Thanks! Feels incredibly irritating. The previous owner only usel it for headphones and probably hasnt tried the bass boost... If it is a real problem with the hardware, would it be possible to fix it with the hela of an engineer used to tube gear? Wouldnt want the leben to sound different after...

Hi everyone! I just got my Leben CS-300, bought a used one. When testing it with my speakers, I found that the bass boost control made a scraping noise while switching it to 3db and 6db. It also made the volume level differ from speaker to speaker, increasing overall volume on one speaker at 3...

I can only get ahold of Philips marked Mullard EL84 and sylvania black plates. Which of the following preamp tubes would you bet on to go along with the power tubes? And are the Philips marked mullards as good as regular? Siemens 5751 triple mica RCA 5751 black plates Sylvania 5751 Gold Brand...

Thanks to both of you! I checked out the website, but I got a bit confused regarding the stock lists. 6BQ5/EL84 was listaed as 20 tubes in stock, but the brand/version was not present in the list. Only a few selected tubes were displayed on the site. Am i reading it wrong? And skylab, do you...

Hi y'all, first post here! I've got a couple questions about the Leben cs300 (not the XS version). Having read nearly every post in this thread I feel like I understand a bit about this amp, but I'm a bit worried about my upcoming purchase of a used Leben cs300. First of all: it has had...