Description: For sale is a matched by gain quad of 6N3P-E made in USSR in november 1984, NOS in bulk boxes 200 pieces each, were sealed before tests. 6N3P-E has tighter spread range for parameters, is long life tube like 6N3P-EV and rigidized with 3 mica like 6N3P-DR, in audio fields means long life and no microphonic.6N3P-E has the best price/quality rate from entire series: chinese 6N3, russian 6N3P, 6N3P-EV, 6N3P-DRIn the pictures you can see examples of data and curves for few tubes and original datasheet from actual bulk box. A quad matched by gain means 4 tubes (all inside 8 triodes) with the same or very very close gain, max. difference accepted is 0.2, can be seen in pics example of gain values for 2 quads.The gain is the output voltage divided at the input voltage, e.g. for 1V input and 33V output we have a voltage gain of 33.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, Mu=Gm x Rp. The same when the tube is close to end of life the plate resistance will marginally go up, while transconductance will marginally go down in the same rate. This keeps the gain constant.All quality tests were made, vacuum, leaks, shorts, heater current, measured parameters (plate current, gm, gain, plate resistance), and then selected pairs with same gain for all 8 triodes inside.Test conditions: heater 6.3V, plate 150V, grid -2V.As datasheet, good new tubes are: plate current 5.5-12mA, transconductance 4.1-7.8mA/V, gain 28-42, all tubes in this selection meet datasheet requirements for parameters.Grid is gold plated, 0.55mg pure gold in each tube.If you need pairs/quads matched by curves / plate current and transconductance please see our other listings. Tested with Roetest V10, a wonderfulgerman machine for testing tubes, it shows everything about a tube, "the Roll Royce amongst the new production tube testers, it is at this moment the finest product on the market and nothing will outdo it" [emissionlabs quote].We ship the tubes safe packaged, without individual boxes.Just ask if you need more details,we'll answer fast.Please take a look at our other listings to save combining shipping. You will love the rich,detailed sound they produce, and the negligible amount of hiss or hum.We send next day after payment,priority mail with tracking number. Please be patient with shipping time thatcan be surprisingly fast or disappointingly slow, depends only by post services.
Price: 34.99 USD
Location: Bucharest
End Time: 2024-08-19T08:28:20.000Z
Shipping Cost: 12.8 USD
Product Images
Item Specifics
All returns accepted: ReturnsNotAccepted
Model: 6n3p
Country/Region of Manufacture: Russian Federation
Type: NOS Tube
Brand: Reflektor
