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Lets get Technical > All Things Tube All about preamp and power amp Tubes.

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Messages - MarshallJMP

Pages: [1] 2 3 ... 230
1
Troubleshooting Problems / Re: Help with MC-1
« on: Today at 01:32 PM »
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.

2
Original MP-1 / Re: Fixing Richards 240v MP-1
« on: Today at 12:48 PM »
Ah yes I see it now, stupid of me  :facepalm:

3
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.

4
Step On It! / Re: Making a Snakecharmer Footswitch
« on: Today at 10:15 AM »
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.

5
Original MP-1 / Re: Fixing Richards 240v MP-1
« on: Today at 05:27 AM »
What's a power relater????

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

6
Combo Amps / Re: NGD: Super Clean VIPER!!
« on: Today at 05:25 AM »
Thanks Kim  :thumb-up:

7
if it's a momentary switch, then yes.

8
A quad switch won't work  ;D but here's the schematic

9
Maybe you could start simple with just 4 switches (no led's). Not 100% sure it will work this way but it's easy to build so you could give it a shot.
You need 4 momentary switches (S1-4), 4 resistors (R1-4) and a female stereo jack (J1).
The J1 connection from top to bottom are tip, ring, sleeve. Resistors can vary between 1k and 1k5. (but 4 times the same value).

Let me know if you have any questions

10
Airpressure, humidity, temperature? Those can have an influence on the sound sometimes.

11
Combo Amps / Re: NGD: Super Clean VIPER!!
« on: Time Format »
Half-correct bro. The channel switching can be done both manually and via the foot switch since there's a relais (triggered by an electrical impulse) in the circuit (inside the amp). I doubt that there are relais in there for the voicing and cab sim switches.
MJMP sure can shed some insight on that

There are no relays inside, the channel and boost switching is all done in an electronic way. For the other ones it's just a switch that switches stuff in and out.

12
Combo Amps / Re: NGD: Super Clean VIPER!!
« on: Time Format »
Quick question, for the channel and boost switching on the amp, are these momentary switches or do they latch?

13
Did you try to replace those parts we talked about?

14
Guitars / Re: Arrogantia guitars
« on: Time Format »
Wauw, looks really nice!!!!!!!!!! 8)

15
Combo Amps / Re: NGD: Super Clean VIPER!!
« on: Time Format »
The original switch has only 4 switches according to the schematics and pic's I found on the net. It has green, green boost, red and red boost.
I attached the schematic of the switch. You could make one quite easily just with 4 buttons, 4 resistors and a stereo input jack.(R219-R222, Sw12-15,J7)
Downside is you don't have the LED feedback. For this you will have to make the whole schematic.

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