• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

P800 rebuild problem

I will suggest replacing both H808 and H811 and use a 100W bulb on DBT. I assumed you have checked all the transistors on P800
 
When I check the dual diodes with a DMM, I placed one lead on the middle pin and one on an outer pin, repeating for the other pin. One orientation produces an audible sound while switching the red and black leads yields no sound. The lamp i have connected to the dim bulb tester is 150watt 120v.
 
All five 2383 transistors have been replaced with new ones. On a DMM, what reading would one expect with the MUR1620? I will disconnect the preamp board and P700 boards before next attempting testing. I'll also change the bulb to 100w.
 
I'm happy to report that i have achieved success. Changed out P800 board and redid everything since the existing board just kept being problematic Checked all connections. Board is calibrated to 35mv output @ J804 & J805. I also calibrated the amp boards to 20mv DC after remembering to replug the P700 and P300 boards back in.
 
You must log in or register to reply here.
Back
Top Bottom