Vh4 preamp tubes and microphony

[bronz79]

Hi,
my previous peamp tubes are:

v1,v2 highgrade sovtek 12ax7WA
v3,4,5,6,7 selected no brand 12ax7A

Today i've changed,
v1,v2 Ruby 12ax7ac5 HG+
v3,4,5,6,7 Ruby 12ax7ac5 HG

The tone is avesome ,even on clean..but switching from ch3 and ch4 and viceversa i hear a litte sound: "tin"..
more gain and volume more "tin".
Is not very important but with sovtek no microphony.

So my questions are:

1) ruby HG+ only in v1,v2 or is better also in v3,v4?
2) the little noise descripted is caused only by little microphony the v1,v2 gain stage..or can be also in v3,v4?
3) i'm damned to swich tubes until i found no microphony in gain stage:v1...v4?

Thanks.

 

[Peter Diezel]

Get a 12AX7AC5 HG+ Diezel selected for V1 and V2 from Magic Parts / Ruby Tubes

 

[bronz79]

Get a 12AX7AC5 HG+ Diezel selected for V1 and V2 from Magic Parts / Ruby Tubes

Many thanks Peter!

So the HG+ Diezel selected are even less microphonic then "the normal HG+"?

 

[bronz79]

Problem solved by myself.
2 ruby HG are microphonic,i've changed them.

Now:
v1,2,3,4 HG+
v5,6,7 HG

I'm waiting the substitution of the microphonics tubes by the italian Ruby distributor,
then i'll place them in v3 and v4 'cause i don't need Hg+ in them.

 

[VoodooChild24]

Problem solved by myself.
2 ruby HG are microphonic,i've changed them.

Now:
v1,2,3,4 HG+
v5,6,7 HG

I'm waiting the substitution of the microphonics tubes by the italian Ruby distributor,
then i'll place them in v3 and v4 'cause i don't need Hg+ in them.

Awesomeness!

 

[bronz79]

Microphony problem solved.
But a little problem.
I live and play in an enviroment with RFI issue then sometimes i hear a radio background
of course amplified on ch4.
Is a little noise even in ch4..a little noise that at guitar pot volume opened is covered.
Any ideas?
I can't put of course myself inside a faraday cage..