Virtual Tube bake-off - compare ECC83s

Phono circuit:

The tube swapped out is the one on the right at the output:




Now, where did I put the paper with the noise readings ...........

 

That looks like the version I found but with the cathode bypass and input caps deleted and HT filtering for the input tube.

It would be interesting to know if the DC around the output tube changes when you change the tube.

Paul

 

great thread Rob.

I've always found valve changes subtle, but differences are there for sure.. but less so in power tubes. I'm not sure why that is however (?)

 

quote

hi chis, how is the amp coming along? do not use a broomstick to power it up,
nando.

 

not a metal one anyway

nearly ready. It's not being made by me, so it should work brilliantly ha.

now lets see if it's as good as the hype, or ...not....

 

cant't wait to have one hope rob has rubber gloves, i am ssure it will be the bees nees,
nando.

 

p.s and a pint of bulmers, ice cold,
nando.

 

This is the very same rubber glove that I used to switch on my valve amplifier for the first time after building it

 

Now that's confidence!

 

quote

rob, where is the broom?
nando.

 

There is shame enough in admitting to the glove

 

but it worked did it not? mind you i would of done the same, would got a distant relative to power it up while i was not there and finers crossed(s i c )
nando.

 

HI Rob,

I was just curious to know how you get to have a listen of those tracks.

When I clicked on the links I got nother web page ....some thing else to download?

HOw do I get to burn those tracks onto a cd?




Cheers,



D.


edit, right it, got track one

sounds very nice

 

i know i'm boring but any test of modern production ecc83s should include sovtek 12AX7 LPS - it's different due to spiral filaments and very thick glass. the sound is way way beyond its price plus it's extremely reliable.

 

The Edicron in Rob's test is a rebadged Sovtek LPS, it's my tube and is identical to the cryo'd Sovtek LPS currently in my amp. It's a great tube in the phase splitter position in my Prologue 2, I can't find anything to beat it in the bass / timing areas.

Tony.

 

exactly. gives a hard time to $$$$ NOS telefunkens in my EAR834p

 

Yes, and does it here too IMO - compares very well with the Telefunken and Mullard.

One test I didn't perform was for microphony. Would have been useful perhaps.