Pa audio 10
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Pair Eminence KAPPA Pro-10a 10 Inch Pro Woofer Midrange 8 Ohm 500 W RMS Speaker
I recently reviewed the TubePre , a tube-based pre amplifier module from Audiodigit. I was suitably impressed with what that did when connected to the 'right' amplifier, 'right' being typically a chip amp, or one of the 12 volt class-T amps. As you can see from the picture, it also differs from the Audiodigit pre in terms of its size, as well as working as a headphone amplifier.
There are two pairs of input RCA sockets. The PA comes in a standard version and in an 'SE' version. I was sent the 'SE' version for this review but I also reviewed it using the valve that is supplied with the standard version.
Apart from the valve, the only other change to the 'SE' is the upgrading of the output capacitors. I'll start by describing the performance when using the 6N11 valve, i. For a tube pre amp, the PA is minute! Measuring just 75mm x mm x 45mm, it is able to achieve such as compact size by using an external wall-wart power supply, although that is very small too. The power supply for the PA is 24 volts and you could substitute a pair of 24 volt batteries, or another 24v supply of your choice.
The bundled PSU works well enough though and is claimed to offer "extra low ripple and noise". I like external power supplies because they do make it easy to upgrade if you want to. To achieve such a small case, it was necessary to have the miniature valve protrude through the lid of the case, but hey, isn't that what these things are for, showing them off? As with their other products, the internals are neatly laid out, and they need to be with so much crammed into such a small space!
One obvious advantage of such a compact product is that the signal path is kept about as short as it possibly can be. The case is aluminium and offers excellent shielding against the dreaded RFI, keeping the PA free of unwanted noise.
So what's inside this little box of tricks? It's really not difficult for anybody to swap valves if they so wish. Four screws release the lid of the case, then the valve can be swapped over easily, and if necessary the jumpers can be changed.
The DC bias will probably need adjusting for optimum performance so the tools required would be a Philips screwdriver, a pair of needle-nosed pliers, a tiny flat screwdriver to adjust the blue trimmers , and a multimeter for setting the DC bias accurately. By the way, the PA is not purely a valve circuit! Also in the picture you can see the power switch, and the input selector switch on the rear of the case. Adjusting the bias is quite straight-forward! You remove the lid of the case by removing the four screws that connect it to the front and rear panels.
You place the red probe of your multimeter on one of these vias and the black probe on one of the phono sockets outer part. Set your meter to the 20 volt setting and turn it on. You want to aim for a reading of Please don't be put off by this, it only takes a minute or two and is far easier to do than explain. Trends Audio supply full and clear instructions in the form of a PDF document. I set the volume control on the PA to max, and relied on the volume control in the MJ amplifier.
The results were very similar to using the TubePre, ie the performance of the MJ amplifier was quite transformed from a rather 'grey' and lack-lustre presentation to something that was most enjoyable to listen to. There is no sign of hum nor hiss with the PA, and I didn't find it too 'warm' sounding. Clarity was good, timing spot on, sound stage was large and imaging accurate. I set up the system so that I could use both the PA and TubePre and select one of them using the input selector on the MJ amplifier.
I have to confess that in a blind listening test, I wouldn't be able to pick between these two tube pre-amps! And in a way, that's a compliment to the PA that had the signal passing through its pot, while I had replaced the pot in the TubePre with a simple voltage divider. Being a module, the TubePre would probably be easier to integrate into one of your own projects, for instance adding a tube stage to a DIY power amp, but the PA takes up less space if you want a stand-alone tube pre amp.
Both sound really good and it is really down to the 'packaging' and price as to which one is the better buy. Also remember that the PA has a headphone out facility too but I have to report that the sound quality through the headphones is not nearly as good as it is through a power amplifier!
I certainly wouldn't be able to recommend it as a dedicated headphone amp so you should look at it as a good tube pre amp with a headphone out facility one that drives even high-impedance headphones! The best that I could do was to try the PA with the Charlize and Audiodigit class-T amps, both of which made a very nice sound when used like that. So, how about the 'SE' version? As I wrote above, the 'SE' comes with a 'better' valve, a 6H23n which I installed in place of the 6N11, and with upgraded output capacitors.
And I could! The sound was now more transparent, with a slightly brighter presentation. It goes to show how much you can 'tune' a system by using different types of valve! So it's a thumbs up for the PA If you are looking to put together a micro-system of separates, it should certainly be something to consider, particularly along side a class-T amp.
I went back and re-checked my sample and found that the pot was noisy. I had missed this in the review as I had set the pot on the PA and then used the volume control in the power amp. The noise is only when the pot is adjusted and doesn't affect the sound quality but it could be irritating. The situation may be worse in other systems, depending on the equipment involved, and the grounding arrangement. I wrote to Trends but did not get any answers to my questions about these issues. I hope that they will be resolved, and that the Trends distributors will monitor the situation before supplying the PA to the public.
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Dayton Audio PA255-8 10" Pro Woofer
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I recently reviewed the TubePre , a tube-based pre amplifier module from Audiodigit. I was suitably impressed with what that did when connected to the 'right' amplifier, 'right' being typically a chip amp, or one of the 12 volt class-T amps. As you can see from the picture, it also differs from the Audiodigit pre in terms of its size, as well as working as a headphone amplifier. There are two pairs of input RCA sockets.
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