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Post by greglecompte on Mar 20, 2010 0:48:25 GMT -5
hey if i adjust that variable resistance pot will it cut down the hum on my nitro when the amp is sitting with my noise suppressor cutting the signal to my amp and what would the side effects be of adjusting it?
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Post by Lewis on Mar 20, 2010 7:44:35 GMT -5
Excellent job, thanks for taking the time to put this together!
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Post by splawndude on Mar 20, 2010 10:14:59 GMT -5
^Thanks Lewis hey if i adjust that variable resistance pot will it cut down the hum on my nitro when the amp is sitting with my noise suppressor cutting the signal to my amp and what would the side effects be of adjusting it? Good question. Not sure. I believe the amps ship out with the Hum pot set at 12 noon. I was told by Splawn HQ to just leave it there (50%) so I didn't mess with it to much. My guess is you could dial a bit more hum out - but you would sacrifice tone in doing so. Is your noise suppressor up front to kill guitar noise? Have you tried it in the loop? You can also make sure your guitar is shielded and grounded real well and then either move the NS-2 to the loop or remove it altogether. Unless someone has more/different advice, I'd send Scott an email and ask him - or try it yourself. Good luck. |
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Post by greglecompte on Mar 20, 2010 12:51:26 GMT -5
i have tried the ns-2 in the loop and for some reason it wouldn't work so i dono what is up with it
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Post by splawndude on Mar 20, 2010 14:38:33 GMT -5
Well, can I assume that other pedals you have DO work in the loop? My guess is that the hum you are hearing is coming from your guitar, cables or pedals that are in front of your amp - if that is where your NS-2 is and works. If that is the case, then the hum cancel pot inside the amp won't replace the job of your NS-2. Maybe that was not your question. Another way of saying it is, if the NS-2 doesn't do anything while in the loop then that tells me your amp is as quiet as it can be and the Hum Cancel pot is fine where it is. I say this because I have a MXR SmartGate in my loop but I rarely use it. For times when I do have a lot of unwanted amp noise (like when the gain is cranked) the SmartGate works and does a great job of canceling out noise (with some tone sacrifice - which is why I don't use it). Are all of your guitars nice and quiet going into the amp or do you rely on the NS-2 up front? Again, I'm not a Hum Cancel Pot expert nor an amp tech - but obviously you can always experiment with it on your own if you are comfortable with the safety procedures  PS: I don't think I made mention of it in the Tutorial but the thing that I was very impressed with is that when I play my amp while it is outside of the chassis it is very very quiet. I was plugged in direct too of course but still. |
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Post by splawndude on Apr 12, 2010 20:21:11 GMT -5
Any suggestions for my OP?
anything is welcome.
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Post by Ayton(e) on Apr 13, 2010 10:05:28 GMT -5
Just going to pick up on a couple questions I missed: What ever happened to jesusdriven?He had alot of info on this subject,and he had a how to also. JD first got a virus that messed up his PC, making him unable to visit the forum. Worse than that, though, the persistent power problems at his house drove him to sell his Splawn and buy a little Mesa combo.  |
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Post by Ayton(e) on Apr 13, 2010 10:09:53 GMT -5
Ayton - what blog are you referring to? Once you do that - will I be unable to edit? Just my guitar blog (see signature) and I was only going to provide a link to your post here, so it wouldn't affect you editing or updating etc. I was kinda waiting until it got stickied or posted in the FAQ section, though, any word on that?! |
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Post by splawndude on Apr 14, 2010 13:32:46 GMT -5
Just my guitar blog (see signature) and I was only going to provide a link to your post here, so it wouldn't affect you editing or updating etc. I was kinda waiting until it got stickied or posted in the FAQ section, though, any word on that?! Oh shoot, I thought you meant a FAQ here. Yeah, I don't know how to do that. I can't start a new thread in FAQ. I'll ask Vom again. As far as linking this to your guitar web site thing - thats fine bro |
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Post by splawndude on Jun 15, 2010 11:19:49 GMT -5
bump for a friend
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Post by Shawnee on Jun 27, 2010 8:57:41 GMT -5
OK guys, I got the 2009 QR that Lewis was selling and I just wasn't happy with the tone. I had a 2005 and loved it but wanted the updated clean and the loop volume. This amp just seemed to be lacking in the gain department and wasn't as thick as my 2005. Well I ordered a bias probe (because I hate testing plate voltages on the tiny tube socket pins inside an amp) and guess what I found? My bias was around 19ma! The plate voltage was around 430v (Scott says he sets his amps up to run at 490v). According to my math this amp is running at about 30% dissipation! The normal range is 50-70% so I have some tweaking to do. I will re-check letting the amp warm up longer than 5 minutes but that should really be long enough to get a decent reading. Anyone else find crazy number when they checked the bias? I thought maybe there was something wrong with this bias probe but I checked it against another meter and it is reading correctly. I am going to call Scott Monday and ask a few questions before I bias it but I am hoping that this change will get me "that" tone again.
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Post by sasquatch on Jun 27, 2010 10:56:25 GMT -5
When I replaced the original equipment Tung Sol's with Sino's & biased, my amp was at about 24mA. I didn't check the Tung Sol's prior to removing them, just the Sino's once installed. I'm pretty sure the amp shipped from Splawn this way. I bought it used (an '09) from a guy who only had it for about three weeks before losing his job and having to sell. As tubes age and deteriorate the bias will drift, and usually downward, but 19 seems real low. BTW... I biased my quad of Sino's at an average across the four of just under 32mA. The Sino tubes sounded 10X better right from the start, but that may have had something to do with the hotter bias too.
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Post by splawndude on Jun 28, 2010 12:27:35 GMT -5
In the span of of about 8 months my amp drifted from 28 to 22. Then I biased it up to 32 and KABOOM. It was like a new amp. Side note: This tutorial is now in the FAQ thanks to VomHalen |
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Post by Shawnee on Jun 28, 2010 20:58:33 GMT -5
I checked my tubes again and three out of four read within 1ma but the last one reads about 5ma low. I decided to pull the two outside tubes and just bias for half power. I got it from 20ma to 32ma but believe it or not, it still doesn't sound good. Not much gain at all. I may have to send it in for Scott to take a lot at. I KNOW Splawn's sound better than this. My old 2005 QR ROCKED. I hear that the 2006-2009's don't have quite as much gain as the older ones (or the 2010's) but this is just not right.
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Post by splawndude on Jun 28, 2010 22:20:45 GMT -5
well, if you play mostly metal - a colder bias is actually better.
also, make absolutely sure your preamp tubes are good. I have Mullard power tubes and JJ preamps and I have more gain than can use and play some pretty heavy stuff. I have an '08 running at half power. Did you cut your ohms in half too?
PS: Up to about 5mA difference is actually OK. Not ideal but not necessarily dangerous.
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