Gervais Cote
Predator
Hi gents,
As mentioned in the title, I'm on my way to refurbish a nice example of a Musical Fidelity dual mono power amplifier P170, serial no. 3466.
So far, in good shape, no major trace of overheating but all the electrolytic capacitors are original so they are due for replacement with next higher voltage available as always with that brand.
My main concern is more about the output transistors. They are in a good condition electrically speaking but some of them have broken leads due to an impact that occurred on the cooling fins to which they are attached with screws.
These output transistors are not available as they are from Hitachi and they no longer make them.
I would like to see if any of you would know what would be the exact replacement electrically speaking, same center distance for the 3 leads although the shape would be slightly different.
I am comfortable with the fact I will have to drill and tap new holes to hold the new transistors to the fins as long as the function and sound signature remains the same, all good for me.
There are 2 Hitachi transistors no. J83 6C2 (green) and 2 others are K227 6B2 as per picture below.
Also would like to know how to adjust the bias and what value should it be if any of you has the info.
Thanks in advance.
As mentioned in the title, I'm on my way to refurbish a nice example of a Musical Fidelity dual mono power amplifier P170, serial no. 3466.
So far, in good shape, no major trace of overheating but all the electrolytic capacitors are original so they are due for replacement with next higher voltage available as always with that brand.
My main concern is more about the output transistors. They are in a good condition electrically speaking but some of them have broken leads due to an impact that occurred on the cooling fins to which they are attached with screws.
These output transistors are not available as they are from Hitachi and they no longer make them.
I would like to see if any of you would know what would be the exact replacement electrically speaking, same center distance for the 3 leads although the shape would be slightly different.
I am comfortable with the fact I will have to drill and tap new holes to hold the new transistors to the fins as long as the function and sound signature remains the same, all good for me.
There are 2 Hitachi transistors no. J83 6C2 (green) and 2 others are K227 6B2 as per picture below.
Also would like to know how to adjust the bias and what value should it be if any of you has the info.
Thanks in advance.