I was asked by a friend if I could look at an Acoustic G60-212 solid state guitar amplifier, to see if I could get going.
Found the drivers/finals to be blown, and now it works but isn't very loud.
Replaced the finals Q5/Q8 with 2N3055G and drivers Q4 with 2N5415 and Q7 with 2N3440
The measurements essentially show R6 in its centered position 4.7K ohms
If I turn R6 clockwise down to around 1.3K ohms, the amp really wakes up and sounds much better... But... the drivers get very Hot! 250F for Q7 and 200F for Q5
Another thing is the finals stay cool no matter the position of R6.
I am a definite Newb for amps, but have worked on other electronics for most of my adult life.
(I know which end of the soldering iron to grab..🙂
Any insights are definitely appreciated!
Found the drivers/finals to be blown, and now it works but isn't very loud.
Replaced the finals Q5/Q8 with 2N3055G and drivers Q4 with 2N5415 and Q7 with 2N3440
The measurements essentially show R6 in its centered position 4.7K ohms
If I turn R6 clockwise down to around 1.3K ohms, the amp really wakes up and sounds much better... But... the drivers get very Hot! 250F for Q7 and 200F for Q5
Another thing is the finals stay cool no matter the position of R6.
I am a definite Newb for amps, but have worked on other electronics for most of my adult life.
(I know which end of the soldering iron to grab..🙂
Any insights are definitely appreciated!
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