Yet Another M-80 Restore With Opinions Needed

[ivandezande]

This guy somehow hasn't blow up yet. Glue, corrosion, broken binding posts waiting to short out, you name it, it's got it. Serial 3301.
My main question is; is it worth dealing with? Looks to be +60 components from diodes to jumpers that I'll have to replace. Feet are gone. Side panels are gone. Binding posts are kaput.

But if it is: what's a good binding post solution that you've seen? Feet seem impossible to find, is there a rack mount kit for the side panels or something?
It's looking like a 6 month mess at this point.

 

[Guest125]

I ordered binding posts out of Europe at https://speaker-terminal.com/en/produkt/yamaha-m80-85-speaker-terminal/

 

[ivandezande]

I ordered binding posts out or Europe at https://speaker-terminal.com/en/produkt/yamaha-m80-85-speaker-terminal/

View attachment 1279671

Dang those are nice, but I can't swing the 106 plus shipping. Thanks though!

 

[OMGCat!]

You can make your own posts much like those fancy ones.
There are nice machined aluminum feet for sale cheap on eBay you can buy. Side panels I'm not so sure but you should be able to source them from any of the M amp line.
Other than that, I'd fix it up just for fun especially since it's not actually blown up.

 

[mbz]

I couldn't afford the european ones so sadly resorted to the bay,
https://www.ebay.com/itm/8Pcs-4mm-A...nding-Post-Banana-Plug-Jack-A1S3/253343446576

Used them on CA-1000, 1010, 2010.

 

[avionic]

I'm using vampirewire posts on a 1010 at the moment.
https://www.vampirewire.com/product-page/bp-3

 

[Asmodeus2112]

What did you decide?

 

[avionic]

Feet seem impossible to find,

M-40,45,60,65,80 and 85 should all be the same. -- Leg ass'y NB620320. Shouldn't have been that hard.


Nother darn zombie thread

 

[ivandezande]

Sorry forgot to update - couldn't even get it going again yet, just so many parts I had to replace I must have goofed somewhere. It's not shorted but it won't come out of protection, I'll get there eventually.

 

[avionic]

Did you check or replace all the bad fusibles? Diodes ( zeners)?

 

[zaibatsu]

Have you got it on a DBT while testing?
If not, would definitely be wise, but if so, remember it needs a 150W bulb (or for the bias pots to be set to 0mV / minimum with 100W bulb) before it'll come out of protection.

When you say it hasn't blown up shorted though, does that mean it originally did come out of protection, and doesn't anymore?

 

[ivandezande]

Did you check or replace all the bad fusibles? Diodes ( zeners)?

Fusables are gone, I need to check on the zeners, most I believe I replaced if not all.

 

[ivandezande]

Have you got it on a DBT while testing?
If not, would definitely be wise, but if so, remember it needs a 150W bulb (or for the bias pots to be set to 0mV / minimum with 100W bulb) before it'll come out of protection.

When you say it hasn't blown up shorted though, does that mean it originally did come out of protection, and doesn't anymore?

It used to work fine. I have it on a 100W right now I believe, I'll try adding some wattage.

 

[milo63]

Here's my M-60 post fix, Still working fine.

https://audiokarma.org/forums/index.php?threads/m-60-new-post-wiring.829000/

 

[zaibatsu]

It used to work fine. I have it on a 100W right now I believe, I'll try adding some wattage.

Is the bulb staying bright when it stays in protection?
If it is staying bright then this could be the problem, but if it's dim it won't be.

I'd try zeroing the bias pots first (i.e. no bias: 0mV) with the 100W you have, that way you can't send any more current through and make any existing problem worse. If that doesn't work, try a 120-150W. Class A switch needs to be "off" obviously.

 

[amr2]

100W is enough with class A off and no bias voltage

 

[Dana65]

I ordered from this company and installed the new speaker post very high quality excellent product and worth the money.

YAMAHA M80 / 85 Speaker terminal - speaker-terminal.com

High-quality speaker terminal as a spare part for YAMAHA M80 / 85

speaker-terminal.com

 

[avionic]

Zombie thread alert.

I ordered from this company and installed the new speaker post very high quality excellent product and worth the money.

YAMAHA M80 / 85 Speaker terminal - speaker-terminal.com

High-quality speaker terminal as a spare part for YAMAHA M80 / 85

speaker-terminal.com

Well made pieces.. Recently installed a set on and M-85..