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| [#1] Technics SU-300MC - crackle and static noise hihihiiiiiiiiiiiiiiiiii looking for troubleshooting suggestion it is a DC battery power MC stage -Technics SU-300MC it has loud crackle..static noise cleaned all the connector and the relay..etc.. different battery...different RCA..etc..still Crackle..static..noise what else i should look into....... etc.. recap ? haha thxxxxxxxxxxxxxx  最後修改時間: 2021-05-03 19:20:59 |
hahayanyan 正式會員49.xxx.xxx.115 |
2021-05-03 19:20 | |
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| [#2] Technics SU-300MC - crackle and static noise 有沒有受潮, 發毛. 曾經有一機要拆卸下前面晶體管, 再徹底清潔晶體管腳與腳間地方, 之後正常了. |
hk888 正式會員 210.xxx.xxx.44 |
2021-05-07 14:12 |
| [#3] Technics SU-300MC - crackle and static noise 冇發毛.... 但一定受過潮 Haha... 我買曬啲cap.. Not yet arrive.. 等我一陣間試下你講嘅嘢 Thxx Haha |
hahayanyan 正式會員 49.xxx.xxx.232 |
2021-05-07 14:19 |
| [#4] Technics SU-300MC - crackle and static noise Haha  |
hahayanyan 正式會員 49.xxx.xxx.129 |
2021-05-07 17:49 |
| [#5] Technics SU-300MC - crackle and static noise those are the NPN transistor used.............. i suppose i can test it on the board by B＞C, and B ＞E a by diode test can i test it on the board? i jsut did some measurements..and i get some strange result..haha.....all seem goes bad... how come? haha  最後修改時間: 2021-05-07 18:19:12 |
hahayanyan 正式會員 49.xxx.xxx.129 |
2021-05-07 18:08 |
| [#6] Technics SU-300MC - crackle and static noise Seem some of the transistor seem bad... If it is a replacement... Which brand etc.. Has better sound..? Haha |
hahayanyan 正式會員 49.xxx.xxx.220 |
2021-05-07 20:49 |
| [#7] Technics SU-300MC - crackle and static noise seem 2 of the SVTM47LP are bad................................ which is used for the MC AMP parts.......... and cannot find replacement..haha |
hahayanyan 正式會員 49.xxx.xxx.200 |
2021-05-08 00:06 |
| [#8] Technics SU-300MC - crackle and static noise haha seem no luck for finding the SVTM47 i look at a few DIY design, there are similar design which use those Q1 or Q4 at the input stage hope there is one good SVTM47 is still good...........so i can measure the HFE and get a better match..haha haha...also thx to hk888 for some suggestion too.. haha  最後修改時間: 2021-05-08 12:03:51 |
hahayanyan 正式會員 49.xxx.xxx.215 |
2021-05-08 11:40 |
| [#9] Technics SU-300MC - crackle and static noise 建議用這個，low noise，動圈放大專用。 https://www.littlediode.com/components/2SA991.html  |
羅密歐 正式會員 182.xxx.xxx.126 |
2021-05-08 12:06 |
| [#10] Technics SU-300MC - crackle and static noise 羅密歐.....................thxxxxxxxxxxxx dummy question... "Does Brand of those Transistor " really matter? ...as i just check..Taobao does not have NEC 2SA991 haha ..where i can get those NEC low noise..... High class MC application too....... haha.............. also looking at 2N3799 Motorola (metal can...look so high class. hahaha.) https://www.datasheets360.com/part/detail/2n3799/7651678775153697444/ 2SA 970 Toshiba https://www.datasheets360.com/pdf/-2262243666460842475?query=2SA%20970%20Toshiba&pqid=108480905 最後修改時間: 2021-05-08 12:28:49 |
hahayanyan 正式會員 49.xxx.xxx.215 |
2021-05-08 12:18 |
| [#11] Technics SU-300MC - crackle and static noise 2SA991是非常舊的管，早已停產，因此供應商不會多。如不想跟littlediode買，只可買一推拆機管回來，再挑選合格的來用。 |
羅密歐 正式會員 182.xxx.xxx.126 |
2021-05-08 12:25 |
| [#12] Technics SU-300MC - crackle and static noise 2SA970建議用KTA1268代用，或買拆機管。 |
羅密歐 正式會員 182.xxx.xxx.126 |
2021-05-08 12:33 |
| [#13] Technics SU-300MC - crackle and static noise 羅密歐 happy to buy from anywhere, just nicer if i can get that from taobao..haha seem NO luck for NEC made 2SA991 haha thxxxxxxx especially from the info u given "low noise..and for high class MC stage" i love that technics prepre seem some KEC KTA1268 AROUND.. too...... 最後修改時間: 2021-05-08 12:35:35 |
hahayanyan 正式會員 49.xxx.xxx.215 |
2021-05-08 12:34 |
| [#14] Technics SU-300MC - crackle and static noise 2N3799 Mouser有售。 |
羅密歐 正式會員 182.xxx.xxx.126 |
2021-05-08 12:35 |
| [#15] Technics SU-300MC - crackle and static noise 2N3799 Mouser --made by Central Semiconductor also taobao have those too.......... sound like a choice too i suppose that 3799 seem higher noise than the 2SA991 u suggested ..something to learn today..haha haha thxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx another dummy question 可買一推拆機管回來，再挑選合格的來用 if i buy a few 2SA991 拆機管回來.................. what parameter i need to measure in order for " 合格" 最後修改時間: 2021-05-08 12:46:04 |
hahayanyan 正式會員 49.xxx.xxx.215 |
2021-05-08 12:37 |
| [#16] Technics SU-300MC - crackle and static noise 2SA991本來就是跟2SC1844配對的，見#9。 SVTM47LP可能只是個暫編號，因為網上資料極少，真身後來改了個正式編號2SA991。(純屬我個人猜想)  |
羅密歐 正式會員 182.xxx.xxx.126 |
2021-05-08 13:05 |
| [#17] Technics SU-300MC - crackle and static noise oh..yes..it sort of mentioned seem no fancy looking metal can to be used... and i should try to look for few 2SA991 拆機管...... or from littlediode thxxxxxxxxxxxxxxxxx thxxxxxxxxxxxx 要學到更細心去睇資料 Thx thx thx 每日 學多一點點係好重要  最後修改時間: 2021-05-08 13:14:06 |
hahayanyan 正式會員 49.xxx.xxx.215 |
2021-05-08 13:11 |
| [#18] Technics SU-300MC - crackle and static noise is about trust or no trust..too haha  |
hahayanyan 正式會員 49.xxx.xxx.215 |
2021-05-08 13:17 |
| [#19] Technics SU-300MC - crackle and static noise #18 國產管價錢低廉，一試亦無妨，反正損失不大。只要是正常的BJT，它無論如何也是會工作的，只是noise未必如原裝真品那麼低。 |
羅密歐 正式會員 182.xxx.xxx.126 |
2021-05-08 13:25 |
| [#20] Technics SU-300MC - crackle and static noise seem at least no harm to trouble shoot...purpose....not for hifi sounding purpose lower S/N etc..is not expected from those China unknown made PNP BJT as that technics i having now..is not little noise.. it has super loud Crackle POPOPOPOP Noiseeeeeeeeeeeeeee and i also need to double check some Diode today toooooooooooooooooooooooooooooo haha funnnnnnnnnnnnnnnnnnnnn 最後修改時間: 2021-05-08 13:41:23 |
hahayanyan 正式會員 49.xxx.xxx.215 |
2021-05-08 13:28 |
