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S Merlington 20th April 2013 04:13 AM

Rockford Fosgate 800A2
Amp is using the MMBTA56's and 06's as the drivers in the power supply..

Will the MMBTA42 and 92 work in there place ??

seankane 20th April 2013 04:44 AM

I have used MMBTA56/MMBTA06 and MMBT3904/MMBT3906 and had success with both.

I have not tried the MMBT42/MMBT92, you could try them and see.

seankane 20th April 2013 07:39 AM

The 42's/92's are for high voltage applications with specs almost 4 times the original part.

I would use the might want a second opinion.

Perry Babin 21st April 2013 12:40 AM

The 42/92 have lower gain and may not work well. The others suggested will work properly.

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