| Search | Login/Register
   Home » Melquiades Amplifier » The 6E5P tube data. (45 posts, 3 pages)
  Print Thread | 1st Post |  
Page 3 of 3 (45 items) Select Pages:  « 1 2 3
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  Melquiades: too early for a verdict?..  Non-Melquiades amplification: not good anymore.......  Melquiades Amplifier  Forum     6  68918  03-27-2005
  »  New  A resistor between screen and grid..  How the 6E5P picks microphonics....  Melquiades Amplifier  Forum     9  64340  10-20-2005
  »  New  Headphone amplifiers. Baby Melquiades?..  The survival guide...  Melquiades Amplifier  Forum     27  196633  11-25-2005
  »  New  7788 tube mic pre design..  Read my leaps: Absorb-GEL...  Analog Playback Forum     38  239187  02-14-2006
  »  New  Driver tubes, grid leak biasing, and fidelity..  Re: My very different objectives...  Melquiades Amplifier  Forum     7  62541  02-16-2006
  »  New  DRU Tube for Melq’s HF channel...  DRU Tube for Melq’s HF channel....  Melquiades Amplifier  Forum     0  16533  05-14-2006
  »  New  Get, or made up a tube tester, it’s necessary..  The 6E5P-E vs 6E5P....  Audio For Dummies ™  Forum     47  266727  01-07-2007
  »  New  The one-stage Melquiades...  Tubes vs. Speakers vs. FR...  Melquiades Amplifier  Forum     73  434923  04-21-2007
  »  New  Super Melquiades, Macondo and Class A2..  Super Melquiades, Macondo and Class A2...  Melquiades Amplifier  Forum     0  18856  12-05-2007
  »  New  Single-stage Melquiades vs. DHT amps..  A hallucination?...  Melquiades Amplifier  Forum     397  2438711  11-22-2008
06-15-2014 Post does not mapped to Knowledge Tree
Celsius
Posts 5
Joined on 11-06-2013

Post #: 41
Post ID: 20992
Reply to: 20366
6 Month later
fiogf49gjkf0d

Hello Romy, I finished the 6e5p – 211 amp,  I  help the 6e5p with CCS  to drive the 211, the 6e5p is not a easy tube, it is very exigent. At the begin give me a lot headache, oscillating a lot and give me a horrible sound, later I put a 1k grid stopper ti G1 and the oscillating finished. Too I had to move many times the bias point, sorry for not read you before, the 6e5p fell better far of the -2v bias and is very audible the different, now I use a battery Ni MH as cathode bias with 3 AAA at 3,8v, after tested resistor-cap ( Silmic II)  and Led bias ( red, green and blue ) , one day I tested the diodes  1N4002  4 pcs in line to give 2,9v but too was horrible.  Now I use the battery as the winner.

Well I have two different lot of 6e5p and I have found a big sound differences:

Lot 1  Reflector  1973    the sound is no bad but far of gentle and close

Lot 2 Reflector  1967 OTK logo  more open, more air, more all. 

In your big experience about the 6e5p same recommendation about which year or factory need to buy.


Here a pic of the baby 6e5p-211


06-15-2014 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,486
Joined on 05-28-2004

Post #: 42
Post ID: 20993
Reply to: 20992
How the amp sounds?
fiogf49gjkf0d
Celsius, I do not know what CCS you impended, did you drive 6e5p’s plate with constant current source? I also do not know/like 6e5p with battery bias. The only application that I find 6e5p suitable was the Milq-style bias with two gas tube driving voltage across a grid resistor. I endorse only this application with THIS tube and I am not qualified to talk about sound of this tube in other configurations as I did not like this tube in any other configuration I have tried.

About the oscillating. Yes, a grid resistor, a ferrite bid in the grid do help. Some of them oscillate more than another however. The 3,8v for bias is about right. The cathode bias with batteries – I do not know about that.

About the vintage - it is universal rule for tubes and for Russian tubes in particularly – the older tube are better than newer. The presence of OTK logo I find is irrelevant but the fact that the tube 7 years older is good.



"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
06-15-2014 Post does not mapped to Knowledge Tree
Celsius
Posts 5
Joined on 11-06-2013

Post #: 43
Post ID: 20994
Reply to: 20993
Good and neutral
fiogf49gjkf0d
 Romy the Cat wrote:
Celsius, I do not know what CCS you impended, did you drive 6e5p’s plate with constant current source?*1 I also do not know/like 6e5p with battery bias. The only application that I find 6e5p suitable was the Milq-style bias with two gas tube driving voltage across a grid resistor. I endorse only this application with THIS tube and I am not qualified to talk about sound of this tube in other configurations as I did not like this tube in any other configuration I have tried.

About the oscillating. Yes, a grid resistor, a ferrite bid in the grid do help. Some of them oscillate more than another however. The 3,8v for bias is about right. The cathode bias with batteries – I do not know about that.

About the vintage - it is universal rule for tubes and for Russian tubes in particularly – the older tube are better than newer. The presence of OTK logo I find is irrelevant but the fact that the tube 7 years older is good.


The sound is good but the 211 need a lot of time to break in now with 150 hour is not enough. One friend told me that at less need 300 to 1000 hour, my last 6c33 needed  a lot of less time to give happy hours
The sound signature is very neutral, but I am not sure which tube like  more,  my last with the 6c33 or the 211, I need to give more time,  all components must break in included the teflon capacitor FT3.

This is my first DiY amp and your ML is a little dificult to begin, I had good luck that  the battery bias run very good, I recommend this bias over led or resitor-cap.

about the CCS is two dn2540 in cascade but I am not sure if like more with or without, I need more time.

thanks



02-05-2015 Post does not mapped to Knowledge Tree
shannon
Posts 22
Joined on 08-08-2014

Post #: 44
Post ID: 21530
Reply to: 20994
Look of getter
fiogf49gjkf0d
Some few 6e5p have black dull getter not shiney chrome getter. never been used and they still test normal. do they sound any different? 
10-25-2015 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,486
Joined on 05-28-2004

Post #: 45
Post ID: 22155
Reply to: 4805
Bartola Valves: 6e5p beam tetrode SPICE model
fiogf49gjkf0d
A nice British guy:

http://www.bartola.co.uk/valves/tag/6e5p/



"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 (45 items) Select Pages:  « 1 2 3
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  Melquiades: too early for a verdict?..  Non-Melquiades amplification: not good anymore.......  Melquiades Amplifier  Forum     6  68918  03-27-2005
  »  New  A resistor between screen and grid..  How the 6E5P picks microphonics....  Melquiades Amplifier  Forum     9  64340  10-20-2005
  »  New  Headphone amplifiers. Baby Melquiades?..  The survival guide...  Melquiades Amplifier  Forum     27  196633  11-25-2005
  »  New  7788 tube mic pre design..  Read my leaps: Absorb-GEL...  Analog Playback Forum     38  239187  02-14-2006
  »  New  Driver tubes, grid leak biasing, and fidelity..  Re: My very different objectives...  Melquiades Amplifier  Forum     7  62541  02-16-2006
  »  New  DRU Tube for Melq’s HF channel...  DRU Tube for Melq’s HF channel....  Melquiades Amplifier  Forum     0  16533  05-14-2006
  »  New  Get, or made up a tube tester, it’s necessary..  The 6E5P-E vs 6E5P....  Audio For Dummies ™  Forum     47  266727  01-07-2007
  »  New  The one-stage Melquiades...  Tubes vs. Speakers vs. FR...  Melquiades Amplifier  Forum     73  434923  04-21-2007
  »  New  Super Melquiades, Macondo and Class A2..  Super Melquiades, Macondo and Class A2...  Melquiades Amplifier  Forum     0  18856  12-05-2007
  »  New  Single-stage Melquiades vs. DHT amps..  A hallucination?...  Melquiades Amplifier  Forum     397  2438711  11-22-2008
Home Page  |  Last 24Hours  | Search  |  SiteMap  | Questions or Problems | Copyright Note
The content of all messages within the Forums Copyright © by authors of the posts