Can someone help me out with what this amp might be

joesch1999 · 3rd May 2011, 04:47 PM

Power amp, amplifier, need work - eBay (item 300553221551 end time May-06-11 16:56:31 PDT)

is it worth buying, sounds like a resistor is bad, I have no idea who's work it is but I can tell it's home made.

sofaspud · 3rd May 2011, 06:26 PM

Well, one side is working so you could use it for comparison in troubleshooting the other side. I could only make out what looks like a 2N4037 TO3 at the output. And maybe the "400watts" deserves 2 question marks. The seller does have a good rating. Might not be too hard to squeeze 50 bucks worth of parts out of it if it wasn't repaired. Worth buying though I really can't say.

joesch1999 · 3rd May 2011, 06:28 PM

yeah lol I knew it was not 400 watts that is funny

jaycee · 3rd May 2011, 06:56 PM

Looks like it's a kit job. Worth it for the case and transformer alone if you feel like building something modern in there

joesch1999 · 3rd May 2011, 07:36 PM

I want to build burning amp 2 would it work for that? Looks like it might be to small

jaycee · 3rd May 2011, 10:17 PM

The heatsinks look a bit small for any Class A amp.

joesch1999 · 3rd May 2011, 10:29 PM

yeah thats what I thought, would the burning amp be good for all kinds of music I listen to everything from classical to pop to heavy metal

sreten · 3rd May 2011, 11:07 PM

Hi,

Its worth it for the parts (so far). FWIW the 400w power rating is ridiculous.
Class A amplifiers tend to have a small transformer size / heatsink size ratio.
This should be fairly obvious given the nature of the beast.

rgds, sreten.

jaycee · 3rd May 2011, 11:15 PM

Personally, with modern output devices and a sensible bias, I dont think Class A makes a difference at the power level - but that's just me.

joesch1999 · 10th May 2011, 04:26 AM

ok got my BA_1 boards today, I have the irf 240's ordered and the 9240's what size transformer for two channels and what size caps would 600v transformer work? Need some help this will be my first amp I have ever built from start to finish

3rd May 2011, 04:47 PM	#1
joesch1999 diyAudio Member Join Date: Jan 2011	Can someone help me out with what this amp might be Power amp, amplifier, need work - eBay (item 300553221551 end time May-06-11 16:56:31 PDT) is it worth buying, sounds like a resistor is bad, I have no idea who's work it is but I can tell it's home made.

3rd May 2011, 06:26 PM	#2
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio TX	Well, one side is working so you could use it for comparison in troubleshooting the other side. I could only make out what looks like a 2N4037 TO3 at the output. And maybe the "400watts" deserves 2 question marks. The seller does have a good rating. Might not be too hard to squeeze 50 bucks worth of parts out of it if it wasn't repaired. Worth buying though I really can't say. __________________ It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

3rd May 2011, 11:07 PM	#8
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Its worth it for the parts (so far). FWIW the 400w power rating is ridiculous. Class A amplifiers tend to have a small transformer size / heatsink size ratio. This should be fairly obvious given the nature of the beast. rgds, sreten. __________________ There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow

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3rd May 2011, 06:28 PM	#3
joesch1999 diyAudio Member Join Date: Jan 2011	yeah lol I knew it was not 400 watts that is funny

3rd May 2011, 06:56 PM	#4
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Looks like it's a kit job. Worth it for the case and transformer alone if you feel like building something modern in there

3rd May 2011, 07:36 PM	#5
joesch1999 diyAudio Member Join Date: Jan 2011	I want to build burning amp 2 would it work for that? Looks like it might be to small

3rd May 2011, 10:17 PM	#6
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	The heatsinks look a bit small for any Class A amp.

3rd May 2011, 10:29 PM	#7
joesch1999 diyAudio Member Join Date: Jan 2011	yeah thats what I thought, would the burning amp be good for all kinds of music I listen to everything from classical to pop to heavy metal

3rd May 2011, 11:15 PM	#9
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Personally, with modern output devices and a sensible bias, I dont think Class A makes a difference at the power level - but that's just me.

10th May 2011, 04:26 AM	#10
joesch1999 diyAudio Member Join Date: Jan 2011	ok got my BA_1 boards today, I have the irf 240's ordered and the 9240's what size transformer for two channels and what size caps would 600v transformer work? Need some help this will be my first amp I have ever built from start to finish

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