Mark IV head noob questions

Mark I's, II's, III's and the almight IV

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Ime11
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Mark IV head noob questions

Post by Ime11 » Mon May 29, 2017 2:42 pm

I recently got a Mark IV head which works fine and sounds great but when I turn the output volume to 0 it still sounds. It is very quiet but I would assume that at zero volume it should be completely quiet. It is normal or something is wrong with my amp?
Also, I would like to use the speaker of my Mark V 35 combo (it is 90 watt and 8 ohm) with my Mark IV head. What I would do is connect the speaker jack to the 8 Ohm input jack of the amp. My question is: Do I need to connect the speaker to a source of voltage?

Thanks in advance

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jediguitarist
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Re: Mark IV head noob questions

Post by jediguitarist » Mon May 29, 2017 8:39 pm

Can't help you with the first part, but all you need to do is connect the speaker to the to the speaker out on the Mark IV head. It would be the same as connecting an external speaker cabinet. You might need to extend the cable to reach the head, though.

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Ime11
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Re: Mark IV head noob questions

Post by Ime11 » Mon May 29, 2017 9:06 pm

jediguitarist wrote:Can't help you with the first part, but all you need to do is connect the speaker to the to the speaker out on the Mark IV head. It would be the same as connecting an external speaker cabinet. You might need to extend the cable to reach the head, though.
So when you turn the "output level" knob to zero on your mark IV it is completely quiet?
Thanks!

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jediguitarist
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Re: Mark IV head noob questions

Post by jediguitarist » Mon May 29, 2017 9:11 pm

Yes, it's completely quiet. It sounds like the volume pot could have drifted so that zero doesn't send the signal to ground. If you send an email to Mesa tech support, they could tell you more. If everything else is working correctly, it could mean replacing the volume pot. Does it happen on all the channels?

93 97 98 PRS CE24
94 98 G&L Legacy
94 G&L ASAT Special
95 G&L S-500
99 Peavy Wolfgang
11 Gibson LP Studio 60

69 Bandmaster Head
88 Quad Pre
91 & 92 Simul 295
92 DC-5
96 Mark IV Maple/Wicker
98 5150 combo
08 Mark IV Wide

Ime11
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Re: Mark IV head noob questions

Post by Ime11 » Mon May 29, 2017 9:29 pm

jediguitarist wrote:Yes, it's completely quiet. It sounds like the volume pot could have drifted so that zero doesn't send the signal to ground. If you send an email to Mesa tech support, they could tell you more. If everything else is working correctly, it could mean replacing the volume pot. Does it happen on all the channels?
Yeah it happens on all channels. It doesn't seem to be a big deal but now I am more worried about it D:

bgh
Mark III
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Re: Mark IV head noob questions

Post by bgh » Wed May 31, 2017 10:59 am

Somehow I missed this thread when it was started. The OP sent me and IM about my experiences. For others viewing this thread, I thought I probably should add them to it.

My Mark IV seems to behave kind of like the OP's behaves.

If I turn my master output to 0, and turn the channel output for channel 2 (for example) to 10, I get output. Not a lot of output, but some. I can hear it while I am standing in front of the amp. But, it is not loud enough to play alongside someone else. In other words, some volume (plenty for bedroom use) but not enough for playing out.

Conversely, the same level of volume (low enough for bedroom use but not enough for anything else) can be achieved if I set the channel 2 output to 0, and the master output to 10.

Because it does that in both directions, I figured it was acting as designed. It seems like if it was a pot issue, then the master output, the channel 2 output, and the channel 3 output all failed in exactly the same way.

Once I got to this point, I figured it was working as designed and didn't worry about it anymore.

PS: The TMB control work the same. Turn them all to zero (doesn't matter which channel) and you still get output.

PS2: On channels 2 and 3, turn the gain to zero, and nothing comes out (which makes sense).

I hope this made sense. If not, let me know and I will try to explain my findings better.
Lefty guitars: Gibson SG standard (1977) • Gibson LP custom (1979)
Amps and such: Mesa Boogie Mark IV-B • Mesa Nomad 45 • Mesa TA-30 • Effectrode Blackbird • Kingsley Jester • AMT SS-11a • Zoom G5

Ime11
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Re: Mark IV head noob questions

Post by Ime11 » Sun Jun 04, 2017 10:37 am

bgh wrote:Somehow I missed this thread when it was started. The OP sent me and IM about my experiences. For others viewing this thread, I thought I probably should add them to it.

My Mark IV seems to behave kind of like the OP's behaves.

If I turn my master output to 0, and turn the channel output for channel 2 (for example) to 10, I get output. Not a lot of output, but some. I can hear it while I am standing in front of the amp. But, it is not loud enough to play alongside someone else. In other words, some volume (plenty for bedroom use) but not enough for playing out.

Conversely, the same level of volume (low enough for bedroom use but not enough for anything else) can be achieved if I set the channel 2 output to 0, and the master output to 10.

Because it does that in both directions, I figured it was acting as designed. It seems like if it was a pot issue, then the master output, the channel 2 output, and the channel 3 output all failed in exactly the same way.

Once I got to this point, I figured it was working as designed and didn't worry about it anymore.

PS: The TMB control work the same. Turn them all to zero (doesn't matter which channel) and you still get output.

PS2: On channels 2 and 3, turn the gain to zero, and nothing comes out (which makes sense).

I hope this made sense. If not, let me know and I will try to explain my findings better.
Thanks for sharing your experience. I have another noob question: How hot can get the chassis and is consider normal? How can I know if an amp is overheating? I know it can gets hot and that's why it has a fan but since I am new with tube amps I want to know what can be considered normal.

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