Hello Peter, They blow for a reason..... Try using a variac, and check the bias circuit before applying full power. I have never heard of a "blow" circuit. Thanx, Scott Beebe Ohm Electronics Inc. 609 W. Clinton St. Ithaca NY 14850 Voice: (607) 273-8406 Fax: (607) 273-8743 WWW.OhmElectronicsInc.com mailto:Scott@xxxxxxxxxxxxxxxxxxxxx Thursday, June 17, 2004, 3:24:19 PM, you wrote: Peter> Pioneer Peter> M4000 Peter> Amp has outputs blown, module appears to be NLA. These are Peter> nortorious for self destructing. Question is how to defeat blow circuit for Peter> testing. (question 2 what about leaving permantly disabled?) Peter> Peter Oliver Peter> Tucson Radio TV Peter> _________________________________________________________________ Peter> MSN Toolbar provides one-click access to Hotmail from any Web page ? FREE Peter> download! Peter> http://toolbar.msn.click-url.com/go/onm00200413ave/direct/01/ Peter> ----------------------------------------------------------------------------- Peter> Lost Password: Peter> http://www.tech-assist.org and select "Login Problems?". Peter> Email Archives: Peter> //www.freelists.org/archives/techassist/ ----------------------------------------------------------------------------- Lost Password: http://www.tech-assist.org and select "Login Problems?". Email Archives: //www.freelists.org/archives/techassist/