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Discussion in 'Amps and Cabs [BG]' started by Mo Boogs, Mar 13, 2017.
The V4B is a pretty easy carry once you're used to hauling an SVT.
UPDATE: Day 2 of jammin on my new V-4B I've noticed 12 seconds of hum every minute or so. Called up sweetwater to see if I had some thing set wrong or bad connection. BTW I got a great deal on this amp. It was a demo model so I got a buck thirty+'off. Well sweetwater thinks it may be a bad tube and are sending me a brandy-new one - not another demo, no charge, no questions ask. Whatta company!
Glad SW is going to get it sorted but by chance you have a cell phone, computer/bluetooth, or wifi router anywhere near the amp? Certainly could be a tube. Could also be some room interference. Cell phones tend to be more a ticking noise when it happens and wifi signal would be more constant, but things to think about.
No I didn't but that's good to know about wifi. What I was hearing was 60 cycle hum. I'm used to that sound with the older amps I've owned. Usually it's a bad cap or something.
You got that right! I consider it a micro-tube amp.
Yeah, you can't haul a V4B around, you need a sammich...
Here you go.
Yea I arrive 2 hours early to a gig to set up along with the drummer and keyboard player. The guitar player strolls in 15 mins before we go on after telling me he will arrive early to set up.
So Sweetwater wants me to send a video of my amp doing that hum for 12 seconds cycle. Last night I plugged the amp in, same receptacle as last week and it didn't do the hum at all. I tried it in my basement and got a constant hum. What's up with that? Are these amps really that sensitive to interference? Last week when I tried it, I had plugged the amp into both my grounded kitchen receptacle and ungrounded living room receptacle and it was doing the 12 hum cycle regardless of grounded or ungrounded power source. I don't get it. Is the amp faulty?
I haven't had that same experience with my V4B at all, so no, I don't think they are particularly sensitive to interference. The only hum that I get from my amp is the usual 60 cycle hum i get from having mixed volumes on my jazz bass. If the volumes of both PU's are up all they way, hum goes away.
If the hum is constant, my guess would be faulty tube or cables.
Have you tried switching cables? Making sure you have a decent speaker cable?
Sorry to hear you're having issues right away. This was supposed to be a happy time...
Hang on a sec... if you're using an UNGROUNDED outlet... isn't that just asking for trouble?
In my (limited) tube amp experience, they were all much more hum and noise sensitive, as well as spewing out MUCH more electro/magnetical pollution in the surroundings.
While I have zero audible hum at home (grounded outlet) through my (SS) LMII or EBS 1V2, I get some slight hum through my (tube pre) Fender TBP-1, and lots of hum with Peavey VB2 or Traynor YBA300 all tube heads. All units in new or as new condition.
Please note that we have 230V/50Hz, which I speculate MIGHT be a disadvantage for US gear built mainly for the domestic market.
Ampeg SVT also seems to hum more than my amps when I encounter them as rented backline.
Yeah... why would anyone be doing that?
Do you get the hum with nothing plugged in or only with a bass? If only with a bass does it change if you alter your orientation in the room or location in relation to the amp (distance or direction)? Trying to rule out sources of induced hum. Agree with the above it could just be a tube issue if this is still the original amp. Wasn't clear if you had sent it back already or if they wanted the video before you sent it back.
Yeah a tech at sweetwater wanted a video first before they do anything. Turns out it's the ungrouded outlets causing that hum. My house was built in 1960 and only half the house was rewired to have grounded outlets. The dumbbell who lived here before me installed GFCI outlets ungrounded throughout the rest of the house so that's why I'm able to plug in the amp but also why it hums. It's not a big deal to me. This won't be my gig spot. I've had tube amps that buzzed less, that's why I was concerned.
So that's bad, good news right?
Did you get to rock the amp without some buzz to make a call on it?
Yes. It's sounds great on both the grounded and ungrounded outlets now. Just little solid buzz on ungrounded but what the heck. Smokin amp. Can't wait to gig with it.
I bought a V-4b ressiue used. At the store it sounded fine, but when I got it home in a quiet environment, I hear a bunch of noise.
There are 3 types of noise. All of them happen even if no bass or instrument cable is plugged in.
1. 60 cycle hum. This happens even with Gain and Master all the way down, but gets a little louder when the Gain is cranked way up.
2. Hiss. This is a steady white noise, and goes silent if I turn the master all the way down.
3. Crackle. In addition to the steady hiss, you can hear an intermittent crackle that goes in and out. This also stops if I turn the master all the way down. This also seems to go away sometimes, maybe after it warms up.
I am also trying to attach a sound clip here for reference.
Should I expect a certain level of noise with this amp, or are these things that can generally be fixed? I mean, I am used to hearing noise from solid state amps, and tube amps I can expect to be somewhat more noisy, but this seems much louder.
In a rehearsal/gig environment it is fine, I don't notice it. But at home, sitting right in front of it in a quiet environment, it is very annoying. Also, I want to use this for recording and don't want that much noise coming through.
I could return this, or have it worked on, but maybe not worth the hassle if all of them are going to have this. So trying to figure out if this is normal/expected.
The noise level in you clip is not normal for this amp.
There are a number of possibilities. The two most common are a bad tube or bad wiring at home. If other amps at home do not make a noise like this chances are it is a tube. You can check that all the tubes are fully seated in their sockets. Pull each one out and reinsert it, one at a time.
Thanks. I tried reseating all the tubes but no effect. Are you referring to the intermittent crackling sound? I would definitely expect that one to be abnormal. But it does seem to go away sometimes. The steady hum and hiss - I am not sure if those are to be expected.
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