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05-14-2006 Post mapped to one branch of Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,540
Joined on 05-27-2004

Post #: 1
Post ID: 2405
Reply to: 2405
DRU Tube for Melq’s HF channel.

Those damn Russkies always threw surprises. Using in Melq the Russian-made tubes, probably very few the most remarkable tubes they ever made, the life defiantly threw some hi-fi astonishments.

The people who follow my saga with Melq know that I do not use in Super Melquiades’ HF channel the 5E5P but rather 6E6P. It is basically the same tube but I find it slightly softer, more elegant and more sophisticated sounding. A have also the 6E6P-DR with is high reliability (perhaps military) version of 6E6P, with better construction, 10.000 hors of life-time, and so on. I use 6E6P-DR routinely in Super Melq’sa HF channels and it does fine.

A few weeks ago I dug a party of strange tubes: 6E6P-DRY(DRU). When I got them I was very surprised. They are from 1972, gold pins (Russian tubes with Gold pins (!), and they are all heavily pre-burned. I know that Russian special QA for top-notch military application burned the tube and then mach them 15% into their life expectancy. It looks like they are a party of those tubes. What was also interesting that all of them have their gloss tips submerges in some king of transparent bluish coating… Very interesting.

I run those tubes on tester and the showed mutual conductance and gain, as they are new. Well, I said… and forgot about them. Today I spoke with Dima and he proposed the those tubes besides everything might have different coating on the cathode that might make then even to sound deferent. So I tried. Yes, the do sound different and they are even more soft and tuneful then regular 6E6P-DR.

Now is the mystery: what DRY means? None of the book that I have mentions anything about the DRY. None of the tubes gurus I asked, including Russian guys ever heard about the DRU. Does anyone know anything about the DRY (DRU)?

Rgs,
Romy 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 1 of 1 (1 items) Select Pages: 
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  An amplifier for Tweeters..  The 7721/D3A as the tweeter diver....  Audio Discussions  Forum     17  133436  09-03-2006
  »  New  The 6E5P tube data...  Bartola Valves: 6e5p beam tetrode SPICE model...  Melquiades Amplifier  Forum     44  322299  07-23-2007
  »  New  Small SET’s bass, besides everything- is it about power..  Importance of OPT and type of tube for SET amp bass per...  Audio Discussions  Forum     4  61358  01-12-2009
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