12au7

I am looking for a DAC (hopefully with good bluetooth) with a vacuum tube pre-amp or buffer. Many DACS slash pre-amps use tubes for a "coloration" stage. I am not looking for this - this to me is using a tube to poison the audio. Problem is the signal to noise ratio is so poor searching for...

Hi! Calling for your great experience to help me identify these tubes that I came across recently. Mullard old logo "Made in Great Britain" 12AU7 ECC82, but not much more info. The etched code is completely off on 1 tube and the other is suuuuper hard to read. It's definitely yellow paint, I...

I’m up to my eyeballs in 12au7’s. There’s alot of tuners and receivers out there that use 12at7’s in the fm mixer/ oscillators. What happens if I put a 12au7 in place of the 12at7? Yes I’m aware that I can get a 12at7 for $10 but I’m just curious what happens.

I recently acquired this preamp from Nobsound/Douk Audio. It is based on the Marantz 7 line stage with the Shigeru Wada circuit mod. It had two 12ax7s and two 12au7s from PSVANE. Stock tubes sounded awful. It was very metallic and the bass was really weak. So, I ended up replacing the 12au7s...

Hi guys! I'm totatlly new in this field, I have done some research to learn the best cabinet I would build for my pair of chinese speaker 4" Aucharm DG-403...

I was advised that this mod was safe and have been using an adapter for it but the nagging feeling in me suspects that I will do eventual harm to my 240. I need some hard facts here if anybody has it as to why I should or shouldn't continue. Just playing it all safe!!! Thank you in advance.

I have a 12au7 in my MC30 already but I’m just curious to see if the 12at7 would change the sound at all. Thanks in advance

Hey all, I recently built a Bottlehead Mainline Headphone and wanted to buy some tubes to have on reserve. The Mainline has 2 * 6c45pi and 1 * 12AU7. I don't think there a much options for the 6c45pi and found some OS Reflektor which is the same as was supplied with the kit. For the 12AU7...

Hi all, So I recently purchased this Integrated Amp, and I must say, I am shocked at how good it sounds. What a beautiful machine. However, after listening for a few days, I noticed that the B channel was lagging behind the A in volume. I cleaned the potentiometers on the balance, volume...

Hello there. I own a Unison Research Simply Italy, which I adore. It uses two EL34 and two ECC82 (12au7) as rectifiers. So recently I decided to upgrade the 12au7's. After doing a lot of research, I went with the Psvanes. Right out of the box the sound was clearly more open and detailed than...

I've noticed that E90CC's are more reasonably priced and considering there don't appear to be many NOS 12AU7 available if these work then it opens up a few more choices. I know I've subbed 12AU7's for 6414's in the past with good results despite them being closer to a 12AT7 spec than 12AU7...

My first ever dual pairs of NOS vacuum tubes; a pair of '83 JAN Philips 12AU7 output tubes, along with a pair of '83 JAN Philips 12AU7WA tubes for the AMC CVT1030s phono stage. A major improvement over the stock Chinese and Sovtek tubes that came with the preamp.

Left>right: Hytron 5814 / Sylvania 5963 / RCA 5814 [input/driver] tubes. The 1953 Hytron 5814's are my personal favorite.

I got these for my Foreplay all the way from Japan - Thanks John EH