Help needed with a TSL 100 head !!

[st220]

From a quick look two other things were different. There were con15 and con16 connectors on the new board that were not on the old board. The layout and everything else looked pretty much the same in layout. I haven't gone through each component. I did notice that most of the resistors were metal film versus carbon on the old board, C46 (if I remember correctly) was beefed up, and the board looked of much better quality.

Yes I had the same.
The new bd was from a vintage modern amp, I also recall several extra connection
posts that I did not use. I just made sure that every lead I had was connected to the corresponding
post on the new board, as long as everything is connected and you have nothing over...your
pretty much done. You need to make sure that you BIAS the tubes to the new board, you
will find it much easier to get a steady reading from all 4 power tubes, I set mine to just under
90ma so the tubes run cooler that Marshall recommend. Do not assume your new board is
BIASED when you un packed it...it won't be !!!!!

[SidMEF]

Yes I had the same.
The new bd was from a vintage modern amp, I also recall several extra connection
posts that I did not use. I just made sure that every lead I had was connected to the corresponding
post on the new board, as long as everything is connected and you have nothing over...your
pretty much done. You need to make sure that you BIAS the tubes to the new board, you
will find it much easier to get a steady reading from all 4 power tubes, I set mine to just under
90ma so the tubes run cooler that Marshall recommend. Do not assume your new board is
BIASED when you un packed it...it won't be !!!!!

Will do. That is one reason I'm replacing the board. I had the runaway bias and heat problem.
Thanks for all your responses.

[st220]

Will do. That is one reason I'm replacing the board. I had the runaway bias and heat problem.
Thanks for all your responses.

No worries..hope all goes well.

Eurotubes - Marshall DSL-TSL-JVM "How to" Bias Video

May help when your all connected.

[smjoe]

marshall pcb JCM2-60-00 issue 20

No worries..hope all goes well.

Eurotubes - Marshall DSL-TSL-JVM "How to" Bias Video

May help when your all connected.

yes I have a JCM2-60-00 issue 20 pcb with extra con 15 and 16 .I just purchased a overdrive board that has 2 xtra connectors con 21 and con 22
would con 15 and con 16 then connect to con 21 and con22 the overdrive board is also issue 20
aqnybody know