Trying to fix a Marantz 2216 Part 1 of ?

Thread Starter

thisandthat

Joined Mar 1, 2014
3
Picked this old project up again.
I'm out of practice working on electronics but did enjoy it in college.

Got a tone on the input, increased the volume until I got about a 1VAC on the main amplifier input.
Checked the DC voltages and they seem ok, however one channel is not amplifying. I'm thinking it is one of the main power transistors.

It has one 2SD313, and one 2SB507 on each channel doing the work.

I've got a little video on my measurements.
Video

I was hoping someone could give some suggestions if I'm on the right track, as well as how to find these old transistors.
 

MrSalts

Joined Apr 2, 2020
1,504
Picked this old project up again.
I'm out of practice working on electronics but did enjoy it in college.

Got a tone on the input, increased the volume until I got about a 1VAC on the main amplifier input.
Checked the DC voltages and they seem ok, however one channel is not amplifying. I'm thinking it is one of the main power transistors.

It has one 2SD313, and one 2SB507 on each channel doing the work.

I've got a little video on my measurements.
Video

I was hoping someone could give some suggestions if I'm on the right track, as well as how to find these old transistors.
You can try to find the originals or get some pin-compatible replacements with similar specs.
 
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