007-10-19 11:10 | |
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| [#16933] Leak Club for Leakies or Leak user Gingers, I'm glad you like Neveu. Her Brahms and Beethoven concertos are equally fascinating. With a pair of good ESL, I'm sure you will come to enjoy more of the old and mono recordings. The tone isn't hard and although the soundstage is not as good as stereo, they usually have very good layering. But with the tone so natural, you just immerse yourself in the music and forget about the others. With my brief listening of the 25A with the ESL, I'm sure my bet is still winning.  |
cpsjj 正式會員 218.xxx.xxx.233 |
2007-10-19 12:43 |
| [#16934] Leak Club for Leakies or Leak user Everything about Ginette Neveu. I tried hard in vain to get her recording of the Beethoven concerto with Barbirolli, the performance after which she rushed to call her mother that she had for the first time been able to express all that she felt about that score.  |
cpsjj 正式會員 219.xxx.xxx.169 |
2007-10-19 16:40 |
| [#16935] Leak Club for Leakies or Leak user 原來裘千丈与裘千仞是同胞攣生兄弟，幼時兩人性情容貌，全無分別。 到十三歲上，裘千仞無意之間救了鐵掌幫上官幫主的性命。那上官幫主感恩圖報，將全身武扒吇n相授。裘千仞到得二十四歲時，奶珖尋有青出于藍之勢，次年上官幫主逝世，臨終時將鐵掌幫幫主之位傳了給他。 裘千仞非但武白a人，而且极有才略，數年之間，將原來一個小小幫會整頓得好生興旺，自從“鐵掌殲衡山”一役將衡山派打得一蹶不振之后，鐵掌水上飄的名頭威震江湖。 當年華山論劍，王重陽等曾邀他參預。裘千仞以鐵掌神巧|未大成，自知非王重陽敵手，故而謝絕赴會，十余年來隱居在鐵掌峰下閉門苦練，有心要在二次論劍時奪取“武奶悀U第一”的榮號。 -------------------------------- 肥鵝山論劍 東邪 ~ 桃紅 Audiomaster Type 11A 西毒 ~ Leak TL/12 'Point One' 老毒物 南帝 ~ RCA LMI-32216 正氣 北丐 ~ Leak TL/50+ 中神通 ~ Leak TL/25A 'Point One' 鐵掌水上飄 ~ Radford STA25 III  |
Gingers 正式會員 221.xxx.xxx.66 |
2007-10-19 18:05 |
[#16936] Leak Club for Leakies or Leak user  |
Gingers 正式會員 221.xxx.xxx.66 |
2007-10-19 18:07 |
| [#16937] Leak Club for Leakies or Leak user One of my favourite CDs for violin pieces :-)  |
Gingers 正式會員 221.xxx.xxx.111 |
2007-10-19 18:30 |
[#16938] Leak Club for Leakies or Leak user  |
Gingers 正式會員 221.xxx.xxx.111 |
2007-10-19 18:31 |
| [#16939] Leak Club for Leakies or Leak user Brothers Beware of this :-( Can I file a complaint with the Consumer Council? John  |
Gingers 正式會員 221.xxx.xxx.111 |
2007-10-19 18:44 |
| [#16940] Leak Club for Leakies or Leak user what happened? how's that possible? |
ck2005 正式會員 203.xxx.xxx.223 |
2007-10-19 21:01 |
| [#16941] Leak Club for Leakies or Leak user ck2005 The sponge-like 'Protector' melt like M&M choclate in one's mouth :-( Take care. John |
Gingers 正式會員 221.xxx.xxx.111 |
2007-10-19 21:08 |
| [#16942] Leak Club for Leakies or Leak user Can I file a complaint with the Consumer Council? --------------- No, but to yourself perhaps, for not listening to the CD for ages. Foam cannot last long. |
rcwy 正式會員 221.xxx.xxx.224 |
2007-10-19 21:44 |
| [#16943] Leak Club for Leakies or Leak user John, Yours wasn't too bad. I had an Missiah set of CD that I left in Australia for ten years. Last year when I took it back to Hong Kong and found the paint goes into the CD and distroy the Aluminium foil inside and that makes the CD not playable anymore. So long with the myth that CD lasts forever! |
yukclee 正式會員 219.xxx.xxx.73 |
2007-10-19 22:11 |
[#16944] Leak Club for Leakies or Leak user  |
Gingers 正式會員 221.xxx.xxx.111 |
2007-10-19 23:17 |
| [#16945] Leak Club for Leakies or Leak user YC May I know whether you have restored your 12.1? John :-) |
Gingers 正式會員 221.xxx.xxx.111 |
2007-10-19 23:17 |
| [#16946] Leak Club for Leakies or Leak user 也來油罐.  |
ck2005 正式會員 218.xxx.xxx.113 |
2007-10-20 00:36 |
| [#16947] Leak Club for Leakies or Leak user CK2005 This one before?? John  |
Gingers 正式會員 221.xxx.xxx.223 |
2007-10-20 08:26 |
| [#16948] Leak Club for Leakies or Leak user Yes. John hing.But your version appears to be KT88 while my original one is 8417, a tube no longer produced. Basically, QS 8417 amp is not bad taking into account of quality transofrmers. However, the two blue high mu caps are always the fatal killer to the life of the two 5AR4 rectifiers. As such, it is suggested to replace the filerting caps. Adjustment to the power tube sockets could also be made in order to fit in other power tubes such as those more popular one like EL34, KT88 or my favourite 7027A. My amps now use two 10u oil caps as filtering caps. 5U4G as recitifers, free to choose among KT88, EL34 or 7027A power tubes. It's real dynamic with a lot of punches, able to produce VG soundstage. I enjoy it very much. Ned Carlson has the following suggestion to mod the amp: Well, here's my little paper on how to convert QS to 6550, etc, so you can decide for yourself whether it's too complex for you or not. I suspect the folks that claim that it's too difficult are the same ones selling 8417 for $200 a pair or charging megabucks a pair to modify these amps. The drive requirements for 6550, etc are different but well with the capabilities of the driver tube (eg I've built Mk3 Dyna mod using single 12AU7 as driver, there's other examples out there). Many of these note apply to other amplifiers using 8417. Quick Fix for Quicksilver Amplifiers The general circuit looks like it was borrowed piecemeal out of a Bogen MO-100 PA amp (not a bad place to start, actually). These amps have problems with output tube instability due to unnecessarily high grid circuit resistors on the 8417 tubes, and occasional arcing over of the 5AR4 rectifier tubes due to the input capacitor being 3 times the maximum size allowed according to the tube specifications. The manufacturer uses 1 each of 12AX7 and 12AU7 (or 12BH7) tubes, but only uses half of each tube, the other half just sits there and does nothing. NOTE: Unplug the amp AND discharge 320 uF filter capacitors (you can use a screwdriver between the terminals of the capacitor, if charged you WILL get a spark!) prior to proceeding with any work inside the amplifier. 1. This mod will allow amplifiers originally equipped with Sylvania or Philips ECG 8417 tubes to use the GE made 8417 without unnecessary instability. A. Find the 150K resistors connected to pin 5 of the 8417 sockets. Replace with 47K. The actual value is not too critical but the resistors should be matched to 2% or better (preferably better). B. Change the coupling capacitors to .47 uF at 600V or similar. The originals were too low of a voltage rating (400V, should have been 600V) If bias drift on the GE 8417's is still excessive, the resistor values may be made as low as 22K. In that case change coupling caps to 1.0 uF 2. This mod will allow use of either 8417, KT88 or 6550 tubes (probably EL34's as well although we haven't tried it.) A. Change bias potentiometer to 33K or 47K. B. Change resistor between bias pot and bias diode to 10K. C. Optionally, capactior in bias circuit may be increased (up to 220 uF) to replace original 60 uF 150V part. D. Set the pots to full negative, install output tubes and rebias as usual. Note that if bias won't stay stable you may have to replace 150K grid resistors with lower value (100K or in extreme cases 47K) (as noted above connected to pin 5 of 8417 socket). Defective tubes can cause the same problem, generally symptom of this is that one amp will set bias and other won't. Chinese tubes in particular are most likely to have this problem, I've heard people having sucess with these by setting bias to half the usual current. Note that if tubes other than 8417's are used, it may be preferable to make the feedback adjustable by installing a 1K or 500 ohm pot in series with a 100 ohm resistor to replace the original 562 ohm resistor, then adjusting feedback to taste. If 6550/KT88/EL34 will be only tubes, simply replace with (approximately) 270 ohms. Resistors and pots should be 1 watt parts. 3. This mod allows setting bias with a voltmeter instead of a milliammeter. A. Install a 10 ohm (1/4 watt minimum) 1% resistor across the bias jack terminals. Now the voltage will correspond to the number of milliamps drawn across this resistor when jack is inserted. 1 volt=100 ma, 1.2 = 120 ma, etc. 4. (optional) This mod will allow more voltage drive and lower output impedence of 12AU7 or 12BH7 driver tube. (DNA to amps using 7247/12DW7 tube) A. Install jumper between pins 1 and 6 of 12AU7 socket. B. Install jumper between pins 2 and 7 of 12AU7 socket. C. Install jumper between pins 3 and 8 of 12AU7 socket. The phase spliiter resistors can be made any value from 22K to 47K (as low as 15K with 12BH7) ohms, so long as they're matched. Won't hurt to experiment with different values, so long as you're careful to get everything hooked back up right. Note that if this mod is performed, a tube with relatively well balanced sections is preferable. 5.(optional) This mod will parallel sections of 12AX7 tube. (not applicable to amps using 7247/12DW7) A. Find 330K ohm resistor attached to 12AX7 socket. Change to 150K. B. Find the 820 ohm resistor attached to 12AX7 socket. Change to 390 ohms. C. Install jumpers (as noted above) between pins 1 and 6, pins 2 and 7, and pins 3 and 8, on the 12AX7 socket. D. Operate amplifier and measure voltage drop between plate and cathode of 12AU7 tube. This should be in range of 100 to 150 volts. If too low, decrease the value of the 390 ohm resistor (attached to the 12AX7) until it voltage falls in range. If way too high (say over 200 volts), increase the value of the 390 ohm resistor. Note that if this mod is performed, a tube with relatively well balanced sections is preferable. If you don't like the way it sounds, just undo these instructions. 6. This mod will allow adjustment of input impedence to better match preamps with a high output impedence (example- Dyna PAS3 or PAS2) A. Find the 100K resistor between the input jack and ground. Replace with higher value (between 220K and 500K, whatever sounds best..Dyna units seem to be happiest with 470 or 475K in my experience). Optionally, a 470 K or 500K pot could be installed to make input impedence adjustable, attach center lead of RCA jack to wiper (center terminal), and either end to ground. Pot should be linear taper. 7. This mod will eliminate 5AR4 arcing over problems. If arcing hasn't been a problem, you can probably skip it. Don't forget to discharge the 320 uF caps first! A. Disconnect both leads of the choke. B. Wire the positive terminals of the 320 uF capacitors together. C. Disconnect the wire leading from 5AR4's to the 320 uF capacitor. In place of the wire, connect the choke leads. Choke polarity is not important. D. Connect a 500V electrolytic capacitor (any value from 22 to 100 uF should do fine) between the cathode of either of the 5AR4's (pin 8) and ground (center tap of power transformer primary). Make sure you have polarity of electrolytics correct (positive end goes to 5AR4 cathode!) E. Many people have reported good results using GZ37/CV378 tube in place of 5AR4, these have higher PRV and peak current ratings than 5AR4 7. This is mod suggested in Sound Practices. Apparently will reduce IM distortion, altho at cost of slightly lower power output. A. Disconnect screen lead from pin 4 of output tube (8417,6550,or KT88,etc). Connect to pin 6. (assuming pin 6 is empty. If not install a small terminal strip and connect screen lead to ungrounded lug. B. Install 80V, 5watt zener diode between pin 6 (or terminal lug) and pin 4. Banded end (cathode) must be connected to lead from transformer! Happy soldering.... Ned Carlson Triode Electronics, Chicago |
ck2005 正式會員 203.xxx.xxx.87 |
2007-10-20 09:06 |
| [#16949] Leak Club for Leakies or Leak user CK Hope to have a chance to listen to your set up :-) John |
Gingers 正式會員 221.xxx.xxx.223 |
2007-10-20 09:23 |
| [#16950] Leak Club for Leakies or Leak user John Hing, My Door's always open if you don't mind my gears are nothing comparable to yours. The audition environment here in Sheung Shui DSQ is much more desirable than Shun Lee DSQ. At least I can place bigger speakers. |
ck2005 正式會員 203.xxx.xxx.87 |
2007-10-20 09:30 |
| [#16951] Leak Club for Leakies or Leak user CK Please check PM. John |
Gingers 正式會員 221.xxx.xxx.223 |
2007-10-20 09:54 |
