Anybody did try this tube preamp ?

[gaetan8888]

Hello

Anybody did try this tube preamp, how does it sound ?

It use the easy to find 12AX7 tube.

http://www.shine7.com/audio/12ax7_pre.htm

The plate current is at 1.5mA, is it not a bit too high for 12AX7 ?

I found the low distortion and low Z out of this preamp to be interesting.

Thank

Bye

Gaetan

[hotbottle]

It's power that's limited to 1.2 watts, Ik is about 8 ma.

I will bet it sounds great. Simple triode circuits with no global negative feedback make a nice amplifier.

In fact, I have a system that has nothing but common cathode triode gain stages from magnetic cartridge to output, and I love the sound

[CarlyBoy]

Anybody know what software is being employed in the screen shots?

[gmilitano]

The software is RightMark Audio Analyzer.

[gaetan8888]

Hello

About global negative feedback, I think that can use a max of 8 db NFB and we would still have a great tube sound.

Bye

Gaetan

[Atom666]

Hi
Anybody know where that prototype board and pins he is using comes from?
Andrew

[kstagger]

Originally posted by Atom666
Hi
Anybody know where that prototype board and pins he is using comes from?
Andrew

I've seen something like them for sale on Fleapay
http://cgi.ebay.com/MULTI-PURPOSE-TU...QQcmdZViewItem

not associated with seller, etc

[leadbelly]

The preamp in question was already posted here:

My 12AX7 zero negative feedback preamp, with measurement

[gaetan8888]

Hello

Here is another tube preamp schematic, it's a low Z output, so maby it can drive transistors output for an hybrid amp.

Gaetan