Open box , maybe 50 hours of use , silver. Got it in exchange for something I don't remember anymore. Warmish sound signature ,hefty transformer inside and class D power stage . Well regarded little lifestyle amp. Kept it to pair with Nagra pre which was relegated to a display role since. Box and everything included, pictures follow . $200 ..read more

Hello, I just registered and I am so happy to find this forum. I am 22 and trying to build my first tube amp. Hope that I can add some questions here. I am building a push pull 6550 power amp with cathode bias. It looks that could be work. My first question is. I am measuring about the double AC current before rectification compared with the total cathode DC currents. Why is that? thank you so much ..read more

Guys, i know you both have your webpages excel workbook on Brian's , and freecad scripts on Lords i want to tweak this design for different drivers is the Staiper mini scooper MS-18 MK2 and MK3 source page here MS-18 MKIII ..read more

Hello everyone! Whith BMS should i choose or your recomend for LiFePo4 batteries 24V-320Ah? LiFePo4 batteries for 8pcs 3.2V-320Ah. Thanks ..read more

I wrote this here but probably it was the wrong place. I think it's better to open a discussion. I have an audiosector premium kit based on the LM3875 (Audiosector by Peter Daniel). The input impedance is set by R2=22K. I need an higher Zin because my tube premp likes higher Z. Have somebody tried an higher R2 value (like 50K-75K ..read more

I just upgraded my ABEC 3 to AKABAK 3. The most difference compared to the former is the GUI. This is a big improvement to the original script based input for some users (me too ..read more

https://www.hificollective.co.uk/sites/default/files/mdt-33-datasheet.pdf Morel MDT33 -legend MADE IN ENGLAND condition close to new i have 2 pair this one used once for test sound very close to beryllium tweeter sound clear and crisp box and all pack original condition 400$US pair These tweeters represent the finest in soft dome tweeter construction. Features a treated 1-1/8" soft dome, ferro fluid cooled aluminum voice coil, and double magnet system that is vented into a damped... Read more ..read more

I need more gain out of the phono amp I built and am exploring the SUT route. I have a Dynavector DV20X2H cartridge. Output 2.8mv Impedance 150Ω Recommended load >1000Ω From the reading I have done and I'll admit I don't have a comfortable amount of understanding but it seems like I would want to increase the output to roughly 5mv to put it on par with most MM carts. What ratio SUT do I want? 1:2? Then to get my 1000 loading parallel the 47000 with a 5.1k resistor which is divided by... Read more ..read more

suitable for small gatherings and lower spl material. The cabinet is 0.83X scale of a cabinet published by BesPav for Fane's "triple cone" 12 inch fullrange speaker ..read more

Greetings All, My first post here. I am building the Nutube preamp kit and may have a packaging error. I have begun the assembly of my preamp kit and on confirming the parts selection to the instruction sheet document I may have found a discrepancy. The write up states that the jfets Q1 and Q2 are different and packaged accordingly. However I have found that while the Q1 package contained 4, FKH35 J113 fets, the Q2 package contained 2, of FKH35 and 2, of WH44 J113 fets. This raised a red... Read more ..read more