Tag: 6E6P-E

Russian pentodes in triode mode

After some proper time tracing the curves, here are a set of Russian high-frequency pentodes in triode-mode for comparison. I was looking at closer ones to D3a and these are the ones I had at hand and wanted to include in the tests:

6Z5P 6Z9P 6Z11P 6Z49P-D 6Z51P 6P15P 6E5P 6E6P-E D3a
Vf [V] 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3 6.3
If [ma] 450 300 440 300 300 760 600 610 315
Pa [W] 4 3.75 6 3.4 3.5 13.5 10.6 8.8 4.5
Gm [ma/V] 7 35 33 17.75 29 16 32 25 34
μ 44 36 40 44.3 79.5 22 30 34 68
Ra [Ω] 6K2 1k 1K2 2K5 2K7 1K6 960 1K3 2K
Ia [ma] 16 29 40 15.7 23 52 50 30 22
Va [V] 252 125 150 200 150 250 200 200 200

Well, as you can see in the table above, the 6e5p and 6e6p-e (both tetrodes) were included in the list.  Some interesting points to highlight:

Continue reading “Russian pentodes in triode mode”

6Э6П-E and 6Э6П-ДР datasheets

Thanks to Vyacheslav Kalashnikov who kindly did all the work here so here are the translated 6E6P-E/6Э6П-E and 6Э6П-DR/ 6Э6П-ДР datasheets:

6E6P-DR6E6P-E и 6E6P-DR

Looking at the 6Э6П-DR/ 6Э6П-ДР, there is a minor difference in the transconductance and anode current variance. Also the heating requirements are less demanding. Interesting to see though, is the fact that the 6Э6П-ДР grids can handle a bit more of extra power.

The proof is in the pudding, so we need to test the sound differences amongst these two valves and 6E5P/6Э5П!

 

6E5P/6Э5П and 6E6P-E/6Э6П-E in triode mode

One of the first valves I traced with my curve tracer was the 6E5P/6Э5П. It has a very good reputation when triode-strapped. I did many tests and found this one being a superb driver given is one of the most linear valves out there. Many use them as a 300B driver. I will probably implement Rod Coleman’s shunt cascode topology in my 45 SE or in a 6C4C/4P1L PSE design.

Over the weekend I traced many valves as managed to recalibrate the oscilloscope and tracer and wanted to play with some samples I had around.

Here is the 6E5P/6Э5П in triode mode:

65ep triode SMALLAnd here are the updated SPICE model parameters:

6e5p triode modelNow, let’s have a look at it’s close brother the 6E6P-E/6Э6П-E in triode mode. It has a long life (10,000 hours against only 500hours):

6e6p-e triode SMALL

6e6p-e triode modelMany praise the 6e6p-DR tetrode over these two, I haven’t tried it yet myself but here are the minor differences between  6E5P/6Э5П and 6E6P-E/6Э6П-E to highlight:

  • Both 6E5P/6Э5П and 6E6P-E/6Э6П-E have very linear curves!
  • 6E5P/6Э5П: less anode resistance and higher transconductance compared to  6E6P-E/6Э6П-E which seems to have a tad more of gain