j-curve
100+ Head-Fier
- Joined
- Apr 15, 2002
- Posts
- 489
- Likes
- 11
I just discovered an interesting old thread in the DIY Discussions forum, where Matt posted
some photos of SRM-313 internals.
Compare this picture of the insides of the SRM-212 (on the left)
with one of Matt's SRM-313 shots (on the right):-
Notice anything unusual? Looks to me like the topology is identical(!), even down to the values of a few of the resistors.
The series-coupled mica capacitor pairs are replaced with what looks like single standard ceramics.
The silicon looks lighter-duty but they're all there, and the SRM-212 is claimed to be class-A.
So what's up with the bass? Obviously, the power supply capacitors are different.
Two massive (220uF) electrolytics plus an additional two medium ones are replaced with four smallish cap's.
Is that the cause? It doesn't seem to make sense because the headset is only 120pF.
Shouldn't a handful of microfarads be sufficient?
PS: Matt, I hope you don't mind my cut'n'shrink job on your image, since the link died. PM me if you want it removed.
some photos of SRM-313 internals.
Compare this picture of the insides of the SRM-212 (on the left)
with one of Matt's SRM-313 shots (on the right):-
Notice anything unusual? Looks to me like the topology is identical(!), even down to the values of a few of the resistors.
The series-coupled mica capacitor pairs are replaced with what looks like single standard ceramics.
The silicon looks lighter-duty but they're all there, and the SRM-212 is claimed to be class-A.
So what's up with the bass? Obviously, the power supply capacitors are different.
Two massive (220uF) electrolytics plus an additional two medium ones are replaced with four smallish cap's.
Is that the cause? It doesn't seem to make sense because the headset is only 120pF.
Shouldn't a handful of microfarads be sufficient?
PS: Matt, I hope you don't mind my cut'n'shrink job on your image, since the link died. PM me if you want it removed.
