Current-Dumper

gareth · 28th March 2008, 10:36 PM

Hi everyone,

Does anyone have any knowledge or experience of building a Current-Dumping amplifier. I think Quad used this type of topology in the 909 and I would like to have a go at one of these amps.

If anyone knows of or can share some design info then I would appreciate any help.

Thanks
Gareth

andy_c · 28th March 2008, 11:18 PM

Quote:

Originally posted by gareth
Does anyone have any knowledge or experience of building a Current-Dumping amplifier. I think Quad used this type of topology in the 909 and I would like to have a go at one of these amps.

If anyone knows of or can share some design info then I would appreciate any help.

Hi Gareth,

I have not built one, but this site has lots of information about it, including Peter Walker's original article in Wireless World.

jonusgrumby · 29th March 2008, 03:10 AM

The 405 circuit works well too. You can get a circuit board for it on eBay that will help with construction. I have built several variations on the 405 without that circuit board and have been very pleased with the results. Not having to worry about setting the output bias current or having to try to track it is a big plus too.

I really feel the poor limiting circuit on the original gave it a bad name and that current dumping is vastly underrated.

Good luck!

latala · 31st March 2008, 08:08 PM

I have obtained from China (Ebay) a set of the 405 boards and built myself a mini 405 . By recalculating a few values and using 2n3055 outputs and TIp 32a drivers switching the lm 311 for TL071 built a nice sounding amp of abouts 30 watts rms per channel more than enough for my Lowther spks
I can reccomend the boards highly they are not perfect but pretty close
delivery was within 2 weeks all in all a great buy
regards Trev

gareth · 1st April 2008, 06:01 PM

Quote:

Originally posted by latala
I have obtained from China (Ebay) a set of the 405 boards and built myself a mini 405 . By recalculating a few values and using 2n3055 outputs and TIp 32a drivers switching the lm 311 for TL071 built a nice sounding amp of abouts 30 watts rms per channel more than enough for my Lowther spks
I can reccomend the boards highly they are not perfect but pretty close
delivery was within 2 weeks all in all a great buy
regards Trev

Hi,
How much did the boards cost?

Thanks
Gareth

latala · 1st April 2008, 06:04 PM

£10 a pair + postage
I seem to remember the seller was (tubehunter)
regards Trev

gareth · 2nd April 2008, 06:19 PM

Quote:

Originally posted by latala
£10 a pair + postage
I seem to remember the seller was (tubehunter)
regards Trev

Hi,
Cheers Trev, thats a good price. Have you built the amps yet ? What do you think of them ?

Thanks
Gareth

latala · 2nd April 2008, 07:43 PM

The modules are built and have been listened to I am yet to put them in an enclosure !
What do I think? its a nice clean amp not world shattering but good!!!
I must add I used to be a quad dealer in the 70,s/80/s and always admired quad for the build quality but not much else
I only built them because I could .
I prefere the sound of my hitachie mosfet hma7500/phase linear 400b Sugden A41 amps but I have so many and I love them all
regards Trev

28th March 2008, 10:36 PM	#1
gareth diyAudio Member Join Date: Jan 2008	Current-Dumper Hi everyone, Does anyone have any knowledge or experience of building a Current-Dumping amplifier. I think Quad used this type of topology in the 909 and I would like to have a go at one of these amps. If anyone knows of or can share some design info then I would appreciate any help. Thanks Gareth

29th March 2008, 03:10 AM	#3
jonusgrumby diyAudio Member Join Date: Apr 2006 Location: USA	The 405 circuit works well too. You can get a circuit board for it on eBay that will help with construction. I have built several variations on the 405 without that circuit board and have been very pleased with the results. Not having to worry about setting the output bias current or having to try to track it is a big plus too. I really feel the poor limiting circuit on the original gave it a bad name and that current dumping is vastly underrated. Good luck! __________________ Tom

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31st March 2008, 08:08 PM	#4
latala diyAudio Member Join Date: Feb 2006 Location: staffordshire	I have obtained from China (Ebay) a set of the 405 boards and built myself a mini 405 . By recalculating a few values and using 2n3055 outputs and TIp 32a drivers switching the lm 311 for TL071 built a nice sounding amp of abouts 30 watts rms per channel more than enough for my Lowther spks I can reccomend the boards highly they are not perfect but pretty close delivery was within 2 weeks all in all a great buy regards Trev

1st April 2008, 06:04 PM	#6
latala diyAudio Member Join Date: Feb 2006 Location: staffordshire	£10 a pair + postage I seem to remember the seller was (tubehunter) regards Trev

2nd April 2008, 07:43 PM	#8
latala diyAudio Member Join Date: Feb 2006 Location: staffordshire	The modules are built and have been listened to I am yet to put them in an enclosure ! What do I think? its a nice clean amp not world shattering but good!!! I must add I used to be a quad dealer in the 70,s/80/s and always admired quad for the build quality but not much else I only built them because I could . I prefere the sound of my hitachie mosfet hma7500/phase linear 400b Sugden A41 amps but I have so many and I love them all regards Trev

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