VD1212 on Yamaha C4

[Hifibythekg]

Cheers Nabnassett.
The unit, hum aside, sounds really excellent so I’d like to avoid the full auto-recap at this point.
Hopefully, the ‘guvnor’ will be along presently to advise.
Although...maybe it is all the cans in the picture, or maybe even another board..?

 

[avionic]

all of them.

I would..

 

[Nabnassett]

Ya learn a lot hanging around this place.

 

[Hifibythekg]

Ha ha!
Sure do.
Is there a pre-existing list of best cap types for replacement?
I can see a BP already, and aren’t sure which ones need a PW and which need a KL or whatever..

 

[Hifibythekg]

Here’s an advanced level test.. ready?
Previous to my custodianship, somebody had to repair the extraction of the Input Wafer switch. If only they’d spoken to Dave before attempting this. Anyway, the following three photos show the repair. I think all the connections are correct, but if anyone can spot an error I would be very grateful to hear...

 

[Nashou66]

 

[avionic]

Enameled wire....Its a pain in the ass to strip enamel off for soldering. But looks a lot more professional.
I stripped down and old Weller soldering gun for the core of enameled wire.
Drastically reduces the possibility of wires getting shorted out.

 

[Hifibythekg]

Haha.
Best if I let you all inwardly digest.
Further comments gratefully accepted..

 

[Nabnassett]

Alex, I'll take 'what are other uses for paperclips?' for $200.00.

 

[Asmodeus2112]

I have seen worse?

 

[avionic]

I have seen worse?

I've repaired worse.. Just imagine if the entire board was physically cracked.. Been there ..

One of the downfalls of repairing a unit .. That someone else took a first crack at. First fix the
" root cause " then repair the induced damage.

 

[Hifibythekg]

Enameled wire....Its a pain in the ass to strip enamel off for soldering. But looks a lot more professional.
I stripped down and old Weller soldering gun for the core of enameled wire.
Drastically reduces the possibility of wires getting shorted out.

Thanks for the tip, I was thinking of trying to coat the existing wires with heatshrink but this is a far more elegant solution.
Staying with my ‘hum’ problem.. is there anything in this area of wiring that looks like the cause?

 

[avionic]

is there anything in this area of wiring that looks like the cause?

Not that is " stick out like a sore thumb " apparent.

 

[Hifibythekg]

Cheers.
Ok, I’ll go looking elsewhere for hum source..
1. Disassemble and check RCA board at the back.
2. Change those caps. Sorry to ask again but in that area should they be PW or KL’s?

 

[avionic]

PW's will work just fine. There are 8 BP's on that board.. Nichicon ES's or EP's

 

[Hifibythekg]

Something doesn’t look right on one of the wafers in this Phono switch...
Presume the whole switch has to be extracted to access and repair?

 

[amr2]

Enameled wire....Its a pain in the ass to strip enamel off for soldering. But looks a lot more professional.
I stripped down and old Weller soldering gun for the core of enameled wire.
Drastically reduces the possibility of wires getting shorted out.

for small signal, wire wrapping wire is another option

 

[Hifibythekg]

Thank you amr2 !
In this location would it be suitable do you think?

 

[amr2]

Thank you amr2 !
In this location would it be suitable do you think?

Yes

 

[Hifibythekg]

Repairable?