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   Home » Melquiades Amplifier » Gas voltage reference 0A2 tubes. (43 posts, 3 pages)
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  »  New  The Shielding Condoms on those tubes......  The Shielding Condoms on those tubes.......  Melquiades Amplifier  Forum     0  24738  09-21-2009
09-24-2009 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,047
Joined on 05-28-2004

Post #: 41
Post ID: 11811
Reply to: 1339
The external shields on the gas tubes.
fiogf49gjkf0d

This post is a derivation from the following post:

http://www.romythecat.com/Forums/ShowPost.aspx?postID=11797#11797

What is interesting is that I have a few the same types of shields for small 7 pin gas tubes and I have tried those shields on the gas regulators on my Melquiades. The shields on the gas tube do not damage sound at all. It is a common practice in past to use in measurement equipment the gas voltage regulators with external shields (in addition to an internal shield that any gas regulator has). Now I tried it on my gas tubes that serve Milq’s bias.

The positive supply gas tube had no difference between “with shields” and “without shields”. On the negative supply tube that cares grid bias the shield effect was auditable. The effect was very different then what it was on 6E5P and the effect was to much less degree. I would not even say that I bas better or worse – it was a tiny bit different but to a degree that I would argue if it was ever important.

Adding the external shields to 0A2 (the Amperex tube with doted internal shield - the best 0A2ever made) made sound a bit firm and a bit stiffer. Not a lot, juts a very little. I do not think that it has practical meaning however….

The caT


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
06-16-2010 Post does not mapped to Knowledge Tree
ghpicard
Posts 12
Joined on 12-15-2008

Post #: 42
Post ID: 13775
Reply to: 11788
Effect of Octal Gas Voltage Regulators (0D3) on Milq sound?
fiogf49gjkf0d
Hi Romy,   I wonder whether you could advance on the octal voltage regulator testing on the Milq, and what your conclusions were. As I have already seen Milq on your new home still with the 0A2s I can assume you weren't much satisfied but as I am going to try your Milq preamp stage (gas voltage regulator biasing included) in a SET of mine, it would be good to know if it's worth to try with 0D3s or if I should go straight to miniature tubes.Gaston
06-17-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,047
Joined on 05-28-2004

Post #: 43
Post ID: 13782
Reply to: 13775
I do not know.
fiogf49gjkf0d
 ghpicard wrote:
Hi Romy,   I wonder whether you could advance on the octal voltage regulator testing on the Milq, and what your conclusions were. As I have already seen Milq on your new home still with the 0A2s I can assume you weren't much satisfied but as I am going to try your Milq preamp stage (gas voltage regulator biasing included) in a SET of mine, it would be good to know if it's worth to try with 0D3s or if I should go straight to miniature tubes.Gaston

Gaston, 

 As you can see a few posts back I was trying it but I did not get a feeling that it was worthy. I did not get any “better” sound. Now, was it before I use specific octal and specific 7-pin tubes that had overridden the different bens the tube times? Good question but I do not know the answer. I decided to abandon further tries without reaching a sensible answer and I did not see a need to gig into the subject deeper.

The caT


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
Page 3 of 3 (43 items) Select Pages:  « 1 2 3
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  A resistor between screen and grid..  How the 6E5P picks microphonics....  Melquiades Amplifier  Forum     9  100009  10-20-2005
  »  New  Headphone amplifiers. Baby Melquiades?..  The survival guide...  Melquiades Amplifier  Forum     27  287027  11-25-2005
  »  New  The Melquiades' "Remote Biasing"..  The Melquiades' "Remote Biasing"...  Melquiades Amplifier  Forum     0  22173  02-05-2008
  »  New  The Shielding Condoms on those tubes......  The Shielding Condoms on those tubes.......  Melquiades Amplifier  Forum     0  24738  09-21-2009
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