Huw10

My tech hasn't answered my texts for weeks. Going to call him today. Thanks for all the help. Just as an aside, my mesa is actually variable bias. The guy before me, or possibly before him replaced the fixed bias circuit. It was biased ridiculously low, so I thought that would be the end of all my problems, but apparently not!

[quote name='Mr. Foxen' post='959836' date='Sep 17 2010, 07:43 PM']Whacking the tubes only tells you that whacking the tubes makes noise. Tubes can do that, they are only dead from microphonic if they are howling or something, or you are in the habit of whacking your tubes whilst playing. Also, running it with missing tubes without knowing the pairings and not adjusting the impedance appropriately is very bad.[/quote] I'm aware that I don't know a lot about amps, this is why I am posting and seeking advice. I do know that the tubes remaining in the amp are paired. I haven't adjusted the impedence, but it was a simple test to see if it was the bad tubes blowing the fuse or another problem.

[quote name='umph' post='959435' date='Sep 17 2010, 01:47 PM']did you use the correct value of fuse? The new valves may have been pulling far to much current and taken the fuse.[/quote] Yeah, according to the back of the amp. 3.15A Right a little update. I've opened the bastard up. I had a wee tap on all the tubes and most of them seemed pretty wacked, but I took the two worst ones out and switched it on. Fuse blows, but it comes on. Progress. So I figured the four new tubes my tech put in should be working fine. I pulled out the 8 old ones and left the four new ones. I switch it on and HUZZAH! It's working, BUT after about 5 mins one of the 4 tubes is glowing super hot, so I switch it off. I figure that tube is prolly pretty much dead now. Any reason why this could happen? I noticed that the tube directly to the right of it of it was not quite in the socket, could this be why? Also, say this is the lay out of the tubes in the amp: t t t t t t t t t t t t t t t t how do the pairs work - like this? 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 or like this? 7 5 3 1 1 3 5 7 8 6 4 2 2 4 6 8 Thanks again!

I've had my Mesa for over a year now and had it serviced around 3 months ago: 4 new valves, rebias etc. At practice a few nights ago I switched it on a played about with it for around 4-5 minutes (first time in about 4 weeks - holidays!) and then it kind of just peetered out. The LED had gone out so I switched everything off. I figured it was just a fuse had blown so i replaced it and tried to switch it on to no avail. There was a kind of burning sort of smell and a lot of heat coming off the 4 new tubes. I checked the old fuse and although it looked in a bad way it didn't look like it had been blown. My tech lives about a 3.5 - 4 hour round trip away so I was just looking to get some advice before I take it down there. I have a horrible feeling that it might be some sort of transformer issue. If anybody has any sort of advice they could lend it would be MUCH appreciated! Thanks in advance for any help.

[quote name='Musicman20' post='560540' date='Aug 4 2009, 07:26 PM']I've noticed a lot of Ampeg stuff going really cheap. Me thinks troubled waters lie ahead.[/quote] aye, your not wrong. an svt CL for just over a grand new?! I'm reletively sure thats totally ridic?! [url="http://www.thomann.de/gb/news_msg_ampeg_amp_attacke.html"]http://www.thomann.de/gb/news_msg_ampeg_amp_attacke.html[/url]

I used to tune down to CGCF as well and suffered from this. Is there a similar set for a drop D tension as I find it gets pretty woolly and overpowering on the bottom string too.

[quote name='Huw10' post='560196' date='Aug 4 2009, 02:00 PM'][url="http://www.thomann.de/gb/ampeg_svt_610_hlf.htm"]http://www.thomann.de/gb/ampeg_svt_610_hlf.htm[/url][/quote] Aye I did it a couple of weeks back. Just thought to post it on here to share the love y'know. Tis a REALLY good price!

[url="http://www.thomann.de/gb/ampeg_svt_610_hlf.htm"]http://www.thomann.de/gb/ampeg_svt_610_hlf.htm[/url]