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[#28] 膽前有hum #26 It's imperative to warm up the tube before applying high voltage B+, not nessarily related to signal input. Otherwise stripping off the cathode. That's why a standby position before putting on position. Tube data book shows the maximum cap. value to be connected. Somewhat 16uF for GZ34 etc. |
alexanderkoo![]() 14.xxx.xxx.127 |
2021-02-09 13:17 | |
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[#27] 膽前有hum Hum sound very annoying. Must turn up volume to try before buying. If not, you will regret it later big time. |
ovator![]() 138.xxx.xxx.245 |
2021-01-29 15:18 |
[#26] 膽前有hum 假若開機1分鐘之後就冇hum 我會主力諗係燈絲嘅問題 第一可能係未熱身嘅時候燈絲攞嘅current 比較大啲而引致power supply overload 第二可能係未熱身嘅時候真空管有filament to cathode leak (漏電) 咁就要試吓膽前級放大部份換晒所有真空管,最好用完全唔同牌子嘅真空管 另外唔知部膽前級輸出部份有冇1M 電阻落地,如果冇可以考慮加返,因為如果膽前級輸出位置完全開路冇落地,訊號線會比較容易受噪音干擾 不過一部膽前級需要1分鐘時間嚟穩定,冇乜嘢唔正常。就算冇噪音,師傅教落,膽機最好比幾分鐘時間熱身先至好行訊號,啲真空管壽命會長啲 最後,我都想知膽整流之後大水塘幾多uF? 因為膽整流唔可以用太大uF 數嘅大水塘,否則開機嘅時候overload 得好犀利, 都可以起Hum |
Thanatos![]() 168.xxx.xxx.100 |
2021-01-29 14:54 |
[#25] 膽前有hum 我都碰上過一部膽 phono, 總之插咗上去唔開機.. Have ground hum... But solved by lifting that ground |
hahayanyan![]() 49.xxx.xxx.220 |
2021-01-29 12:41 |
[#24] 膽前有hum 但係奇怪在冇開膽前級都有hum, 應該唔關膽前級嘅電容事 |
Thanatos![]() 168.xxx.xxx.100 |
2021-01-29 11:31 |
[#23] 膽前有hum 你這個經驗很有參考價值haha 令我回想起 我有一套很複雜嘅 結他系統, a few tube guitar amp, many looper..any effects pedals, processors... 都有這個問題搞咗好耐 有否試過power amp, 不經過這個power plant.. 是否會更好 sound? Or it is really better for the power amp go through the power plant? 你個系統組合好似好有趣可否分享一下? Haha 最後修改時間: 2021-01-29 11:26:43 |
hahayanyan![]() 49.xxx.xxx.220 |
2021-01-29 11:22 |
[#22] 膽前有hum 其實hum聲好大機會來自膽前,由其燈絲供電火牛的0v位有做升壓 最後修改時間: 2021-01-29 07:48:14 |
kit271![]() 182.xxx.xxx.48 |
2021-01-29 07:47 |
[#21] 膽前有hum 唔好意思呀各位師兄,試咗兩晚,又ground lift又換訊號線又換整流膽,始終都係無改善,最後就係將部獨立電源搬到遠離後級最遠個位,依家開機時都會有hum,但run大約1分鐘就慢慢減弱到再無hum,我估係電容嘅residue?但總算係解決咗問題,真係要感激各位師兄幫忙俾咁多建議我,真係令小弟好感動,再次多謝各位師兄相助,俾我知道hifi路上並唔係我一個人獨行,多謝大家!! |
karfso![]() 14.xxx.xxx.123 |
2021-01-29 01:50 |
[#20] 膽前有hum any luck ? |
hahayanyan![]() 49.xxx.xxx.240 |
2021-01-28 14:38 |
[#19] 膽前有hum may be u need to lift the ground of the XLR from the DAC to the SS preamp.....never know but back to basic----- step 101... this pre amp with the power amp only--- step one step 2...is adding the SS pre amp step 3 is adding the DAC..etc.. then add one piece at a time..., until u find out the culprit... no choice ..if those noise appeared... and u had try that approach.. one by one.. is suggested only take u one hour..and then all cable will be tidy up too..haha 最後修改時間: 2021-01-27 11:35:30 |
hahayanyan![]() 49.xxx.xxx.189 |
2021-01-27 11:27 |
[#18] 膽前有hum 唔好客氣,我都在此吸收緊經驗 我仲講留咗一樣野,我以前玩Graaf GM200 後級, 部機都係可以用XLR 或者RCA 輸入,用RCA 輸入嘅時候,XLR 冇入訊號嗰隻腳要用一隻 U 形腳 short落地,目的就係要減低XLR 空置左嘅輸入點帶嚟嘅噪音 期望你今晚拆除左後級XLR 輸入嗰兩條線,可以解決到問題 |
Thanatos![]() 168.xxx.xxx.100 |
2021-01-27 11:00 |
[#17] 膽前有hum 不知噪音如何,會否是線問題?試換對訊號線試下。 |
koalaau![]() 45.xxx.xxx.182 |
2021-01-27 02:12 |
[#16] 膽前有hum setup 1個獨立供電同部膽前已分離都有hum,所以感覺上能量來自後級經,聽晚會試吓甩凈膽前同石後再報告各師兄,謝謝大家幫忙! |
karfso![]() 14.xxx.xxx.55 |
2021-01-27 02:02 |
[#15] 膽前有hum 不過我都想再問一次,Setup 1 是否Tube pre 處於關機狀態都有hum? |
Thanatos![]() 168.xxx.xxx.100 |
2021-01-27 01:49 |
[#14] 膽前有hum Setup 1 試吓飛起Solid state pre to power amp 嗰一對XLR 訊號線 其餘所有sources 照樣接駁到膽前級 |
Thanatos![]() 168.xxx.xxx.100 |
2021-01-27 01:37 |
[#13] 膽前有hum 多謝咁多位師兄俾意見,可能我文字表達得唔好,所以畫咗幅圖希望可以清楚啲話俾各師兄了解,謝謝大家! ![]() |
karfso![]() 14.xxx.xxx.55 |
2021-01-27 00:38 |
[#12] 膽前有hum But u did mention such things happens even with the pre amp was switched off...off mean completely off without standby? Does this preamp have standby mode? I have a phono stage... Only have ground hum with one preamp.. But not the other.. I am lucky.. It was solved by lifting the ground with that phono with that preamp.... Good luck 最後修改時間: 2021-01-26 22:47:25 |
hahayanyan![]() 49.xxx.xxx.147 |
2021-01-26 22:44 |
[#11] 膽前有hum 如果未着機都有hum (樓主講嘅未着機係咪講緊新加入嘅前級?) 真係似ground loop 多啲 不過都要注意新加入嘅前級嘅分體電源及其電源線有沒有放得好近訊號線 最後修改時間: 2021-01-26 22:50:18 |
Thanatos![]() 168.xxx.xxx.100 |
2021-01-26 22:42 |
[#10] 膽前有hum 前級輸入接駁咗幾多部source? 試吓逐個掹走睇吓會唔會冇咗hum 如果淨係其中一個source 駁左先至會有hum,咁就前級落地,引致問題嗰個source飛起水線 |
Thanatos![]() 168.xxx.xxx.100 |
2021-01-26 22:28 |
[#9] 膽前有hum Stupid question... U sure it is hum but not other noise.. Such as tube noise.. Etc..? U only connect preamp to power amp and to speaker.. Without any sources? Then.. If u still believe it is hum... Lift the ground of the power amp and put back the ground of the pre amp.... If it is ground hum... It is either one of them... For this test... I suppose 最後修改時間: 2021-01-26 22:22:19 |
hahayanyan![]() 49.xxx.xxx.147 |
2021-01-26 22:20 |