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darrencw
PostPosted: Mon Feb 18, 2008 2:05 pm    Post subject: Reply with quote



Joined: 13 Aug 2007
Posts: 130

bro bro sekalian, recently i beli tube amp 5 watts nih dari bro azmok.
for the price paid i think its a VERY good buy. mana nak cari tube amp with 6L6,EL34 and 6V6 nih. soldering and all pun clean. but one thing i heran. quality pun ok,sound pun cun (cannot compare with real thing laa).masa letak distortion/OD pedal, the sound memang muddy abis. xleh nak main rock and all regardless of which tube i pakai. pedal punya problem ke amp's problem? i dah cuba ngan pedal lain tapi sama gak problem dia.

second problem, sapa2 yg dah try amp nih mesti tau kt blkang byk gak switch diode ke, apa2 ke. x ingat sangat nama dia. bila i google dan baca terms dia. blur abis. x paham langsung.bila i tukar tukar switch tu xde plak bezanya to my ears. anyone here can enlighten me?

ps:baru baca post kat atas tu about diode and all. blur gak...sry nk mintak tolong otai2 kat sini. Very Happy
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keysersoze
PostPosted: Mon Feb 18, 2008 3:14 pm    Post subject: Reply with quote



Joined: 21 Aug 2006
Posts: 142

browndog2woof wrote:
keysersoze wrote:
ultraman_cosmo wrote:
aku terbau bassman 135 aaa.. ehhhh... Laughing Laughing Laughing

hehe.. dah kene pancing.. price cunn.. dapat pun kene repair dlu, preamp high voltage tak masuk...tapi dah ok dah, 6l6 je tarak. pakai el34 kejap..berat tak hingat..


let's come and have a fire up party...., the bassman saga! tubes apa ko nak balun?

woof!


tube tak tau lagi ..aritu ade mail nik dier ade 6l6 EH -dlm 55 sebiji. pagi tadi call cam tak bangun lagi jer..
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browndog2woof
PostPosted: Mon Feb 18, 2008 3:21 pm    Post subject: Reply with quote

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11 ke atas je.... malam dia online..

woof!
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keysersoze
PostPosted: Mon Feb 18, 2008 3:27 pm    Post subject: Reply with quote



Joined: 21 Aug 2006
Posts: 142

ultraman_cosmo wrote:

Hahah,
dah biasa dengan circuit, aper sangat la nak repair tu. Transformer ok dah tentu tarak hall. fender nyer tranformer tahan lasak seyy, payah nak lunyai.
- kena buat half power supaya tak kuat sangat... hahhahah.
- semua ori lagi kaaa. huuuuu.
- pakai cap itam besar gedabak.
- kasih upgrade filter cap besar skit buang noise.
- phase inverter ikut spec lama, low gain black face, baru cun.
- semua cap ceramic kasih suka mica - itu high datang balik.
- bright cap bileh tukar mica bagi low noise.
- bias kasih moderate, 32 mA kaaa, 34 mA kaaa.



rase cam sayang nk mods2 nih..buat mase skang la.. sumer ori.. deal dgn bro browndog mesti vintage nyer --vintage dealer--cume filter caps yg vintagetu je dah tuka.. pasal dah kering. bassman nih tarak bias trimpot.. takble bias sesuka ati.. yg tu rase mmg kene tuka trimpot la nanti ..byk fender lame2 mmg tarak bias trimpot le..tgk schematic2. dier pakai resistor je..
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keysersoze
PostPosted: Mon Feb 18, 2008 3:31 pm    Post subject: Reply with quote



Joined: 21 Aug 2006
Posts: 142

darrencw wrote:
bro bro sekalian, recently i beli tube amp 5 watts nih dari bro azmok.
for the price paid i think its a VERY good buy. mana nak cari tube amp with 6L6,EL34 and 6V6 nih. soldering and all pun clean. but one thing i heran. quality pun ok,sound pun cun (cannot compare with real thing laa).masa letak distortion/OD pedal, the sound memang muddy abis. xleh nak main rock and all regardless of which tube i pakai. pedal punya problem ke amp's problem? i dah cuba ngan pedal lain tapi sama gak problem dia.

ps:baru baca post kat atas tu about diode and all. blur gak...sry nk mintak tolong otai2 kat sini. Very Happy


bleh amik gamba wiring kat dalam? kalau bleh post kat sini.. gamba panel dpn, blakang ngn dlm..

kalau tak bwk umah browndog wekend ni bleh same2 studi.. Wink
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jackwylde
PostPosted: Mon Feb 18, 2008 3:45 pm    Post subject: Reply with quote



Joined: 15 Oct 2007
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darrencw wrote:
bro bro sekalian, recently i beli tube amp 5 watts nih dari bro azmok.
for the price paid i think its a VERY good buy. mana nak cari tube amp with 6L6,EL34 and 6V6 nih. soldering and all pun clean. but one thing i heran. quality pun ok,sound pun cun (cannot compare with real thing laa).masa letak distortion/OD pedal, the sound memang muddy abis. xleh nak main rock and all regardless of which tube i pakai. pedal punya problem ke amp's problem? i dah cuba ngan pedal lain tapi sama gak problem dia.

second problem, sapa2 yg dah try amp nih mesti tau kt blkang byk gak switch diode ke, apa2 ke. x ingat sangat nama dia. bila i google dan baca terms dia. blur abis. x paham langsung.bila i tukar tukar switch tu xde plak bezanya to my ears. anyone here can enlighten me?

ps:baru baca post kat atas tu about diode and all. blur gak...sry nk mintak tolong otai2 kat sini. Very Happy



hmm..... i think setting punya prob kot.. aku punya ok je( for my ears la) Laughing aku set volume low biar clean habis. gain low,pakai output tube yang belah kanan skali. ok la bg aku. ( tried with ds-1,mt-2,sansamp gt-2)
bro mirz!! where r u???? Smile Smile Smile
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ultraman_cosmo
PostPosted: Mon Feb 18, 2008 3:55 pm    Post subject: Reply with quote

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keysersoze wrote:
ultraman_cosmo wrote:

Hahah,
dah biasa dengan circuit, aper sangat la nak repair tu. Transformer ok dah tentu tarak hall. fender nyer tranformer tahan lasak seyy, payah nak lunyai.
- kena buat half power supaya tak kuat sangat... hahhahah.
- semua ori lagi kaaa. huuuuu.
- pakai cap itam besar gedabak.
- kasih upgrade filter cap besar skit buang noise.
- phase inverter ikut spec lama, low gain black face, baru cun.
- semua cap ceramic kasih suka mica - itu high datang balik.
- bright cap bileh tukar mica bagi low noise.
- bias kasih moderate, 32 mA kaaa, 34 mA kaaa.



rase cam sayang nk mods2 nih..buat mase skang la.. sumer ori.. deal dgn bro browndog mesti vintage nyer --vintage dealer--cume filter caps yg vintagetu je dah tuka.. pasal dah kering. bassman nih tarak bias trimpot.. takble bias sesuka ati.. yg tu rase mmg kene tuka trimpot la nanti ..byk fender lame2 mmg tarak bias trimpot le..tgk schematic2. dier pakai resistor je..


- bias trimpot boleh add.
- fender biasanya pakai fixed bias.
- ada trimput pun sebenarnya utk kasih tube match. kira kita kassih tube running the same watt, tapi still kita boleh buat satu trimpot before ground so boleh bias the whole tube.
- Amp aku, aku set boleh bias antara tube bagi match, or bias keseluruhan tube. Mean kalo 6l6 tube brand tak sama pun tarak hal pasal still aku boleh kasih match bias dia.

- Cam mana ko tukar el34 kalo tak boleh bias. Sebab 6l6 n el34 bias tak sama. pacak jer ker.
- dekat output tube matching tu, ada satu resistor 33k solder to ground. 33k ne la kira boleh ganti dengan trimpot so ko boleh change the bias. resistor tu belakang jer trimpot, match tu balance tu kalo tak silap.

- kalo cap ori tu jangan tukar, kalo ceramic pun nak tukar mica, part dia simpan la. nanti nak undo balik senang.
- memang pun kena feel dulu 2 3 bulan kasih origanal spec. hahahha.
- sebenarnya, kalo ikut spec bassman lama, bukan kena add, tapi ada beberapa benda kena desolder tak guna.
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darrencw
PostPosted: Mon Feb 18, 2008 4:04 pm    Post subject: Reply with quote



Joined: 13 Aug 2007
Posts: 130

keysersoze wrote:
darrencw wrote:
bro bro sekalian, recently i beli tube amp 5 watts nih dari bro azmok.
for the price paid i think its a VERY good buy. mana nak cari tube amp with 6L6,EL34 and 6V6 nih. soldering and all pun clean. but one thing i heran. quality pun ok,sound pun cun (cannot compare with real thing laa).masa letak distortion/OD pedal, the sound memang muddy abis. xleh nak main rock and all regardless of which tube i pakai. pedal punya problem ke amp's problem? i dah cuba ngan pedal lain tapi sama gak problem dia.

ps:baru baca post kat atas tu about diode and all. blur gak...sry nk mintak tolong otai2 kat sini. Very Happy


bleh amik gamba wiring kat dalam? kalau bleh post kat sini.. gamba panel dpn, blakang ngn dlm..

kalau tak bwk umah browndog wekend ni bleh same2 studi.. Wink


hmm,actually masa tu i dah cakap nak post pics semua tu. tp x jadi sbb bz. mungkin mlm nih i boleh ambik gambar and post? hehe...rumah browndog kat mane!
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browndog2woof
PostPosted: Mon Feb 18, 2008 4:31 pm    Post subject: Reply with quote

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yo fellas,

hah! mari try aku punya selmer... ha ha ha! aku nak jual tu.... nak kompol duit beli ferrari.. tahun 1963 babe!

woof!
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keysersoze
PostPosted: Mon Feb 18, 2008 5:05 pm    Post subject: Reply with quote



Joined: 21 Aug 2006
Posts: 142

ultraman_cosmo wrote:
[quote="keysersoze

- bias trimpot boleh add.
- fender biasanya pakai fixed bias.
- ada trimput pun sebenarnya utk kasih tube match. kira kita kassih tube running the same watt, tapi still kita boleh buat satu trimpot before ground so boleh bias the whole tube.
- Amp aku, aku set boleh bias antara tube bagi match, or bias keseluruhan tube. Mean kalo 6l6 tube brand tak sama pun tarak hal pasal still aku boleh kasih match bias dia.

- Cam mana ko tukar el34 kalo tak boleh bias. Sebab 6l6 n el34 bias tak sama. pacak jer ker.
- dekat output tube matching tu, ada satu resistor 33k solder to ground. 33k ne la kira boleh ganti dengan trimpot so ko boleh change the bias. resistor tu belakang jer trimpot, match tu balance tu kalo tak silap.

-


el34~6L6 bleh masuk due2 ,tapi cam bassman ni mmg ngam dgn 6L6 ,pasal output tranny (primary) nyer impendence dah buat match dgn power tubes nyer plate to plate impendence. tapi bende nih pon tak
terlalu constant dan .. dier berkadaran/berubah ngn plate voltage.
kene refer tube datasheet ler.. hehe. tiba masa nak fine tune..

http://www.pmillett.com/tubedata/HB-3/Receiving_Tubes_Part_2/6L6-GC.PDF

http://tdsl.duncanamps.com/show.php?des=6L6GC

masuk el34 bleh jln tapi cam kete pakai tayar kecik yg spare tu ar.. tak bape sedap.

yg fix bias tu dier supply negative voltage ke screen grid utk set bias. kalau bro amik reading pin 5 power tubes respect to the ground mesti dapat negative reading nyer..
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browndog2woof
PostPosted: Mon Feb 18, 2008 5:44 pm    Post subject: Reply with quote

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yo guys,

kalo nak pi beli parts sms aku ya... aku nak kirim... tengah tunggu cosmoTS5rocket dgn germanium diode ni.. btw, test sumbat kt66 pon bole kot.... jangan takut, abis kuat meletop je.. ha ha ha!

woof!
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ultraman_cosmo
PostPosted: Mon Feb 18, 2008 5:57 pm    Post subject: Reply with quote

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browndog2woof wrote:
yo guys,

kalo nak pi beli parts sms aku ya... aku nak kirim... tengah tunggu cosmoTS5rocket dgn germanium diode ni.. btw, test sumbat kt66 pon bole kot.... jangan takut, abis kuat meletop je.. ha ha ha!

woof!


Meletup tak pe, pasal aku pakai baju otoman. siap helmet dan ray ban otaman.

keysersoze,
- nanti senang aku send article utk convert to el34 dan bias nyer mod. atau datang umah jer. boleh tengok trus.
- Sorry laaa, aku asik menghilangkan diri ujung minggu jer.. hahhaha. Asik tak dapat jumpa...
- maklumlah, masa pilihan raya ne aku bz skit gantung poster.


Saper ada el34 lebih, jual kat gua. aku lom pernah meletupkan tube el34 ne. 6L6 dah pernah dilakukan... hahhahah.
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jackwylde
PostPosted: Thu Feb 21, 2008 7:43 pm    Post subject: Reply with quote



Joined: 15 Oct 2007
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Location: KMN TRG

atas permintaan kyserose,

nah gambo amp tube sound 5 watt. aku bukak sket. Cool









aku tgk ade satu tube kaler itam mcm terbakar ke ape ntah. tube ni rosak ke? ke memang mcm tu.? Confused Confused Confused

satu lagi salah satu output tube mode ada yang pakai 2 tube skali. yg lain satu. tube ape eh? kalo bleh cam dr gambo yg x brape clear ni bleh tak bgtau nama2 tube2 nih? yang besar tu ape? im super NOOB Embarassed Embarassed
yg second paling besar ( seblah yg itam tu rectifier tube kan?)
yg kecik skali ke dalam tu preamp tube kan? kan?

malas nak pasang balik. nanti dah pasang aku upload gamba combo skali. korng bleh tgk apa function yg ada nnt.
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keysersoze
PostPosted: Fri Feb 22, 2008 9:34 am    Post subject: Reply with quote



Joined: 21 Aug 2006
Posts: 142

wow thanks jack, nice pic.. tak paham lagi camne dier nyer function.. takpe nanti kene cari member yg dh pakai utk test/bukak. torodial tranny cantek..mahal tu..

-tube itam? dah kong ar tu..
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ultraman_cosmo
PostPosted: Thu Jun 05, 2008 1:00 pm    Post subject: Reply with quote

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Replacement Powertube.

Secara kasar kalo kita main tube amp ne, kita kena tau juga bila nak tukar tube. macam kita main guitar, sometime kita rasa dah tiba masa kita kena tukar string sebab string lama dah mula sembap bunyi dia.

Powertube
- Sebenarnya kita sepatutnya selalu tukar powertube berbanding tube amp.
- walo macam mana pun ada satu preamp tube yg kita patut tukar juga bila kita replace powertube.
- preamp tube ne adalah preamp tube pada stage phase inverter. So ada baiknya kita mark socket preamp tube phase inverter ne supaya boleh tukar sekali masa replace itu powertube.
- utk pair or quad tube, biasanya kita tukar satu set. Utk, Kalo satu rosak dan satu lagi ok, still di syorkan tukar kedua dua sekali. beli la matched pair. Yg ok tu buat la backup atau kegunaan utk testing amp.
- Tube ne diorang kata macam tayor keta, makin selalu pakai makain cepat haus, lagi banyak driff pun makin cepat dia mintak duit.
- So makin selalu kita on tube amp, maka makin cepat dia lunyai. Lagi banyak watt kita drive ini powertube, hot bias, maka makin cepat dia mintak duit.
- kebiasaan usia powertube pada moderate use adalah 2 tahun.
- biasanya guitarist tukar powertube once a year. kalo jarang main maybe 2 tahun.
- ia berbeza kengkadang from tube to tube juga.
- kebiasaanya bila tukar powertube ini amp kena re-biased.
- ceta pasal rebias ne, kalo kita pakai powertube sama dan brand sama utk replacment biasanya no need tu rebias. Pekara rebias ne adalah disebabkan walo pun pada family powertube sama tapi tube amp ne berbeza ada watt berbeza dan current loaded berbeza dan sebagainya. 6L6 vintage dan 6L6GC mempunyai watt yg berbeza walopun ini family sama.
- kadang kadang tube yg sama pun kena biasa balik sebab tiap tiap tube rating power dia tak sama walopun brand yg sama, sebab tu kuar la bebenda matched pair dan quad



Soalan dia bila kita nak tukar powertube?

1. Terbakar.
- biasa berlaku bila resistor failer.

2. Kabus putih
- ini maksudnya itu gas udara sudah bolos masuk dalam tube.

3. freq respone bass dan treble.
- biasanya la powetube yg dah lunyai dia punya bass dan treble bunyi dah tak cun.
- Aku biasanya tak dengar sangat perbezaan treble, maybe spakle jer kurang.
- tapi biasanya aku dengar bass yg pelik, a bit distort atau pecah.

4. Power dah kureng.
- mean kalo biasa separuh volume jiran keempat selang rumah akan gincang pagar, kali ne hanya jiran selang sebelah rumah jer yg keluar.
- kurang la kuat bunyi dia.

5. fuse amp putus.
- biasanya kalo fuse asik kena tendang, kemungkinan besar biasanya powertube.
- Kalo u nyer amp ada 2 powertube, replace itu fuse, try cabut satu powertube, kalo fuse blow lagi maksudnya tube tu rosak, kalo fuse tu steady, mean powertube tu ok. tapi still kena tukar kedua tube in pair.
- tube rectifier juga boleh nyebab ini fuse tendang.
- On kedua dua switch serentak tanpa ada stanby mode sekejap, pun ini fuse boleh tangallll.
- simpan extra fuse,

7. hilang gain
- boleh dengar gain dah kurang, sustain dah macam cut off.

8. tone awal yg hampessss
- ok kata la kita stancby 1 minit. then on amp. Kita dengar tone kuar dari amp tu a bit noisy, dark dan lain dari biasa. Then after 10 ker 20 minit baru nak sound cun. OK. biasanya semakin nak bancai powertube, maka semakin lambat utk dia menyesuaikan diri dengan voltage. So dia makain lambat nak kerja dengan sebaiknya.

9. filiment voltage n ampier.
- kalo dalam design amp ne biasanya kita caculate voltage dan current ampier yg sesuai utk utk run the filiment heater.
- aku angap semua amp dah caculate dengan betul dan tak perlu dipertikaikan.
- Tapi katakan la satu amp tu ada 7 preamp tube and 2 powertube. 2 channel amp macam fender.
- then kita buang satu chanel dan kita pakai only 4 preamp tube.
- tranformer tu didisign utk power up 7 preamp tapi kita pakai 4 jer maka current yg dikenakan utk setiap

heater lebih utk 4 tube berbanding 7 tube.
- Kebiasaanya ia kan menyebabkan usia tube tu semakin kurang.

10. noise, Krack sound, bunyi air mendidih, feedback microphonic, humming
- feedback microphonic biasanya lebih kepada preamp tube.
- noise dan Krack and bunyi air mendidih maybe disebabkan powertube bancaii.
- walo cam mana pun bebenda macam power suply section, capasitor, bad preamp pun boleh jadi benda sama.
- kalo amp ada master volume, try cabut last tube before tube phase inverter.
- kalo kita pusing master volume dan akan ada noise macam ne maka mean ia berasal dari phase inverter ker powertube dan power suply.
- kalo ia hilang, mean ia berasala dari preamp section.
- try cabut phase inverter tube adalah keadah biasa utk dignose di mana masalah sebenar circuit amp.
- humming biasanya lebih kepada filter cap nyer problem.

10. power tube color
- kebanyakan doktor amp tak kisah sangat dengan masalah purple or blue glow pada tube amp.
- biasanya ia terjadi disebabkan ada gas terperangkap dalam tube tersebut. berlangar dengan electron maka

warna dihasilkan. Macam neon nyer lampu nyer effect.
- biasanya ia manufacture error dimana gass tak abis disedut dalam tube tersebut.
- Tapi secara tecknikalnya, jika ia berlaku, gas tersebut akan menyebabkan suhu dalam tube lebih panas.
- Ada orang kata, diorang suka sebab itu tube bunyi lebih sweet.
- but, kebiasaanya tube cam ne lebih cepat lunyai disebabkan suhu dalam tube lebih dari sepatutnya.

11. hot bias.
- biasanya lagi hot kita bias satu amp maka makin cepat itu tube
- utk elakkan amp kena selalu di rebias, bias utk amp yg pakai 2 tube katakan, kita biasa beli matched pair.
- kalo ada rezeki kita beli matchec quad, so akita ada 1 pair utk amp dan 1 pair utk backup. soa dal kes cam ne, bila swap tube baru tak payah la buat rebias.
- Tecknikal sangat, rebias tu carik la memereka yg bertauliah.

12. backup tube.
- biasanya kita simpan set backup tube, preamp dan powertube.
- lebel la mana satu baru dan mana satu lama atau rosak.
- kita boleh guna extra part ne utk check dari mana problem tu berlaku.
- contohnya amp kita tetiba noise dan crackly sound.
- try replace powertube spare, kalo noise tu hilang mean powertube lama tu lah masalahnya.
- kalo masih noise maknanya tak perlu tukar powertube lagi, dan maybe masalah datang dari section lain macam preamp, power suply dan sebagainya.
- so kita boleh pasti bila sebenarnya kita kena tukar powertube sepatunya.
- Keadah tukar dan dengar.



Tip supaya powertube tahan lama.

1. Always stanby mode atlease 20 minit. Sebab stanby mode high voltage tak akan melalui tube. tube akan sensara jika kita lalukan high voltage pada filiment yg belum cukup panas. Emagine baru bangun tido trus sprint 100 meter... boleh jam jantung karang... hahhahah.

2. recap selalu supaya bias setting dan powersuply stabil dan tak merosakan powertube.

3. Kurangkan Krack the amp. kalo just main biasa tak payag la blasst kuat kuat kecualilah memang serous nak dapat tone. Stakat nak on amp sebab nak practise jari tu, ayooo, pelahan jer dah laaa. hahahha.

4. jangan main amp lama sangat la, atau dibior on walopun tak main guitar. Tapi kalo selalu tak on amp, masalah lain macam cap kering akan terjadi. so on jer lah 5 minit ker then tutup. Try la tak on itu amp 2 3 minggu. then memacam sound akan kuar, maybe tikus dan lipas akan kuar sekali... hahahah.

5. Cam biasa kasih warm up dan kasih cool down. biar tube sejuk baru lah nak angkat dan usung ke hulu ke hilir.

6. sentiasa pastikan socket powertube dalam keadaan baik. sebab kalo tak sentuh pin dengan slot boleh menyebabkan powertube tendang pastu menyala dan trus tidooo. pehatikan semua tube berada kemas pada tube socket sebelom on power.



Utk memancing supaya lebih ramai yg pakai tube amp maka gua bagi ini article. Walocam mana pun kalo ada yg salah harap perbetulkan sebab aku pun ketam juga, ajar anak jalan lurus... kakkakaka. Ini compilasi dari self exprience, master master tube amp, doktor amp gua (kesyor), internet n book.

Sesapa nak tambah dipersilakan....

Next maybe about preamp tube dan bila kena recap semua elec cap.

Thank.
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