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| [#2342] Leak Club for Leakies or Leak users 咁快就傳千里? |
good 正式會員203.xxx.xxx.46 |
2004-07-12 17:28 | |
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| [#2343] Leak Club for Leakies or Leak users 上週末做魔童,現已變身如此(ST20),但今日於鴻光找不到Sprague 50uf 電溶,各位有否好介紹.  |
Mercedes 正式會員 203.xxx.xxx.27 |
2004-07-13 00:52 |
| [#2344] Leak Club for Leakies or Leak users 變身前  |
Mercedes 正式會員 203.xxx.xxx.27 |
2004-07-13 00:55 |
| [#2345] Leak Club for Leakies or Leak users Patrick It is tidy and neat. 100 full mark (my standard). Hope you get the vintage capacitors soon. John keung |
Gingers 正式會員 221.xxx.xxx.165 |
2004-07-13 01:37 |
| [#2347] Leak Club for Leakies or Leak users .  |
Gingers 正式會員 221.xxx.xxx.200 |
2004-07-13 09:34 |
| [#2348] Leak Club for Leakies or Leak users Wow.... Another Sifu emerged......! "上週末做魔童,現已變身如此(ST20),但今日於鴻光找不到Sprague 50uf 電溶,各位有否好介紹." You can try Big Chu. I have a few Sprague 47uf (those in Ginger's one with red band) if you need them very desperately. I got them sometime ago in Max. Wonder if it had run out of stock. Or you may also try other quality caps. |
lym 正式會員 167.xxx.xxx.10 |
2004-07-13 10:12 |
| [#2349] Leak Club for Leakies or Leak users Wow.... Another Sifu emerged......! -------------- Don't play me la, lym hing. I just learn from all the high hands here. I will go to Big Chu and have a look later. Thanks. |
Mercedes 正式會員 203.xxx.xxx.42 |
2004-07-13 11:45 |
| [#2350] Leak Club for Leakies or Leak users .  |
Gingers 正式會員 221.xxx.xxx.201 |
2004-07-13 20:50 |
| [#2351] Leak Club for Leakies or Leak users Have put back the main board onto the chassis but found that the voltage difference between C4 & C6 (the 0.25uf TCC coupling) becomes bigger. Before was 206V vs 195V and 203V vs 198V Now is 208V vs 158V and 210V vs 172V Is it normal for such reading? |
Mercedes 正式會員 203.xxx.xxx.180 |
2004-07-14 02:18 |
| [#2352] Leak Club for Leakies or Leak users Patrick, "Before was 206V vs 195V and 203V vs 198V Now is 208V vs 158V and 210V vs 172V" Try these: a) Swap the two tubes between channels to see if the voltage differences go with the particular tubes. One of the tubes 12AX7 tubes could have non-matching between the 2 halves. b) Check if the resistors have drifted in value after they were soldered onto the component broad? This can happen for some unstable A&B resistors and when the soldering process was a bit too long in time. c) +/-10 to +/-20% of voltages of the channels could be regarded as normal for most vintage amps. But of course +/-0 to +/-5% makes you feel happier. Good Luck! r |
rcwy 正式會員 221.xxx.xxx.250 |
2004-07-14 09:33 |
| [#2353] Leak Club for Leakies or Leak users Patrick, Try and check any leakage on 0.1uF cap... Raymond |
*DIY* 正式會員 203.xxx.xxx.217 |
2004-07-14 11:15 |
| [#2354] Leak Club for Leakies or Leak users Try and check any leakage on 0.1uF cap... ------ Raymond, how to check for leakage? Voltage across the cap is zero? |
Mercedes 正式會員 203.xxx.xxx.42 |
2004-07-14 11:57 |
| [#2355] Leak Club for Leakies or Leak users Mercedes "how to check for leakage? Voltage across the cap is zero?" BLACK and RED poles of your multi-metre to GOUND and stage which 0.1 coupled respectively.. |
dd845 正式會員 203.xxx.xxx.25 |
2004-07-14 12:02 |
| [#2356] Leak Club for Leakies or Leak users "BLACK and RED poles of your multi-metre to GOUND and stage which 0.1 coupled respectively.." And the reading is better if less than 0.5V (my standard)..^___^ |
dd845 正式會員 203.xxx.xxx.25 |
2004-07-14 12:05 |
| [#2357] Leak Club for Leakies or Leak users "And the reading is better if less than 0.5V (my standard)..^___^" I am told that several voltages read was OK..＞_____＜ but I disgreed!! |
dd845 正式會員 203.xxx.xxx.25 |
2004-07-14 12:06 |
| [#2358] Leak Club for Leakies or Leak users typo"I am told that several voltages read was OK..＞_____＜ but I disagreed!! |
dd845 正式會員 203.xxx.xxx.25 |
2004-07-14 12:09 |
| [#2359] Leak Club for Leakies or Leak users Swap the two tubes between channels to see if the voltage differences go with the particular tubes. ------- 12AX7 tubes exhanged, but problem still exists |
Mercedes 正式會員 218.xxx.xxx.104 |
2004-07-14 22:47 |
| [#2360] Leak Club for Leakies or Leak users 12AX7 tubes exhanged, but problem still exists.. ---------------------------------------------- Patrick, What do you mean by this? The set of voltages go with the tubes OR fixated at the particular positions in the circuit? Read the steps I posted carefully and experiment with the steps one by one. r |
rcwy 正式會員 221.xxx.xxx.250 |
2004-07-14 22:52 |
| [#2361] Leak Club for Leakies or Leak users "BLACK and RED poles of your multi-metre to GOUND and stage which 0.1 coupled respectively.." And the reading is better if less than 0.5V (my standard).. ------------------------------------------ I am afraid those guys talking about measuring the residual voltages at the grid of the power tube may NOT understand how to. Ask them the question: Why below 0.5V is normal? r |
rcwy 正式會員 221.xxx.xxx.250 |
2004-07-14 22:55 |
