you can adjust DC offset without the v-fets installed, right ?Unfortunately the procedure in the manual requires the V-FET's to be installed for the adjustments.
Yes you can but it's somewhat dangerous.
I hope that it is clear for you
Sorry but for obvious reasons I'd rather not be the one posting dangerous procedures ...before you bring in the v-fets?
Sorry but for obvious reasons I'd rather not be the one posting dangerous procedures ...
well, I kind of wanted the resident experts (you and VintAge) to set the expectations for the rest of usAll risky procedures will not be given here .
I love mine too, but I am also aware of its limitations...my PEAK ATLAS is really fine enougth !
And I would not expect any differnt from a Yamaha tech with your experienceEach unit I switch ON is working perfectly
Hi Patrice, I was gonna mention that the Tex tracers are more rare, hence cost more in EU, because they (the Tex tracers) prefer to hang out here on the West Coast. We have better weatherI don't need to buy TEKTRO curves tracer because the cost will never be refund by repairs before 35 years ....I will not be here in 35years
I did not see an answer as to what work you did to the driver boards of the B-2.2??Ok here's an update.
I opened up my working B2.1, [made sure the caps were drained, pulled out the VFETs in a very organized manner <--that's for you Pete] and took measurements between the Red and White wires. Both sides measured almost exactly at 124v without the VFETs just like the other B2 (B2.2).
So, unless someone sees an open man hole cover in my path, I think I am ready to put B2.2 back together and test her. Of course I assume all risks of doing so.
From my notes I replaced the following on the Driver Circuit Boards in B2.2:
C114
L-VR101
R-VR101
L-VR102
R-VR102
D101
D102
D110
D111
Sorry but for obvious reasons I'd rather not be the one posting dangerous procedures ...
But if you or anyone else would be willing to send me a private message with this information it would be appreciated.
The problem is not in posting how to do it , but you don't have the knowledge to do it , that the problem and risk to destroy your V FET
If any one was able to repair a B2 (or B1, or any other V FET Amp ) everybody knows that this is not so easy
Sharing info , OK
Sharing experience this is not possible
Anyone can not claim to be a qualified technician
So here's an update on what I did and the final results. First I had some conversations outside of this forum with someone who explained to me in detail the steps necessary and associated risks of testing a B2 without the VFETs installed. The phrase "Fools rush in where angels fear to tread" came to mind. And since my Momma didn't raise no fool I decided not to tread there. Instead, I carefully reviewed and double checked everything I had done to the amp and compared all parts I had installed to my other working and refurbished B2 amp to make sure all parts were installed correctly. I even pulling a number of transistors to verify them.
I installed the VFETs. Powered her up (gulp) and performed all the adjustments as required with no issues. She has been in my main listening system playing gloriously for the past two days.
So here's an update on what I did and the final results. First I had some conversations outside of this forum with someone who explained to me in detail the steps necessary and associated risks of testing a B2 without the VFETs installed. The phrase "Fools rush in where angels fear to tread" came to mind. And since my Momma didn't raise no fool I decided not to tread there. Instead, I carefully reviewed and double checked everything I had done to the amp and compared all parts I had installed to my other working and refurbished B2 amp to make sure all parts were installed correctly. I even pulling a number of transistors to verify them.
I installed the VFETs. Powered her up (gulp) and performed all the adjustments as required with no issues. She has been in my main listening system playing gloriously for the past two days.