MATCHED  QUAD BY GAIN 6N6P/6N30P/E182CC TESTED  WITH ROETEST V10  
            
                                                  

                                                                            SAME DATA -1983

                                                                OTK/RHOMBUS

                                                                                Have GOLD GRIDS.


                               NEW in BOX 2 MATCHED UNITS

   Tested with Roetest V10, "the Rolls Royce of tube testers" [emissionlab quote], a wonderful german professional system for testing tubes, it shows everything about a tube.  
      
For sale is a Matched QUAD BY GAIN of 6N6P USSR NOS/NIB tube same data January 1983.

The gain is the output voltage divided at the input voltage, e.g. for 1V input and 20V output we have a voltage gain of 20.

Triodes are most widely used for voltage amplification in our preamps. Here, Mu (voltage gain) is the more important parameter to measure and most directly affects what we hear.

If we use a tube in an operating point with higher plate current Gm will be higher but Rp will be lower so the gain remain constant. The same when the tube is used for a very long time (thousands of hours), the plate resistance will marginally go up, while transconductance will marginally go down in the same rate. This keeps the gain constant until the tube became too weak and must be replaced.

In the testing process many tubes wereburned at once separately for about 1 hour and one at a time moved hot to the tube tester socket, longtime heating and thermal stability at full load reveals any gassy or problematic tube to be removed and increase the accuracy of measurements. After tests we selected in pairs tubes with the same gain for all 4 triodes (6n6p is a double triode so inside of 2 tubes are 4 triodes). The other parameters except gain can be the same or different but all in datasheet range for new tubes.

6N6P is direct replacement for the very expensive 6N30P / 6N30P-EV / 6N30P-DR, some audiophiles recommend this replacement for better sound in some pre/amplifiers, we got feedbacks from buyers about better sound in Audio Research line, LAMM line, Ayon CD.

                                                                                  

Read carefully before bid!!!

Each 6N6P tube I sell was tested for a short period of time in an amplifier, where I listened to some music. And I also visualized - on an oscilloscope screen - an amplified sine signal of 1KHz from a generator. As you can see in the photos below. So, each tube is double tested: in an amplifier and using a tube tester.

Condition for testing 6n6p are as follows: grid bias -2V, 120V plate voltage, 6.3Vdc heater voltage, the expected results as confirmed by the producer are 20-40mA plate current (typical 30) and transconductance of 8.1-13.9mA/V (typical 11), Ig1 under 0.5 µA and leakage h-k under 30µA. We test transconductance dynamically, using 1.4 kHz sine signal filtered and measured at output, with well calibrated L1-3 an L3-3 tube testers. For a pair of 6N6P, we have 4 values for Ip and 4 values for S. Any four values will be maximum +/- 2.5% compared to their average value. That means max. +/- 0.28 mA/V for S and +/-0.75 mA for Ip.

6N6P equivalents

The 6n6p tube is a replacement for ECC99 and E182CC, but only after small modifications in heater circuit (6n6p heater pins 4 and 5, 9 is screen, ECC heater pins 4+5 and 9). ECC99 and E182CC work with 6.3V or 12.6V heater voltage, 6n6p work only with 6.3V. An advantage for the 6n6p – it has a screen between the two triodes inside, which helps to reduce the cross-talk.

You can also try to use the 6n6p in the same socket without any modification, as a replacement for: 6N1P, 6N1P-EV, ECC88, E88CC, E188CC, E288CC, 6DJ8, CV5358, M3624, CV2492, CV2493, PCC88 (this one normally needs a 7V heater voltage), 6922, CCa, 6N11, CV50064, 6N23P, 6N23P-EV. Before inserting the 6n6p as a replacement for above mentioned tubes, you must be sure that your amp supports the higher current consumption of 6n6p, especially where the heater voltage is rectified or rectified + stabilized.

You can use the 6n6p as a replacement for ECC81 or ECC82 but only after taking care of heater differences, easy to adapt, with the same differences like in the case of ECC99 and E182CC.

I have personally tried, in the same socket of my test amplifier, 6N6P, 6N1P, 6N1P-EV, ECC88, E188CC, E88CC, E288CC, 6N23P, 6N23p-EV, 6N2P, 6N2P-EV (with a much higher gain for the last 2, like ECC83 / 12AX7). They all have same pin out. Recently I have decided to listen to any tube I sell. So I have listened for a minute or so hundreds of each

Tubes I have mentioned before. I have noticed no important sound differences, but I can’t say I have the sensitive ears of an audiophile.

I can guarantee that you can hear clear, undistorted music if you use the 6N6P as a replacement for ECC99 or E182CC, and I guarantee the electrical parameters resulting from measurement and sorting tubes.

For sound type, life time, noise, microphonic, and other specific features compared to the replaced tube, please check the catalog sheets and read different opinions on the internet. It is also possible to get a different sound for a different amplifier.

Do not use the tubes over the maximal values recommended in datasheets. If you do this, it will be on your risk!

And safety first: turn off the device, wait a little and always use gloves when handling the tubes. The tube can be hot or it can break when inserted or extracted in/from socket




  • Original name: 6N6P;
  • Type: double triode, pulse;
  • Application: LF power amplification in pulse mode;
  • Cathode type: oxide, indirect heating;
  • Envelope: glass, miniature;
  • Filament voltage, V: 6,3;
  • Filament current, A: 0,59-0,81;
  • Anode voltage, V: 120;
  • Anode current, A: 0,02-0,04;
  • Anode power, W: 4,8;
  • Grid1 voltage, V: minus 2;
  • Steepness, mA/V: 8,1-13,9;
  • Reverse grid current, uA: 0,5;
  • Microphonic noise, mV: 100;
  • Gain: 16,0-24,0;
  • Socket type: rsh8;
  • Maximum weight: 20 gr;
  • Service life guarantee: 2000 hr.


    • Read carefully before bid!!!

    Each 6N6P tube I sell was tested for a short period of time in an amplifier, where I listened to some music. And I also visualized - on an oscilloscope screen - an amplified sine signal of 1KHz from a generator. As you can see in the photos below. So, each tube is double tested: in an amplifier and using a tube tester.

    Condition for testing 6n6p are as follows: grid bias -2V, 120V plate voltage, 6.3Vdc heater voltage, the expected results as confirmed by the producer are 20-40mA plate current (typical 30) and transconductance of 8.1-13.9mA/V (typical 11), Ig1 under 0.5 µA and leakage h-k under 30µA. We test transconductance dynamically, using 1.4 kHz sine signal filtered and measured at output, with well calibrated L1-3 an L3-3 tube testers. For a pair of 6N6P, we have 4 values for Ip and 4 values for S. Any four values will be maximum +/- 2.5% compared to their average value. That means max. +/- 0.28 mA/V for S and +/-0.75 mA for Ip.

    6N6P equivalents

    The 6n6p tube is a replacement for ECC99 and E182CC, but only after small modifications in heater circuit (6n6p heater pins 4 and 5, 9 is screen, ECC heater pins 4+5 and 9). ECC99 and E182CC work with 6.3V or 12.6V heater voltage, 6n6p work only with 6.3V. An advantage for the 6n6p – it has a screen between the two triodes inside, which helps to reduce the cross-talk.

    You can also try to use the 6n6p in the same socket without any modification, as a replacement for: 6N1P, 6N1P-EV, ECC88, E88CC, E188CC, E288CC, 6DJ8, CV5358, M3624, CV2492, CV2493, PCC88 (this one normally needs a 7V heater voltage), 6922, CCa, 6N11, CV50064, 6N23P, 6N23P-EV. Before inserting the 6n6p as a replacement for above mentioned tubes, you must be sure that your amp supports the higher current consumption of 6n6p, especially where the heater voltage is rectified or rectified + stabilized.

    You can use the 6n6p as a replacement for ECC81 or ECC82 but only after taking care of heater differences, easy to adapt, with the same differences like in the case of ECC99 and E182CC.

    I have personally tried, in the same socket of my test amplifier, 6N6P, 6N1P, 6N1P-EV, ECC88, E188CC, E88CC, E288CC, 6N23P, 6N23p-EV, 6N2P, 6N2P-EV (with a much higher gain for the last 2, like ECC83 / 12AX7). They all have same pin out. Recently I have decided to listen to any tube I sell. So I have listened for a minute or so hundreds of each

    Tubes I have mentioned before. I have noticed no important sound differences, but I can’t say I have the sensitive ears of an audiophile.

    I can guarantee that you can hear clear, undistorted music if you use the 6N6P as a replacement for ECC99 or E182CC, and I guarantee the electrical parameters resulting from measurement and sorting tubes.

    For sound type, life time, noise, microphonic, and other specific features compared to the replaced tube, please check the catalog sheets and read different opinions on the internet. It is also possible to get a different sound for a different amplifier.

    Do not use the tubes over the maximal values recommended in datasheets. If you do this, it will be on your risk!

    And safety first: turn off the device, wait a little and always use gloves when handling the tubes. The tube can be hot or it can break when inserted or extracted in/from socket! 

    Please allow for the following shipping times:
    EU countries: 5-8 business days, on rare occasions a few days more
    USA: 10-15 business days, on rare occasions more
    South East Asia (Japan, Singapore, S. Korea, Hong Kong, Taiwan etc) 10 business days, on rare occasions more
    India, China, Russia, Kazakhstan, Pakistan, Indonesia, Malaysia, Thailand, Australia, South Africa etc: at least 15 business days, but frequently around 25 business days
     
    Please note that shipping cost is calculated at average. If you have any objections please contact me for a specific quotation.