After aprox. 30 minutes burn in each tube was tested to be with all parameters in datasheet range. Last picture show an example of test protocol, can be seen heater test, shorts test, leakage test, vacuum test, measured parameters plate current, gm, gain, plate resistance, settings for the test etc.

Tubes from this listing were testing for good/bad, no data saved, no measured data delivered to the buyer. For tubes delivered with full data, matched pair or quads please see our other listings.

6N1P is direct replacement for chinese 6N1, for ECC88, E88CC, 6922, E188CC, ECC85, their datasheets are not perfect identical but will work for sure.

The tubes are delivered very safe packaged in a box (no bags or envelopes), without individual boxes, is someone buy 100 items we deliver them in original factory bulk box.

Tested with Roetest V10, a wonderful german 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].

Just ask if you need more details, we'll answer fast.

For 6N1P/6N1P-EV single tube, pairs, different date, types or matching or for other types of tubes please take a look at our other listings. We sell only NOS well tested tubes. 

 You will love the rich, detailed sound they produce, and the negligible amount of hiss or hum.

We send next day after payment, priority airmail with tracking number. Please be patient with shipping time that can be surprisingly fast or disappointingly slow, depends only by post services.