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Unread 11-12-2007, 10:32 AM   #1 (permalink)
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Avt 275

Just purchased the AVT275. A very impressive unit but I have one small but important question: If anything was damaged (for example in transit) is there any way I could find out without opening the unit. The single tube/valve, would it be obvious if this was cracked or broken in terms of sound. Im sorry if this sounds like a naive question but I'm new to amps. Thanks for your help.
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Unread 11-13-2007, 03:14 AM   #2 (permalink)
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Re: Avt 275

Well, you've only got 1 tube, so if its got issues, you'll know. Its in your preamp stage, so if you have the gain up, you'll get nasty squeeling or humming even if there no instrument plugged in. If its broken completely, I don't think much will happen when you plug in at all except hum.

The preamp tube is simple to replace, and is a super cheap fix. Enjoy the AVT! They are quite nice.
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Unread 11-15-2007, 04:55 AM   #3 (permalink)
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Re: Avt 275

Thanks for that Loki. It's probably ok then on that front. I was just concerned because the delivery guys had the (boxed) amp on its side when the opened the delivery van. Sometimes you just can't tell if things have been rough-handled prior to delivery. It seems to be working without a hitch. I noticed though that when the amp heats up (after a few minutes) humming kicks in - sounds like the cooling fan. It's actually quite loud when playing in a quiet environment; is this normal with the AVTs?
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Unread 11-15-2007, 07:31 AM   #4 (permalink)
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Re: Avt 275

They are pretty tough
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Unread 11-15-2007, 07:47 AM   #5 (permalink)
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Re: Avt 275

Yes, but is the humming usual in the AVTs? It's very noticable in a quiet environment. If so, is there any way to reduce it?
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Unread 11-15-2007, 08:02 AM   #6 (permalink)
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Re: Avt 275

They do have a cooling fan inside... like a PC fan. You can probably replace it with a noiseless fan.

Like all fans in PC's the bearings get shot, or if it gets nudged they start to howl. If you open it up and tap on the center of the fan while its spinning you might be able to eliminate the noise... not a permanent fix, but at least it will tell you if thats the problem. Tapping the center sometimes aligns the bearings and lets the fan spin properly.. if its silent then, you need a new fan.
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Unread 11-15-2007, 08:04 AM   #7 (permalink)
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Re: Avt 275

I did a quick google search and it turns out its a common problem with AVT's.

There are some replacement fans out there.

Marshall Amplifier Cooling Fan 40mmx40mmx10mm 24V:Catalina Guitars

any 110VAC fan with the same dimensions should work, and a good PC store should be able to recommend a silent one.
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Unread 11-15-2007, 11:10 AM   #8 (permalink)
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Re: Avt 275

Loki, thanks for that. What sites did you check regarding the problem? Maybe it's a problem exclusive to AVTs? I definitely need to sort it before it does my head in! Either do that or keep playing till I drop! :-)
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Unread 11-16-2007, 01:22 AM   #9 (permalink)
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Re: Avt 275

I'd say keep playing! But if the fan has a problem, you should get it sorted out soon... if the pc board gets too hot in there it could fry. Is it still under warranty? I know its a pain, but at least it would get fixed for you.

I just googled "Marshall AVT fan noise".
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Unread 11-16-2007, 07:35 AM   #10 (permalink)
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Re: Avt 275

Yes, I just got it a week ago. It's covered for 1 year. I'll do a few ground-wire checks and a bit more research and see if the problem lies elsewhere. Otherwise it's going back.
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Unread 11-16-2007, 10:08 AM   #11 (permalink)
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Re: Avt 275

Just one other question; actually, it's more of an opinion: Does anyone have experience of using both the AVT50 and AVT275 and how do they compare against each other? One link I came across on the web suggested the AVT50 was superior (ie. closer to the "authentic" marshall tone). Maybe that's because not many people practising at home have the opportunity to crank up the 275 to get the best juice out of it - apparently it only really shines at high volume.
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Unread 11-16-2007, 11:06 AM   #12 (permalink)
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Re: Avt 275

I had the 150H and its true, the louder you can go, the better.

I think the 275 has a few more features than the 50... like the acoustic simulator *which sounds great* and a few other things that may be worth considering.

275watts is a LOT of power... hell 50 watts is a lot of power. There is a 5 watt Class A BadCat Mini Cat 2 at my friends shop and its SCREAMING loud... and its only 5 watts...

Its all relative I guess. Do you play with a band ever, or jam with anybody? You might want that extra power if you're playing over drums...
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Unread 11-16-2007, 12:27 PM   #13 (permalink)
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Re: Avt 275

I'm not gigging at the moment; just some church/folk-group stuff once a month (and that's with keyboards). I'm working towards doing backing work on guitar but I think the 50x would be more than adequate for small gigs. As a mattter of fact, the 275x really got a slating on harmony-central.com; It got completely blasted out of the water! The 50x came off lightly in comparison though there was only one review on that; apparently, it closer to the authentic marshall tone. Well, I'll talk to the guy in the music shop and see if he'll trade down or (if not) maybe push the boat out a little further and buy a small all-valve amp. [Just hope the taxi driver doesn't remember his cabs rear suspension-springs were screwed getting this tank back to the music shop!! Better flag him down when I'm on the main road] :-)
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Unread 11-16-2007, 05:31 PM   #14 (permalink)
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Re: Avt 275

They are heavy aren't they? The thing I hate most about combos is the weight. I just picked up another Mark IV and its soo damn heavy.

There is a Peavey Triple XXX 2x12 combo that weighs 180lbs easy... Scary!
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Unread 11-20-2007, 09:09 AM   #15 (permalink)
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Smile Re: Avt 275

Well thank God I got to return the AVT275x in exchange for the AVT50x. The 50 is just perfect for my needs and it's portable; anyone who says it's heavy hasn't tried to lift the 275! As regards in-built (digital) effects I'd rather build up a stomp-box collection over the years; that way when/if I sell to upgrade I still have my favourite pedals; makes perfect sense. Yes, I strongly recommend the 50; it's got a lovely tone despite the fact that distortion and reverb aren't that hot; but like I said that can be cured with a few top-notch footpedals and I just wanted to pay for a quality amp with great tone at a decent price. I'd recommend the 50 as a MIDWAY amp between gigging in medium sized venues/studio practice - (this amp can be seriously loud) - and major events (such as open-air gigs). If you're at the latter stage of your musical profession then it makes sense to consider something like the TSL100 or something along those lines. And the other thing I noticed about the AVT50x is there's no sound from the fan; don't know if that's the same on every single model but I was really pleasantly surprised after hearing the fan on the 275. In conclusion, a great "little" amp for the money!
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Unread 11-23-2007, 04:48 PM   #16 (permalink)
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Re: Avt 275

I love my AVT50, i put in a Celestion Heritiage G12M 70 the difference
in power was automatic. They are pretty darn loud and will
drive a 4 12 cab with no problem
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Unread 09-22-2012, 06:05 PM   #17 (permalink)
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Re: Avt 275

[QUOTE=LoKi;2162]

275watts is a LOT of power... hell 50 watts is a lot of power. There is a 5 watt Class A BadCat Mini Cat 2 at my friends shop and its SCREAMING loud... and its only 5 watts...
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Unread 09-22-2012, 06:06 PM   #18 (permalink)
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Re: Avt 275

it's 150watts across 2x75watt speakers, that's where the 275 comes from...still alot tho'!!!
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Unread 09-22-2012, 06:53 PM   #19 (permalink)
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Re: Avt 275

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Last edited by crossroadsnyc; 09-22-2012 at 07:24 PM.
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Unread 01-07-2013, 07:58 PM   #20 (permalink)
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Avt275

I just ordered an AVT275, should be in tomorrow. Does anyone have any tips for the amp? OR things that i should be aware of?
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Unread 01-07-2013, 09:09 PM   #21 (permalink)
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Re: Avt 275

I have two Marshall AVT amps. The first one I purchased is the AVT 150 combo, and the second is the AVT 20 combo.

With the AVT 150 I usually prefer to run pedals through the clean channel instead of the on board OD1 and OD2 channels.

They really are great sounding amps, and the 150 and 275 are basically the same except the 275 is a stereo amp.

The onboard effects are really decent.

I like to run a Boss Metal core into the front of the amp through the clean channel, and run with the chorus on and up pretty high.

The AVT 20 has amazing clean tone, and with the reverb sounds just awesome. The clean on the 150 is not bad either, it just doesn't have reverb to make it pop. The acoustic channel is okay, but I find I don't use it a lot. That's probably has more to do with my taste in tone vs any issues with the way it sounds.

Some really good deals can be found on the AVT amps. I got the AVT 20 for 90.00 dollars US on Craig list. I've seen the 150 heads on eBay for 250.00.

Don't be afraid to change out that preamp tube until you find one that makes it sing.

The cooling fans do crap out occasionally, and are easily replaced. You can find them on ebay for cheap. I'll be needing my second new fan soon. They are just cheap computer like fans, and just don't last for a long time. The 150 actually has two fans so I don't know if the replacement is going out, or if it's the original second fan that I never had to change before.

They are easy to get to and replace.

The tone controls in combination with your guitars tone control will give you tone options, so play around with it. Don't let all the knobs fool you. It's an easy amp to dial in.

With my Gibsons running 490s I tend to tone them down, so their not so bright. With the AVT 150 I have my bass middle and treble set as follows. 7 - 12 - 5 o’clock.


Hope this helps. Enjoy that beast.
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Unread 11-17-2013, 07:54 AM   #22 (permalink)
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Re: Avt 275

Quote:
Originally Posted by Mark View Post
Yes, but is the humming usual in the AVTs? It's very noticable in a quiet environment. If so, is there any way to reduce it?
you can order 2 new fans from marsall uk its £15 including postage in the uk
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