Need help w/Mark IV amp. What am I doing wrong? - Jemsite
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post #1 of 6 (permalink) Old 02-08-2003, 08:19 PM Thread Starter
 
Join Date: Dec 2000
Location: Irvine, CA
Posts: 649
Need help w/Mark IV amp. What am I doing wrong?

Okay, I just bought a Mesa Mark IV from a fellow jemsiter (thanks Chris!). I basically have the 1X12 short combo but he also included the original head cabinet. I played thru the combo yesterday and it sounded AMAZING! Today, I transferred the guts into the head cabinet, hooked up the reverb & fan, and hooked it up to my Mesa 2X12 recto cab. I turn it on...wait about 2 minutes, switch standby to ON and...nothing. Just a mild hum. I can tell the fan is not running. I then tried to hook up the original combo speaker as well, still nothing. Since this is my first tube amp, I want to check with some experts to see if they can help me troubleshoot the situation. Thanks!
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post #2 of 6 (permalink) Old 02-09-2003, 12:10 AM
 
Join Date: Dec 2000
Location: A Mile High (USA)
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The fan can be a little tricky to hook up in the head cab, since it's such a tight fit. But...even if it's NOT plugged in, the amp should still power up fine. Are all of the tubes powering up visibly? I hadn't swapped the amp back from the combo cab since I got it about a year ago, so I can't really think of anything off the top of my head, but...it should be a fairly simple task. I'm honestly not sure what could be wrong

I guess just make sure all of the tubes are firmly seated in their sockets, etc. If all else fails, give Mesa a call on Monday- they're great to work with and should have you up & running in no time!

Sorry you're having issues though...I hope it works out- you'll LOVE the amp!

Chris
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post #3 of 6 (permalink) Old 02-09-2003, 12:41 AM Thread Starter
 
Join Date: Dec 2000
Location: Irvine, CA
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Chris, thanks for the advice. I noticed the spacing is pretty tight in the head encloure, but nothing that couldn't be worked out. At least I know everything checked out perfectly while the chassis was still housed in the combo cab. I'll tinker with it a bit more to see what else I could have missed. Thanks!
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post #4 of 6 (permalink) Old 02-09-2003, 06:33 PM Thread Starter
 
Join Date: Dec 2000
Location: Irvine, CA
Posts: 649
All taken care of! A preamp tube came loose while sliding the chassis into the cabinet and some styrofoam was lodged in the fan. Everything is top notch. Time to upset the neighbors!
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post #5 of 6 (permalink) Old 02-09-2003, 08:19 PM
 
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Whew! Glad it was something minor!

Now...go rattle some windows!
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post #6 of 6 (permalink) Old 02-10-2003, 04:48 PM
 
Join Date: Dec 2000
Location: Cincinnati, OH USA
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Glad to hear that you got your Mark IV woes sorted out! It's a killer amp... now it's time to enjoy it!

--B
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mesa mark , preamp tube , recto cab , tube amp

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