I can confirm what people say about this amp:
Stock chinese tube from stock model sounds like CR*P, insta-roll recommended, it has no scene (k701 sound like closed headphones with this tube its THAT bad) and bass is awful.
I switched the stock tube for RFT ECC82, and i got hypnotized with the sound clarity, control and scene instantly when i turned it on, even thou it wasn't burned in yet.
This amp offers sound compared to 3x more expensive hybrids. Actually i boutgh all Trends Audio products and i can recommend them all, especially the TA-10.
I read that you can't just pull and plug a replacement tube for this amp? Something about having to match voltage or something....I dunno. Is it just plug and play?
I bought mine 2nd hand and when music is not playing or is on low volume, I hear noise/hiss/light crackling in my left earphone. I've tried with my DT880 250Ω and Triplefi10. Sounds clean and decent to me, but maybe no warmth that I was expecting (my first tube amp). What could this hiss be? It's not the source or the source cable. Even with no input the sound is still there when I plug in headphones or IEMs.
when i pulled it, the hiss/fuzz/light crackling sound went away. that's probably a good sign, right? just need to replace tube?
In fact, after I plug it back in, there is no sound even when I turn it on. It takes a minute or so for it to warm up and make that sound in the left ear... Again, i can't hear this noise when I have my music up at listening volume.
http://tctubes.com/mullard-12au7-ecc82-iec.aspx is what it has in there. Mullard IED 12AU7A/ECC82 GT. BRITAIN . Does this mean that it isn't the stock cheap tube? It's around $50 on that website for one tube, while there are ones that sell for less than $15.
Also a heads-up I'll be posting this in the classifieds as soon as I'm able since I want something portable soon. I joined sometime early February..
Any help? With the hiss/fuzz in the left channel... To replace tubes you have to use a multimeter? something about resetting jumpers or something. I found this review on amazon: http://www.amazon.com/review/R18QGQE8CZI0VA
Re-setting the J3, J4, and J5 jumpers to take a 12AU7 tube and installing, in this case, the JJ european-number 12AU7 equivalent, the difference was immediately apparent.
With the 12AU7, the PA-10 is stunning - it really opened up - solid and even through the frequency range and at all volume levels, very dynamic, excellent presence and separation both as a preamp AND with headphones (Grado 325i in this case). In this configuration, definitely a very good amp for the price.
With a multimeter, setting the bias and changing the internal jumpers is easy - with the 4 top face plate screws the top lifts off to allow access to the test points, pots, and jumpers. There is a short technical page from the Trends site that details this, and there is also a version of this amp available with a 12AU7.