Bottlehead Forum

Bottlehead Kits => Kaiju Stereo 300B amp => Topic started by: slm on January 30, 2017, 12:41:45 PM

Title: Oops . I let the smoke escape
Post by: slm on January 30, 2017, 12:41:45 PM

Hi All

I just burned out the 90.9 r resistor r1 on the d side of the board in a moment eerily like H bonilla's below.

I tested the a side and it was functioning fine . When I went to do the d side I shook a little on the test probe and shorted the IA wire to the b terminal on the MJE 5731 . I am guessing that this was the cause because the smoke escaped shortly after that . Cannot find any errors in the diode string . Does a shorted transistor cause a burnout of r1 ? In which case I need a new c4s board I guess ......

Title: Re: Oops . I let the smoke escape
Post by: slm on January 30, 2017, 02:01:55 PM

I just compared resistance a to d sides . The diode string on the a ( working side ) has infinite resistance to ground and the d side only about 100 ohms - means I fried the diode string too  ?

Title: Re: Oops . I let the smoke escape
Post by: Doc B. on January 30, 2017, 07:26:06 PM

yup