500 WPC on 24v for $69

bobgroger · 23rd December 2006, 12:39 AM

with 2pr counterfeit transistors. Yeah, right....

http://cgi.ebay.com/ws/eBayISAPI.dll...2472&rd=1&rd=1

Nordic · 23rd December 2006, 08:20 AM

What exactly does one do with 500W, considering you can solder with 15W, or do thse people live in the city hall.

djk · 23rd December 2006, 10:33 AM

If you could get it to run on ±47V without blowing up, it might put out 60W/8R per channel. The heatsink looks like a very poor design. No sign of thermal tracking for the bias.

I used to look at junk like this from MK V Audio and wonder why they went to all the trouble to kit up something that had a poor design (at best).

Some of the kits from Dick Smith (AU) weren't much better.

Original Burnedfingers · 23rd December 2006, 10:55 AM

Someone is actually going to buy it thinking they are going to have a 500 watt amp. Throw the name gainclown on it and I guess anything will sell.

megajocke · 23rd December 2006, 04:01 PM

Look! The caps are rated 50V

and the PCB says "AC 20-26V"

Probably 500 very small watts? Maybe miniwatts...

Nordic · 23rd December 2006, 04:38 PM

I saw an amp marked 1000W PMPO
and in smaller print below 50 + 50W RMS

The 1000W PMPO was in a font about 4 times the size of the second.

AndrewT · 23rd December 2006, 04:41 PM

Hi,
the 1943/5200 running on low supply rails perform very well.
4pair are capable of 350W into 2r with a load phase angle of 40degrees and yet stay with the DC SOAR 35degC.
Increasing the load phase angle to 60degrees just takes the 4pair to the 100mS SOAR.

Pulsed operation into 1.2r would just about hit 500W.

All this from +-48Vdc.
From +-38Vdc (26Vac) well that takes some believing.
But if you were talking peak power into 1r2, that needs just 24.5Vpk and even less into 1r0.

lineup · 23rd December 2006, 04:57 PM

Quote:

Originally posted by bobgroger
with 2pr counterfeit transistors. Yeah, right....
http://cgi.ebay.com/ws/eBayISAPI.dll...2472&rd=1&rd=1

I did a closeup = VERY CLOSE! of one of those 2SC5200
in that 500W + 500W amplifier.
From my attached 2SC5200 image
some one may be able to see if is a Faked or A good transistor.

Regards
lineup

TomWaits · 23rd December 2006, 05:11 PM

Quote:

Originally posted by lineup
I did a closeup = VERY CLOSE! of one of those 2SC5200
in that 500W + 500W amplifier.

I hope you don't do that to my photo's, you'll see all my mistakes!

Detective Lineup.

Shawn.

lineup · 23rd December 2006, 05:44 PM

Quote:

Originally posted by TomWaits

I hope you don't do that to my photo's, you'll see all my mistakes! Detective Lineup.

Shawn.

Hmmmm, TomWaits .... have photos

well, no paticular reason but ... tell me where you have some of those photos

23rd December 2006, 12:39 AM	#1
bobgroger diyAudio Member Join Date: Dec 2005 Location: Seattle, WA, USA	500 WPC on 24v for $69 with 2pr counterfeit transistors. Yeah, right.... http://cgi.ebay.com/ws/eBayISAPI.dll...2472&rd=1&rd=1

23rd December 2006, 04:41 PM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, the 1943/5200 running on low supply rails perform very well. 4pair are capable of 350W into 2r with a load phase angle of 40degrees and yet stay with the DC SOAR 35degC. Increasing the load phase angle to 60degrees just takes the 4pair to the 100mS SOAR. Pulsed operation into 1.2r would just about hit 500W. All this from +-48Vdc. From +-38Vdc (26Vac) well that takes some believing. But if you were talking peak power into 1r2, that needs just 24.5Vpk and even less into 1r0. __________________ regards Andrew T.

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

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

23rd December 2006, 08:20 AM	#2
Nordic diyAudio Member Join Date: Sep 2005	What exactly does one do with 500W, considering you can solder with 15W, or do thse people live in the city hall.

23rd December 2006, 10:33 AM	#3
djk diyAudio Member Join Date: Feb 2001 Location: USA	If you could get it to run on ±47V without blowing up, it might put out 60W/8R per channel. The heatsink looks like a very poor design. No sign of thermal tracking for the bias. I used to look at junk like this from MK V Audio and wonder why they went to all the trouble to kit up something that had a poor design (at best). Some of the kits from Dick Smith (AU) weren't much better.

23rd December 2006, 10:55 AM	#4
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Someone is actually going to buy it thinking they are going to have a 500 watt amp. Throw the name gainclown on it and I guess anything will sell.

23rd December 2006, 04:01 PM	#5
megajocke diyAudio Member Join Date: Jan 2003 Location: Solna	Look! The caps are rated 50V and the PCB says "AC 20-26V" Probably 500 very small watts? Maybe miniwatts...

23rd December 2006, 04:38 PM	#6
Nordic diyAudio Member Join Date: Sep 2005	I saw an amp marked 1000W PMPO and in smaller print below 50 + 50W RMS The 1000W PMPO was in a font about 4 times the size of the second.

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