rlisin
Quad 4 life
I have just bought and received a Marantz 2325, poor cosmetics (needs a new faceplate, bolts and 1 button, which Im'm getting next week, hopefully). But it works perfectly. I adjusted DC offset and bias without any problems (if you don't count a bit confusing marking of the test pin J708), but there's one problem.
I read in a few threads that VD1221M diodes H718 and H719 should be replaced with 1S1555a or 1N4148 for safety reasons, but later in the production Marantz installed 1S1555a (that do not need to be replaced). My 2325 is from Feb. 1977, not sure if that qualifies as "later production). And the problem is I could not find any pics of a VD1221M diode online. I did find pics of VD1221 (without "M"), which looks like a black blob on a wire, am I correct to assume that VD1221M looks like that too?
What I have in my 2325 is this:
It looks like a 1S1555a diode and I assume it is, but would be grateful if someone who knows (and not guesses like I do) could confirm.
Here's a few more pics of my 2325
And apparently its new owner:
I read in a few threads that VD1221M diodes H718 and H719 should be replaced with 1S1555a or 1N4148 for safety reasons, but later in the production Marantz installed 1S1555a (that do not need to be replaced). My 2325 is from Feb. 1977, not sure if that qualifies as "later production). And the problem is I could not find any pics of a VD1221M diode online. I did find pics of VD1221 (without "M"), which looks like a black blob on a wire, am I correct to assume that VD1221M looks like that too?
What I have in my 2325 is this:
It looks like a 1S1555a diode and I assume it is, but would be grateful if someone who knows (and not guesses like I do) could confirm.
Here's a few more pics of my 2325
And apparently its new owner: