Yamaha c70 Part ID

[mercedesjenz]

Hi there,
does anybody out there have a Yamaha C-70 preamp?

I have just taken delivery of one and SW503 is missing, with the pins having been jumpered. I think it is the tone control bypass switch.

It sits under the stand-off control board on the power supply pcb.
All it says in the service manual is "magnetic switch".

Would you mind terribly popping the lid off yours and telling me the part number/manufacturer? A photo would be even better!

Ta muchly

 

[JonSnell Electronic]

SW503, from memory as an Authorised Yamaha Repair Centre, is the tone control parametric defeat switch. I think it was a double pole double throw. Why it is missing, I wouldn't know as they never gave trouble. Probably made for Yamaha by Alps.
The Yamaha part number is in the service manual.

 

[mercedesjenz]

Ta muchly, just as I thought.
No idea why it is missing. There has been some botching going on. Looks like this will be a messy rebuild. Some of those HB2E relais are broken, too (i.e. they are physically damaged). Worth it?

You wouldn't know if there is an off the shelf replacement? I live near Farnell's...

 

[mercedesjenz]

Hi Jon, from memory, does the part look something like this? DS4E-S-DC24V Nais relays 200mW Single side stable DC 24V | eBay

Yamaha don't carry anything for the C-70 anymore and they can't help at all, so relying on your powers of recall...

Thanks

Jens