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Post subject: Fender amps and chassis hum+vibration
Posted: Fri Aug 22, 2014 7:03 pm
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Aspiring Musician
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Those of you that have a 65 DRRI and/or a 68 CDR, does your amp have a light vibration that you can feel on the cabinet?
Also, if you put your ear down by the chassis and listen close, do you hear a hum that is directly related to that vibration?

Both CDR's that I've had do this.
The HR DLX3 did not.
I'm now wondering if certain Fender amps have an inherent light vibration and chassis component hum?

My thinking is that this is not normal and that I just happened to get 2 amps with transformer problems, if that is what is causing the hum.


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Post subject: Re: Fender amps and chassis hum+vibration
Posted: Fri Aug 22, 2014 10:06 pm
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Rverb wrote:
...an inherent light vibration and chassis component hum?...


Maybe you're over-thinking it? My DRRI has a light vibration on the right side of the cab on top (near the power transformer), as would nearly any amp with a transformer powering nine tubes. However, I don't have any hum, and only the slightest hiss with the volume maxed.

Any hum from the amp (with no guitar plugged in) might be tube related, or even capacitor related. Any hum with a guitar plugged in and the guitar volume up could be from normal single-coil noise.

How many threads do you need about one amp?

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Post subject: Re: Fender amps and chassis hum+vibration
Posted: Sat Aug 23, 2014 1:49 am
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shimmilou wrote:
Rverb wrote:


How many threads do you need about one amp?



:lol:


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Post subject: Re: Fender amps and chassis hum+vibration
Posted: Sat Aug 23, 2014 7:32 pm
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Aspiring Musician
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shimmilou wrote:
Rverb wrote:
...an inherent light vibration and chassis component hum?...


Maybe you're over-thinking it? My DRRI has a light vibration on the right side of the cab on top (near the power transformer), as would nearly any amp with a transformer powering nine tubes. However, I don't have any hum, and only the slightest hiss with the volume maxed.

Any hum from the amp (with no guitar plugged in) might be tube related, or even capacitor related. Any hum with a guitar plugged in and the guitar volume up could be from normal single-coil noise.

How many threads do you need about one amp?


About as many as it takes when new things come up, and new questions come up.
Look at the sheer number of threads, and then look at how many amps Fender makes.
:)
Should there be only one thread per amp?

Over thinking it?
There is a vibration felt through the cabinet on the left and right of the top, same vibration on the left and right sides.
Listening closely with my ear down by chassis there is a hum, and it's likely the transformer. Nothing over thought about that, cause it's there.

The only other Fender amp I've owned is the HR and that amp had no vibration of any kind.
None of the other tube amps I've had have had this vibration either.
My Egnater Vengeance has 11 tubes in it and there is not even a hint of vibration.

If this vibration is inherent in Fender amp design, then that's good to know.
But to suggest that this vibration is normal in any tube amp, well that's just not true at all.


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Post subject: Re: Fender amps and chassis hum+vibration
Posted: Sat Aug 23, 2014 8:24 pm
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Kinda sounds like a noisy tranny. Power or Output. Get a wooden stick about 1/2-inch in diameter. With amp on, place it on the trannies and listen to the other end. You maybe able to locate which one is the source.


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Post subject: Re: Fender amps and chassis hum+vibration
Posted: Sat Aug 23, 2014 9:58 pm
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Rverb wrote:
...to suggest that this vibration is normal in any tube amp, well that's just not true at all.


Absolutely true, transformers do have some vibration, you might not notice it but it's there. If you listen with the makeshift stethoscope as BMW2002Ti suggests, you'll hear it in every power tranny.

As far as number of threads, you've asked about every little thing with a new thread for each, most of them normal (heat, vibration, on and on). And no, not everyone starts a new thread for each thought about the same amp, one is plenty.

You don't even have any of the amps that you've mentioned anymore, correct?

_________________
---> "The amp should be SWITCHED OFF AND UNPLUGGED before you do this!" <---

Por favor, disculpe mi español, no se llega a la práctica con mucha frecuencia.


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