Another ebay bargin but is it any good?

Boscoe · 12:49 PM

I found THIS on ebay and think it's very good value for money, I'm wanting to use it for home TV will it be any good? If not could someone give me some links to a good place other than 41hertz or good value complete units please!!!! Thanks.
Thanks

Original Burnedfingers · 21st February 2010, 01:06 PM

save your money

there is no way its going to put out the power it claims. It might be good for 40 or 50 watts if properly heat sinked. To be honest I would expect to see it self destruct.

frank1 · 21st February 2010, 03:59 PM

Quote:

Originally Posted by Boscoe

I found THIS on ebay and think it's very good value for money, I'm wanting to use it for home TV will it be any good? If not could someone give me some links to a good place other than 41hertz or good value complete units please!!!! Thanks.
Thanks

Checkout the guy's feedback rating, its 100% then decide for yourself.

linuxguru · 21st February 2010, 04:01 PM

4 x 2sc5200/2sa1943 as the output BJTs are sufficient for 250W into 8 ohms comfortably. It can go to 500W into 4 ohms only at 64V output amplitude - which is possible, but the load has to be very well-behaved, and mostly resistive for stabilty.

Boscoe · 21st February 2010, 04:26 PM

Are we talking RMS watts or the other watts?

linuxguru · 21st February 2010, 04:32 PM

RMS Watts into a pure resistive load. 64^2 / (8 * 2) = 256 W into 8 ohms at 64V amplitude (feasible with +/- 70V rails as specified for that board). It will also put ~500W into 4 ohms (resistive). The problem is that real speaker loads are rarely fully resistive - they will have a reactive component, usually capacitive.

jaycee · 22nd February 2010, 05:19 AM

It is not a Class D amp, it is class AB and those are MOSFET outputs. They are, as I understand, a derivative of the Exicon MOSFETs which are pretty tough cookies, so it may indeed do 500W into 4 ohms with 70v supplies as claimed.

AndrewT · 22nd February 2010, 04:14 PM

look up the classd website (in the UK).
I think you will find more details there.

21st February 2010, 12:43 PM	#1
Boscoe diyAudio Member Join Date: Feb 2010 Location: England	Another ebay bargin but is it any good? I found THIS on ebay and think it's very good value for money, I'm wanting to use it for home TV will it be any good? If not could someone give me some links to a good place other than 41hertz or good value complete units please!!!! Thanks. Thanks Last edited by Boscoe; 21st February 2010 at 12:49 PM.

22nd February 2010, 04:14 PM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	look up the classd website (in the UK). I think you will find more details there. __________________ regards Andrew T.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Possible Ebay bargin	Shoog	Tubes / Valves	0	22nd September 2009 07:05 PM
Good sellers on ebay anyone?	Atilla	Everything Else	11	20th February 2009 09:03 PM
Anyone fancy a bargin pair of Isophon RED magnets.	Shoog	Full Range	2	25th November 2005 06:59 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

21st February 2010, 01:06 PM	#2
Original Burnedfingers diyAudio Member Join Date: Nov 2002	save your money there is no way its going to put out the power it claims. It might be good for 40 or 50 watts if properly heat sinked. To be honest I would expect to see it self destruct.

21st February 2010, 04:01 PM	#4
linuxguru diyAudio Member Join Date: Sep 2007	4 x 2sc5200/2sa1943 as the output BJTs are sufficient for 250W into 8 ohms comfortably. It can go to 500W into 4 ohms only at 64V output amplitude - which is possible, but the load has to be very well-behaved, and mostly resistive for stabilty.

21st February 2010, 04:26 PM	#5
Boscoe diyAudio Member Join Date: Feb 2010 Location: England	Are we talking RMS watts or the other watts?

21st February 2010, 04:32 PM	#6
linuxguru diyAudio Member Join Date: Sep 2007	RMS Watts into a pure resistive load. 64^2 / (8 * 2) = 256 W into 8 ohms at 64V amplitude (feasible with +/- 70V rails as specified for that board). It will also put ~500W into 4 ohms (resistive). The problem is that real speaker loads are rarely fully resistive - they will have a reactive component, usually capacitive.

22nd February 2010, 05:19 AM	#7
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	It is not a Class D amp, it is class AB and those are MOSFET outputs. They are, as I understand, a derivative of the Exicon MOSFETs which are pretty tough cookies, so it may indeed do 500W into 4 ohms with 70v supplies as claimed.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)