C Audio Pulse 2x1100

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   oh righty ... I thought you were talking about a power toriod ...  yeah, you should be able to wind small gate drive transformer by hand pretty easily. Let me have a guess,  he originally used a traditional E core pulse transformer that didnt have sufficent drive to fully saturate the IGBTs ??

to be honest, I'd have thought the manufacturer would be providing these FOC if the originals ones blow up .. but there you go.

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cilla.scope Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Legs all the way to her bottom.... Joined: 02 October 2009 Status: Offline Points: 2954	Post Options Post Reply Quote cilla.scope Report Post Thanks(0) Quote Reply Posted: 06 January 2010 at 11:51am
	oh righty ... I thought you were talking about a power toriod ... yeah, you should be able to wind small gate drive transformer by hand pretty easily. Let me have a guess, he originally used a traditional E core pulse transformer that didnt have sufficent drive to fully saturate the IGBTs ?? to be honest, I'd have thought the manufacturer would be providing these FOC if the originals ones blow up .. but there you go.
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James Cotton Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 27 July 2006 Status: Offline Points: 44	Post Options Post Reply Quote James Cotton Report Post Thanks(0) Quote Reply Posted: 06 January 2010 at 12:17pm
	Yep, it's a very small toroid hence the fiddly factor. There's not very many turns though so hand winding is possible. My main problem is keeping everything neat, one suggestion I picked up from a web site was to jab a chopstick in the middle of the core whilst winding each turn to keep everything in place (chopsticks are nicely tapered and soft enough not to damage the insulation) but every chopstick I have is about 2mm too small Other advice I have found is to wind these bifilar (or trifilar in this case), keep 30 degrees of the toroid free of winding and position the windings so that there is an even space on either side of the smaller ones. I think the problem with the original pulse transformers was to do with breakdown of the core material. I've sent a long email to Lee who designed them in the first place and I discovered last night that the address of his current employer is suspiciously identical to that of George's company (who supplied me with the new toroid cores) so between them they should be able to point me in the right direction. The original manufacturer C-Audio was Harmon-ised long ago and dissapeared into a dusty corner of Crown These amps date back to 1998 so warranty repairs are kinda out of the question.

cilla.scope Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Legs all the way to her bottom.... Joined: 02 October 2009 Status: Offline Points: 2954	Post Options Post Reply Quote cilla.scope Report Post Thanks(0) Quote Reply Posted: 06 January 2010 at 12:27pm
	ah yes .. 1988 is a bit old :)
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Dave FFA Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 17 November 2009 Status: Offline Points: 318	Post Options Post Reply Quote Dave FFA Report Post Thanks(0) Quote Reply Posted: 06 January 2010 at 3:28pm
	the original pulse tx where of poor quality which meant there was a gap between the core sections. the toroidal replacement pulse transformer is the easiest and best option replacement. yes george ex bss service department engineer and manager has his new audio electronics company in the same building as lee basham whom was the c-audio service guy for years harman and before at cambridge. best regards dave

kedwardsleisure Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947	Post Options Post Reply Quote kedwardsleisure Report Post Thanks(0) Quote Reply Posted: 06 January 2010 at 8:28pm
	I hate the damn things! Huge heavy pcb and that rack depth! Such a large single pcb and yet everything's still crammed in tightly! S'pose they do sound pretty good.
	Kevin North Staffordshire

ceharden Members Profile Send Private Message Find Members Posts Add to Buddy List The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776	Post Options Post Reply Quote ceharden Report Post Thanks(0) Quote Reply Posted: 06 January 2010 at 8:33pm
	Don't know what you're moaning about. It's not that heavy, or deep. The single PCB means there are no interconnects to worry about, plus you can run the amp out of the case which makes repair easy.

4D Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 13 November 2008 Location: Winchester Status: Offline Points: 4257	Post Options Post Reply Quote 4D Report Post Thanks(0) Quote Reply Posted: 06 January 2010 at 9:19pm
	What interests me is does the modded mod really make the pulse reliable ?
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ceharden Members Profile Send Private Message Find Members Posts Add to Buddy List The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776	Post Options Post Reply Quote ceharden Report Post Thanks(0) Quote Reply Posted: 06 January 2010 at 9:22pm
	I should hope so. It removes the most common failure mode of them.

Dislexic Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 21 November 2007 Location: United Kingdom Status: Offline Points: 815	Post Options Post Reply Quote Dislexic Report Post Thanks(0) Quote Reply Posted: 06 January 2010 at 10:01pm
	To go off topic I got the Crown XS900 and 4300, which I believe (correct me if i'm wrong) is crowns regurgated and improved offering of the pulse after they absorbed caudio, and they have been bullet proof, not sure of the differences tbh but works for me - will sell if anyones interested >8)
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kedwardsleisure Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947	Post Options Post Reply Quote kedwardsleisure Report Post Thanks(0) Quote Reply Posted: 06 January 2010 at 11:26pm
	As far as I'm concerned any C-Audio design after the SR range are a bit of a codge-up. I havent seen one yet that I like! What were they smoking when they designed them? Crown fitted different boards in the XS & Pulse C-audio amps which is probably why they are more reliable! And, according to Crown, their versions actually met the published specs that the originals didn't.
	Kevin North Staffordshire

ceharden Members Profile Send Private Message Find Members Posts Add to Buddy List The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776	Post Options Post Reply Quote ceharden Report Post Thanks(0) Quote Reply Posted: 06 January 2010 at 11:46pm
	The Crown Pulse is almost identical to the C-Audio one. But the XS has some significant differences, especially in the output stage heat-sinking. I think C-Audio rushed the Pulses out, if they'd have just been able to spend a little more time getting them right then they'd be great.

Dave FFA Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 17 November 2009 Status: Offline Points: 318	Post Options Post Reply Quote Dave FFA Report Post Thanks(0) Quote Reply Posted: 07 January 2010 at 3:55pm
	once modded the pulses are reliable except for the 4x 300. The only issue now is that the amps have been in circulation for 12 years and havent been in production for at least 8 years. I bought pretty much the last 16 C-Audio 2 x1100's ever made at potters bar and these i believe are still going strong. The design was rushed into production without proper beta testing and because harman had the funds to ride out the problems that occured the pulses reputation will be permanently soiled. I ATE tested the first pulses ever made and witnessed quite a few spectacular blow ups in the early days. It was quite a while before i changed my racks of SRX3801s over to the lightweights. best regards dave