Yamaha C-65 thread

[satpaul]

Hi nakmandan. Thanks for the compliment. I don't know why they didn't screw the heatsinks on, they probably didn't have any screws. I chose a +/- 16V OA OPA1642 on the left side and a +/- 19V OA LME49860 on the right. I think it paid off, or maybe the original OA are a bit old. The sound is great, the bass is fast and short, the mids are sweet but not aggressive, and the highs are silky smooth. The overall sound image has expanded and deepened. Incredible instrument placement.

Pavel

 

[Gdizard]

Adjustment and test.

View attachment 3508949View attachment 3508950View attachment 3508951
View attachment 3508952
View attachment 3508953

Done...

Pavel

You do very nice work sir!

 

[satpaul]

Thank you, it's important that this helps others too.
Pavel

 

[timblade68]

Cool stuff, let me ask about the OPAMPS, are replacements 'plug & play', or do they need a socket installed?

 

[satpaul]

Hello, you can use this for example.
Pavel

SOIC-8/DIP-8 to SIL-8 Adapter – Cimarron Technology

www.cimarrontechnology.com

 

[avionic]

Cleaning and replacement of all electrolytic capacitors. Cleaning of all switches, potentiometers.

View attachment 3508925


Heatsinks screwed with M3 and insulating washer.



Pavel

What resistor value do you have installed in R271 and R272? They look like 4.7MΩ.They should be 4.7KΩ.

 

[satpaul]

Hello avionics.
post number 13
Pavel

 

[Subtraction]

Thank you for the praise.

Pavel

You deserve it WOW NICE WORK

 

[avionic]

Hello avionics.
post number 13
Pavel

Never mind. Just repeating myself again. Carry-on men.

 

[timblade68]

Cool stuff, let me ask about the OPAMPS,

Hello, you can use this for example.
Pavel

Cool, thanx!

 

[satpaul]

Pavel

 

[Soundscape]

@satpaul . Hello sir. Just wondered if you did maintenance on the volume pot? I wanna leave mine alone honestly, maybe quirt some fader lube in there. What do you recommend?

Awesome thread by the way.

 

[timblade68]

I just used CRC electronic cleaner, squirting into the existing openings & working the pot min to max , this cleared up any issue the C65 had and it has been working flawless ever since, over 10 yrs I think.. I also used the same treatment on the remaining pots as well as on my M40 AMP.

 

[satpaul]

Hello, I use https://www.amazon.com/Hosa-F5S-H6-DeoxIT-FaderLube-Spray/dp/B00006LVF1 for potentiometers. It is specifically designed for these applications. I would especially like to point out d5, which can corrode the carbon on the potentiometer track.

Pavel