marquee 9500 neckboard repairs.

Just got three more nechboards two with motorolla in the 98** range and one in the 95** range. I remember that my not so good MP boards had motorolla and non motorolla transistors.

hope to do some tests soon but doubt if they will be better than what I have now. Just to stop some confusion this is what I have now.

Lets ponder a bit further on this neckboard problems. I need some people thinking with me here.

It all started with me receving neckboards from Mike that had low bandwidth. Mike asked me to change a few resistors in the driver area. That did not help. Than he concluded that it was most likely the boards. He said some boards can not be modified into high bandwidth. The strange thing was that he send me those boards so why did he not know that these boards where low bandwidth?

Now I was so bad to do things on my own and I took all modifications to another neckboard. After that I tested and the bandwidth was low still. It was even lower with the modifications than without them!

Now I compared all the modifications with strid his boards and his boards performed high he said. Also thewolfmans board had the same parts only little potting was used there. It trned out that thewolfmans board where also low on bandwidth.

Ok after the unsuccesfull modtransplant I concluded that I must have been unlucky and had tried two neckboards that where low on bandwidth to start with. That hypotheses was tested by buying boards from Curt and from two other sources. So I bought 8 neckboards. I ended up with two very good and one good neckboard. Perhaps one more was good if I remeber well. So lets say 4 out of 9 where good.

Now knowing that some boards do just not perform as Mike says himself why did he send them to me and the wolfman? He must have known that as he tested them.

I compared the opamp with strid and perhaps strid has a different one there but his resistor vallues where the same. Also I could figure out the number of the opamp after using magnifiers and because Mike scratched bad relying on the potting I guess. They where scratched but with the right light I could recognise a few characters and identify them. So why would Mike hide an opamp if it was a bad one? Why would he send me a bad opamp? I can only conclude he send me bad boards knowing that.

Do I miss something here?

Is it possible that Mike is not capable of modifying a lot of neckboards to high bandwidth despite advertising? 

Or perhaps a mistake?

Edited some ideas away.

Yes good point about the tubes and I do not have prove that someone could play those tricks. But it is important information for anyone that buys modifications. We should know that there are things that might not bring out the high bandwidth we hope for.

it is just that I bought a complete set of a 2008 machine from Curt that probable was 2005 and that included 3 new neckboards. I saw nothing special about one of them and when I got them back one was a very old board. But it could have been that I did not notice and that Curt did not notice.

ok I admit it I am wrong. I looked at old pictures again and there is a dot of glue on the board I send him that is exactly the same on the received board. Also other identifications match so I am wrong in this. Pfffffff I am happy I am wrong.

It is just difficult to believe that he could make so much mistakes but it seems to be the truth.