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Post subject: Plugging in my cab to Fender combo amp?
Posted: Fri Jan 10, 2014 10:07 am
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Hey there, recently purchased a Fender Hot Rod Deluxe III amp. I've had this 2x12 custom made cab with 2 Celestion Vintage 30's in it that I believe to be 8Ohms as is my hot rod deluxe. The stock speaker sounds great but I get this rattle when the amp is turned up past 3 or so. I would love to try this with my closed back cab, that said. There are 2 speaker jacks in the back of the amp, do I unplug the internal speaker and plug the cab into that jack or just use the "ext speaker" jack next to it? Thanks in advance.


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Post subject: Re: Plugging in my cab to Fender combo amp?
Posted: Fri Jan 10, 2014 10:41 am
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Swampfox wrote:
The stock speaker sounds great but I get this rattle when the amp is turned up past 3 or so.


Inspect your amp cabinet and look for any loose screws holding the internal speaker to the baffle board. Tighten any if found. If the rattle persists you may have a defective speaker.

You must determine the extension cabinet's total system impedance. If it's 8 ohms you can safely use it in conjunction with the amp's internal speaker. If it's 4 ohms you must disconnect the internal speaker, insert a dummy (open) plug into the primary speaker jack, then connect the external cabinet to the extension speaker jack.

Arjay

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Post subject: Re: Plugging in my cab to Fender combo amp?
Posted: Fri Jan 10, 2014 10:46 am
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Awesome great answer thanks for the quick response.


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Post subject: Re: Plugging in my cab to Fender combo amp?
Posted: Fri Jan 10, 2014 10:52 am
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You're welcome, sir.

Arjay

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Post subject: Re: Plugging in my cab to Fender combo amp?
Posted: Fri Jan 10, 2014 2:24 pm
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Sure that's not tube rattle?

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Post subject: Re: Plugging in my cab to Fender combo amp?
Posted: Fri Jan 10, 2014 4:58 pm
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Retroverbial wrote:
..............You must determine the extension cabinet's total system impedance. If it's 8 ohms you can safely use it in conjunction with the amp's internal speaker. If it's 4 ohms you must disconnect the internal speaker, insert a dummy (open) plug into the primary speaker jack, then connect the external cabinet to the extension speaker jack.

Arjay

One of the easiest ways to check the cab's overall impedance (if it's not written on the cab) is to check the cab's DC resistance with a simple ohm meter. DC resistance is the largest component of the impedance and is on-the-order of 75%, so for an 8 ohm speaker it should measure around 6 ohms +/-; a 4 ohm cab will measure just under 3 ohms. Plug a speaker cable into the cab and check the resistance on the open end barrel to tip.

Based on the measurement, follow Arjay's advice.

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Post subject: Re: Plugging in my cab to Fender combo amp?
Posted: Fri Jan 10, 2014 8:56 pm
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I'm actually quite positive its the tube rattle. Would using an external cabinet only (if possible) eliminate the rattle? or is it something i'm going to have to deal with. As for checking the rating on the cab that's something I'll do tomorrow.
Thanks everyone. what a helpful forum..


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Post subject: Re: Plugging in my cab to Fender combo amp?
Posted: Fri Jan 10, 2014 10:05 pm
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Swampfox wrote:
I'm actually quite positive its the tube rattle. Would using an external cabinet only (if possible) eliminate the rattle? or is it something i'm going to have to deal with. As for checking the rating on the cab that's something I'll do tomorrow.
Thanks everyone. what a helpful forum..

Maybe, but not for sure. Combos are far more prone to rattle than heads due to the proximity of the speaker. Tap the tube lightly with a pencil eraser to check for and determine which tube rattles.
Often corrected by: http://www.ebay.com/sch/i.html?_from=R4 ... rs&_fscr=1
http://www.eurotubes.com/eurotubes-Euro ... -Rings.htm

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Post subject: Re: Plugging in my cab to Fender combo amp?
Posted: Mon Jan 13, 2014 7:23 am
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If you only run an extension cabinet the rattle should be gone unless you set your amp directly on the cabinet.

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