Amp hum normal?

Orange Amps Technical Q&A's

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Jayco
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Post by Jayco » Mon Oct 24, 2005 10:02 pm

Hey guys...

I've been enjoying my new AD30HTC and PPC2x12, but there is one thing that I'm not sure is 'normal'...

When you take the amp of standby, the amp hums... pretty noticeably.

I'm running at low volumes (around the first hash mark), which is PLENTY loud for practicing/recording in a smaller area, but the hum is so loud that its annoying.

If I turn the amp up, the hum does not increase with the volume of the amp, so I am assuming its not a tube problem.

Any ideas? or is this just how they sound when they are 'on'? My AC-15 doesn't have this same sort of 'powered up' sound.

Thanks,
Jim

fiveightandten
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Post by fiveightandten » Mon Oct 24, 2005 10:05 pm

You may have a bad power tube or a grounding issue in the power amp. It's tough to say without hearing it. All tube amps hum, some more than others. But if it's annoyingly loud, regardless of gain and volume settings, that isn't right.

-Nick
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'71 GRO100 || '96 OR-80 || AD30 || '64 AC-50 || AC-30TBX || Hiwatt DR504 || HI-TONE HT30
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irish_admiral
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Post by irish_admiral » Mon Oct 24, 2005 10:52 pm

What sort of guitar do you play? My AD30 hums a very little with my Tele, but is silent with humbuckers.

You're not getting stuck in some sort of ground loop, or have plugged into a circuit with lights or dimmers on it?

Incidentally, if you haven't had the chance to, do open up that volume dial when you can. Sounds an awful lot better!
Joe

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Orange AD15, Matamp 1224, Fender 'JD' Tele, G&L ASAT, Duesenberg Starplayer TV, Eggle Kanuga, Avalon D25, Warwick FNA Jazzman, Eden Nemesis / Bergantino EX112S, Eastman MD305 & other stuff...

VintageJon
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Post by VintageJon » Tue Oct 25, 2005 2:52 am

Does it hum with no guitar plugged in?

(VERY IMPORTANT QUESTION!)

awaiting response...
-Jon

Jayco
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Post by Jayco » Tue Oct 25, 2005 6:25 am

It has nothing to do with the guitar... as it does indeed hum without a guitar plugged in.

Its not a typical "single coil" type hum... its a low "pitched" hum.

It does get a little louder as I turn things up... I was just testing it right now.

There are no dimmers on the circuit that it is plugged into.
Jim

Meole
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Post by Meole » Tue Oct 25, 2005 1:02 pm

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Jayco</i>
<br />

There are no dimmers on the circuit that it is plugged into.
Jim

<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

Any fluorescent lamps?

Jayco
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Post by Jayco » Tue Oct 25, 2005 4:39 pm

Nope.

Jim

fiveightandten
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Post by fiveightandten » Tue Oct 25, 2005 4:51 pm

Sounds like there's a bad ground conection somewhere. There's so many spade connectors in that amp it's pretty possible one of them isn't making good contact.

Its also plausible that there's a bad filter cap in the power supply, but probably not.

Have it looked at...your amp is under warantee, mind as well use it.

-Nick
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'71 GRO100 || '96 OR-80 || AD30 || '64 AC-50 || AC-30TBX || Hiwatt DR504 || HI-TONE HT30
LP Standard || LP Studio || LP Custom Lite || Ric 620 || Ric 360 || MIA Tele || SG 61 RI

irish_admiral
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Post by irish_admiral » Tue Oct 25, 2005 6:47 pm

Possibly a spade connector, but we've never come across an AD30 spade problem here I think (guys?)... I usually associate a buzz with bad grounds rather than low hum. Maybe.

Have you tried it out in different places, and also tried swapping the preamp valves?
Joe

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Orange AD15, Matamp 1224, Fender 'JD' Tele, G&L ASAT, Duesenberg Starplayer TV, Eggle Kanuga, Avalon D25, Warwick FNA Jazzman, Eden Nemesis / Bergantino EX112S, Eastman MD305 & other stuff...

Jayco
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Post by Jayco » Tue Oct 25, 2005 10:19 pm

I have not tried swapping any tubes as of yet... I wasn't sure if it was 'notmal'. I've determined however in listening to some of the clips on the 'official sound clip' thread, that the noise isn't present on other's recordings of the same amp.

Its definitely not a buzz... its a low hum.. pitched to a particular note even.

It makes this hum even with gain and master volumes set to nothing and no guitar plugged in... would that alleviate it being a preamp tube?

I could probably post and example of the sound if it would help.

Jim

irish_admiral
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Post by irish_admiral » Tue Oct 25, 2005 10:30 pm

No, I can imagine it. I'm slightly concerned that it might be something a little nastier. If it's under guarantee, back to the shop with it to let them poke at it, that way you're not liable if anything goes wrong. Just ask for a direct replacement immediately as you have a gig coming up...

Incidentally - probably a silly question, but i'll ask anyway - you are using correct speaker cable to plug it into the cab, rather than a guitar cable aren't you?
Joe

G(sus) saves

Orange AD15, Matamp 1224, Fender 'JD' Tele, G&L ASAT, Duesenberg Starplayer TV, Eggle Kanuga, Avalon D25, Warwick FNA Jazzman, Eden Nemesis / Bergantino EX112S, Eastman MD305 & other stuff...

Jayco
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Post by Jayco » Tue Oct 25, 2005 10:35 pm

Yep.. using an actual speaker cable... and a high quality, short one (under 3 feet) at that.

16 ohm cabinet... plugged into the 16 ohm jack.

Its definitely under warranty... I bought it on October 7th (3 weeks ago).

Jim

bgarrett_uk
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Post by bgarrett_uk » Wed Oct 26, 2005 2:05 am

<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Jayco</i>
<br />I have not tried swapping any tubes as of yet... I wasn't sure if it was 'notmal'. I've determined however in listening to some of the clips on the 'official sound clip' thread, that the noise isn't present on other's recordings of the same amp.

Its definitely not a buzz... its a low hum.. pitched to a particular note even.

It makes this hum even with gain and master volumes set to nothing and no guitar plugged in... would that alleviate it being a preamp tube?

I could probably post and example of the sound if it would help.

Jim

<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

Does the hum come from just the amp? Or is it coming through the speaker? The primary mains transformers can hum a little - or it may need tightening up a bit. ... maybe....

Cheers
Brian

Jayco
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Post by Jayco » Wed Oct 26, 2005 2:22 am

Its through the speakers unfortunately... turns on and off with the standby switch.

Jim

VintageJon
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Post by VintageJon » Wed Oct 26, 2005 3:59 am

Jim, OK this is really begining to sound like a filter cap problem!

As it's Under Warranty, return for Warranty Service. Do it now!

-Jon

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