Old Fidelity - HiFi Klassiker Forum

(23.04.2017, 16:51)EoA schrieb: [ -> ]Hi,

after a Sony 313L landed on my desk by a mistake, in which a channel was only dangerous humming of itself, I dug up this thread here.

A view of the bay made an interesting offer. A prepared modification as described by Poetry2me. And since all changes for the replacement of the Sanken SI 1225HD by the LM3886 were already on the finished board, I decided to buy.

I'm assuming that Poetry2me makes the whole thing, since all documents are also in the thread here and also referred to the thread.

So pure ind the pleasure:

1. the disassembled 313L 2. The SI 1125 is out. 3. The new kit is already mounted on the heat sink.











4. Assembled and tested - OK!
5th I just wanted to replace the Bleuchtung for tuners, stereo and program search - nothing suitable because - so first provisionally soldered something.
6. Determined that the 313L only receives in mono (the prov. Bulb did not light up ...)
7. Trimmer for the stereo decoder cleaned and made common - stereo reception ok
8. noise detected on the right phono input - disappears Source connected, probably a deaf Elko in the entrance - on later moved.
9. cleaned and provisionally assembled - until the lamps are from Klaus ... Sound and performance of the new power amplifiers are really great !! Can anyone recommend this modification. VG Sascha








Hi EOA,

I have a similar issue with my SONY 313L receiver, broken Sanken SI 1225HD IC.  I already purchase two LM3886 and since I am beginner in electronics and I dont have clue what pin goes where, so I would be very thankful if you can provide me some schematic or picture of board where LM3886 is placed and wire connections.
I already take out old SI 1225HD and place new two LM3886 on heat sink.
As I can understand I need to add 2 more 47mF capacitors?
Should I take out old capacitors (C661,C662,C611,C612) and bridge them?
thanks and best regards
Zoran

(10.01.2019, 23:21)Poetry2me schrieb: [ -> ]

Hi Zoran,

this is how I would do it. Don't care too much about the extra caps I recommended in the original TA-313 solution. These were just additional bypass for the positive rail.

As far a I can remember, the two LM3886 need to be of the isolated F type (plastic back) or otherwise need a silicon pad for isolation when mounted. Check in the old posts in this thread.
Pin 9 of the original SI1125HD pinout is in common for both channels, as positive rail.

Hope this helps. Let us know how it worked out.

regards
Johannes