yep, I had two M-2s for a while but was way more power than I needed. I was satisfied with running them until i heard the B-2.
Yes thats right,the B2 is bullet proof,and as Vintage said , relays big issue.
Also the contacts in the input selector switch wear through the coating and become problematic.I did mention at one point that Yamaha supplied contacts to repair these switches.(many years ago of course)
The B2 is beautifully designed, with plug in drive boards, its where art meets glorious function
Yeah, I cycle my switches a few times before power on to make sure there are good contacts. I am seriously considering bypassing all the switches and volume pots on my B-2 just to give me confidence I have solid connectons. Can't be too hard to do this?
Besides being a wonderful sounding amp, the B-2 is practically bullet proof.
Too bad the B-1 is so touchy.
EchoWars has flat refused to work on a B-1 again .
Yes indeed and if it is true I'll bet they'll be gone in no time ...
WHat do you think about that ?? :scratch2:
Actually, excluding the protection relay, there are only 2 switches in the B-2 signal path. One is on rear and selects between direct and capacitive input coupling and the other is on the front and selects between inputs A or B. The other switches simply route the 12V protection relay coil voltage for speakers A or B and speakers off or on so with that said it wouldn't be too difficult to bypass the input attenuators and switches for a more reliable signal path.
The protection relays are a more serious issue. They can be bypassed too but that's something I would never do for fear of speaker damage. The nicer answer for those would be to replace them with a DIY solid state relay arrangement ... but that would need to be carefully designed. :scratch2:
It's not the most impressive looking little amp, but man do they make beautiful music!
Yours does look to be in very nice cosmetic shape. :thmbsp:
He was a cool guy who used to play in a rock band. Definitely a product of the 60s. Looked like a Dead Head. He restored electric guitars and had several dozens all over his home...
I might open it up and see if I have the "A" fets in it too..
let me think that this is really strange ......See the picture we can see on their site and the picture I add to this message .....
WHat do you think about that ?? :scratch2:
Hello !
Sorry but what "A'S " or non "A'S" transistors are you talking about ?
:scratch2:
Renasas and Exicon still makes them .who killed the Lateral MOSFETs