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Messages - MarshallJMP

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16
Don't think the transformer is the problem since both channels share the same power supply. I "think" it might be a bad contact on the pcb since the wires from the tranny are very stiff they might move the pcb also. I would check the soldering on those big white resistors. Sometimes they desolder themself and if you get a bad contact it can blow the mosfet's. Anyway that's what I "think" 

But when you replace the mosfet's I would also change the drive transistors and check those signal diodes also.

17
Discussions / Re: Thank you MJMP
« on: Time Format »
Wow thanks guys, but I'm not the only one who deserve this, ALL of you help out one way or the other so a BIG thanks to ... EVERYBODY over here at the depot!!!  :bow:
+1  :thumb-up: we are just all part of the whole, we all bring to it what we can, so many good contributions from lots of people, so from me a BIG thanks to everybody who make the depot as good as we can make it  :headbanger:

+1 :thumb-up:

18
Discussions / Re: Thank you MJMP
« on: Time Format »
Wow thanks guys, but I'm not the only one who deserve this, ALL of you help out one way or the other so a BIG thanks to ... EVERYBODY over here at the depot!!!  :bow:

19
Troubleshooting Problems / Re: Help with MC-1
« on: Time Format »
I would put the mp-1 parallel with the MB-1, this way you still have the low end of the bass and the mids/ highs from the mp-1 (with distortion).Maybe use a small rack mixer for this?

So both MP-1 and MB-1 are switching with the tech 21?

21
Original MP-1 / Re: Fixing Richards 240v MP-1
« on: Time Format »
Midi, maybe a bad contact in the ribbon cable connectors, have you tried to pull it out and put it back in again?

Another thing to try is replacing the diodes D38,D39 these can fail sometimes giving an unstable 5V to the ┬ÁP at startup.

22
Airpressure, humidity, temperature? Those can have an influence on the sound sometimes.

Beer? Too much beer? too many beers???  :facepalm: :wave: :lol:

Hahahahaha  :thumb-up:

23
No not really, I want to lower the output of the tubeboard a bit. Not sure if this will help but it won't hurt anything.

24
Troubleshooting Problems / Re: Help with MC-1
« on: Time Format »
Ok let me know how that goes

BTW did you got my email?

25
Troubleshooting Problems / Re: Help with MC-1
« on: Time Format »
Well what you can try is hook up the MP-1 midi out to the MB-1 midi in and change the preset by hand on the mp-1, normally the mp-1 sends out a program change if you change the preset. This way you try to test if the midi in of the MB-1 works. Vice versa should also work although I'm not 100% sure the MB-1 sends out program changes on the midi out, but I guess it does.

Another possibility is using a soundcard that has a midi in (or a usb to midi cable) and using bome sendsx, hookup the MC-1 to the midi in and this way you can see if the MC-1 is sending out midi commands.

https://www.bome.com/products/sendsx

So when you push a button you should have to see 2 bytes of data coming in. Let's say you send preset 1 on channel 16 then you should see
CF 00
C is program change in hex
F is the channel number in hex (F=15 but you need to add 1 to it)
00 is preset one also in hex (it's actually 0 but most midi devices add 1 to the preset nr)

So the MC-1 is sending out 1100 1111 0000 0000 bit wise and this is what actually comes out of it.

Another one, let's say preset 12 on channel 2
C1 0B or 1100 0001 0000 1011

Now on the other hand you can also use bome sendsx to transmit midi, hookup the midi out of your midi device to the midi in of either the mp-1/mb-1 and type a program change into the midi out box.
Let's say C0 00 this will send preset 1 on midi channel 1.

It works great for checking midi in and out's on midi devices.

26
Original MP-1 / Re: Fixing Richards 240v MP-1
« on: Time Format »
Ah yes I see it now, stupid of me  :facepalm:

27
Well I thought about something, with the higher MDRT voltage, the output voltage of the tube board will also be higher, maybe with some tubes it could be to high for the digital pots. I'll do some experimenting this week, see what I can figure out. Now should this be the problem you can easily solve it by replacing one resistor on the tubeboard so the input voltage on the digital pot is lower.

28
Well it seems you got lucky  ;D I would never risked doing this, but no pain no gain  ::)

Now if you want to use a small housing you could still use the schematic i gave you. You don't have to wire up all the switches should you wish to discard some.

BTW a ADA TFX-4 footswitch would also work.

A question to the viper owners, when you hook up the switch and you change the channel on the amp do the leds on the switch change? Normally they should, just curious.

29
Original MP-1 / Re: Fixing Richards 240v MP-1
« on: Time Format »
What's a power relater????

So it starts up or does it get stuck in the boot sequence?

30
Combo Amps / Re: NGD: Super Clean VIPER!!
« on: Time Format »
Thanks Kim  :thumb-up:

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