Nobsound Class A Bouwpakket buizenversterker 6n9p en 6L6GCR Tube Amp Stereo Amplifier zelfbouwkit, HiFi 2.0 Channel Valve versterker, 7 W x 2

The amp sounds well on my full-range loudspeakers. The kit misses some parts: a solderingstrip (see second image), some soldering lugs for the ground near the rectifier tube (third image) and enough screws for both side and bottom panels. To build it you definitely need some prior experience in building a tube amp. Two different schematics are provided as well as a wiring diagram. The schematic in chinese only is the right one. The difference is in the 470k grid resistor for the preamp tube. It is not with the parts, but is not necessary.

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Un buen amplificador para aprender como funcionan y empezar a hacer modificaciones.Posibles mejoras fáciles que puedes hacer tú mismo:- Recomiendo montarlo con un filtro EMI - EMP para evitar que se cuelen ruidos desde la red eléctrica.- Revisar el transformador principal ya que está diseñado para 220V ~ y no 240V

Sono passato a questi finalini da 7watt dopo aver utilizzato un marantz da 50watt per canale, il suono delle valvole non è minimamente compatibile, la dinamica è fantastica e sembra di avere molto più watt sotto al cofano. Ho migliorato il kit utilizzando componenti elettrici con tolleranze decisamente migliori, aggiunti filtri EMI ERF, aumentato condensatori di livellamento del aggiunto condensato propilenici in parallelo a quello di filtro per le alte frequenze, presto installo l'induttanza da 5H anche sul pre della nobsound. Lo schema è semplice così come il montaggio se si ha un po' di esperienza con apparecchi a valvole, rumore di fondo inesistente e suono fantastico, ho fatto anche delle modifiche estetiche come da foto, pomello potenziometri in ottone e piedini di disaccoppiamento in alluminio

Very nice kit for the money. I first bought a preamp of the same company that works great. The kits are well documented. Delivery was quick, and it was packed well. Unfortunately a dented output transformer but it does not bother me.Like I said the kit is well documented with a both wire diagram and schematic. Not a kit for a first timer, please be careful.Overal the sound is a classic class A. Vocals are nice and crisp. It needs some more hours to run to make a final judgement.In combination with high sufficient speakers (WLM Diva in my case) and the pre of nobsound it makes a great set that makes me very very happy.“2 months later”(forgot to press the submit button and it was brought to my attention to write a review.)The soundstage is great, I really like the vibe of the amp. Due to the small transformers there is a little lag of punch and sustain in the low frequencies. You might also describe it as easy listening. It’s a classic battle in the tube amp industry so nothing to worry about especially not in this price range. Like I said the build was fun and the amp does not disappoint me.With a proper pre glow of 10min the single ended amp never fails to surprise me. Something my much more expensive push and pull tube amp never really did.After some tube swaps with very awesome Russian tubes I can truly say that the stock tubes you get with the kit are a nice fit with the electrical design. I did replace them now like you can see on the last picture.While building I would suggest one star ground instead of the several as on the picture.Overal it is a nice eye catcher, with the added pride that all diy-ers have about their own build projects. But most of all, it’s a great sounding amp for the money and it will not disappoint you.

2 condensateurs HV manquants mauvaises valeurs des condensateurs de filtrage des etages de préamplification et d'amplification, 3 plans A4 livrés, tous avec un problème de manque d'information , problèmes de ronflement.il faut un plan precis à propos du cablage des masses, celà ferait gagner du temps!une photo du cablage d'un montage qui marche serait souhaitable. Des instructions en anglais aussi ! (erreurs à éviter !)Très bon kit pour appréhender le monde des amplis à tubes!Il semble que la grande majorité des problèmes rencontrés sur un ampli à tubes soit dûs au cablage et au routage des masses.sur YT, voir " AUDIO et RADIOS à TUBES" chaîne francophone.