power amplifier
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power amplifier
This advertisement is already inactive- Price:
P20,000.00 - Date Posted: February 19, 2009
- Classification: For Sale
- Condition: 2nd Hand (Used)
- Location: Valenzuela City, Metro Manila
- Warranty: Personal Warranty
-
- Ad ID: 1171813
- Date Updated: July 20, 2011
- Category: Amplifiers
- Short URL:
- Contact Numbers:
- +63-919-XXX-XXXX+63-919-601190676-7791
- Feedback Score:
- 2
- 100% Positive Feedback
Close X Feedback Computation
Legend: (Feedback Count) Computed Score Feedback DetailsFeedback
Type> 12 mos.
x1 pt.12 mos.
x2 pts.6 mos.
x3 pts.3 mos.
x4 pts.Total Positive (2) 2 - - - 2 Negative - - - - - Total: 2 - Member Address: Meycauayan City, Bulacan
- Last Access From:Philippines
-
- Registered: Jan 8, 2009
- Last Sign In: 2 days ago
- View other ads of jimboyfortin.
Description
Seller Contact Details
jimboyfortin
jimmy fortin- +63-919-XXX-XXXX+63-919-601190676-7791
- 2
- 100% Positive Feedback
| Feedback Type | > 12 mos. x1 pt. | 12 mos. x2 pts. | 6 mos. x3 pts. | 3 mos. x4 pts. | Total |
|---|---|---|---|---|---|
| Positive | (2) 2 | - | - | - | 2 |
| Negative | - | - | - | - | - |
| Total: | 2 | ||||
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Comments
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| posted on April 30, 2009 03:00PM | |
|---|---|
arturo
| :) message updated December 15, 2009 10:04AM |
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| posted on June 25, 2009 07:13AM | |
alyaspogi710
| crisantovilla posted on April 30, 2009 02:44PM i juz wnt 2 coment on arturos coment; we r talking here was the amplifier of pagarigan(thunder) n not the asembled by westrak lets say westrak wer gud n asembling his amplfier,its obious sins he has no poblim about it,other people have problims on thunder amp,im not saying that thunder amp wer not gud,i agre it s gud for those who wnt to start.with gud experienz n gud selection of electroniks parts thunder will give u 360wats(actualy 364wats), with 0-50v,20A suply. it hardly even reach 50-55v across load during operations(try to measure it at 4ohms load). now regarding on the featured amp here i may say that it s gud amp for outdor aswel as indor. it will drive 4ohms load upto 65v(66.9v actualy n wil giv u a 560wats at 4ohms)(try to chek it during operation)but dnt tek it too long it wil fry the voice coil f ur speker has low power.f we hav a gud parts,asembling skils n enough power on xfomer side.xformer secondary winding shal b of 12A ampacity.thus ur xformer shal be of 24A market rating.and f anyone knows how 2 find the soln' regarding ds computation. u may post ur coments. to conclude AMP POWER:1000-1120Watts@4ohms, Load: 4 subzero,2spekr parallel/chanel.awesome for outdor aplication.i'll giv 5star rating ROFLMAS! halos magdugo ilong ko sa english nito a! puro text speak pa, sana tinagalog nalang lol! BTW! available pa ba 20 Karat gold amp nato hehehe! kaaliw! |
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| posted on January 8, 2010 10:20AM | |
ct22eton21
| @westrak if you can read this comment, I am very interested on your thunder mods. I have working thunder for around 5 years already, the offset voltage is fluctuating, I can set it around 100mV then later it fluctuates up to 1V, im using MJ15024 output transistor and it becomes very hot at half of the volume yet stable with minimal heat around 1/4 of the potentiometer volume... I know this amp is considered as antique but I want to use it as price of my hardwork and I hope you can help me also in moding it:) please pm me for details if you can read this, thanks |
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| posted on March 9, 2010 02:55PM | |
mark2robert
| from aux (malabon), |
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| posted on July 19, 2010 02:45AM | |
| thunderwest | Mga tol, Thunder 1 & 2 ay madali lang ang problema Quasi complementary & full complemantary symetry!Gaya ng sabi ni westrak before lahat nakalagay na voltage measurement ay lalabas ng normal at stable ang bias basta marunong kayo umintindi ng ciruits ito po ang clue yung nagkakaroon k ng dc out mali connection ng transistor mo sa input C945 then sa isa nman powering on pa lng putok na mga power out kc mali ang circuits mo sa driver pa lng mali na ang supply kulang ng resistor sa driver ng amps at isa pang resistor sa gitna hehehe.Ayan wala ng mahirap cnabi ko n po pag aralan nyo n lng yung circuits ginagawa ko yn noon pambahay Westrak amps na gmit nmin ni pareng westrak tropa ko un .@ mark2robert Alanganin pa explanation mo walang kinalaman ang pagkakaroon ng Dc voltage sa pagbaba ng voltahe unless kung may problema ka sa diffrential stage ng amps mo depende yun kung paano mo ginawa amps mo & tama ka rin need talaga dalawa tester kailangan mo sukatan speaker out habang kinukuha mo ang bias base emiiter .c22eton21 pardz ano ym mo bka makatulong ako!Shukran!!! message updated July 20, 2010 03:42AM |
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| posted on February 2, 2011 10:04PM | |
subsonic1
| 2kiloohms n bias resistor gamitin para s bias .... dun s 47k n bias ginagawanaming 5k lng but may computed n naka series n resistor s kanya ... bale trial and error close enough to have zero output voltage ...para smooth pihitin ....gawa k ng pcb para s heatsink then dun nyo isolder lahat ng 5watts resistor para down n lng s 8pcs ang wire papuntang amp board less connection less hum and less trouble but fast troublshooting... kami kc even yung driver transistor ay nasa pcb n nakasolda s heatsink po .... malinis tingnan ...... |
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