| Home » Classified Ads » Stuff » Appliances / Electronics |
DIAMOND MATCHED QUAD 6P14P-ER /EL84/ TUBES LONG LIVE/ GOLD GRID/ OTK/RHOMBUS!NIB
|
₱ Ad Type: For Sale | Location: Outside Cebu
| Views: | Comments: | 10 March 2023
| |
|
MATCHED QUAD TUBE NEW IN BOX FROM 1980-89!!! Military equipment <rhombus>,""OTK"", high reliability. 6P14P-ER is the best variant between all 6p14p and EL84 tubes, a classification of qualities in ascending order would be 6p14p, 6p14p-k, 6p14p-v, 6p14p-ev, 6p14p-er, ER variant being high reliability, long life an tight specs tube, NOS -from the times when there was no saving for rare metals and precious metals, especially for military use tubes. Each tube contains few mg of pure 24K gold for g1. This tubes were tested on high end russian military tube tester L1-3 by a qualified engineer! 6P14P-ER is an a excellent tube to use in audio amplifiers, it has 5000 hours lifetime guaranteed by manufacturer and is the same tube/direct replacement with EL84, EL84M, 6BQ5 etc. Each tube is heated for at least 30 minutes, listened in an amplifier with plate current monitoring and a 1 kHz oscilloscope view of a sine wave. After that each tube is tested using L1-3 or L3-3 tube tester, first for shorts, leakage heater-cathode and Ig1 no more than 0.1 micoA and then are meaured plate current and transconductance. The sorting of tubes in pairs or quads is done taking into account both the anode and the transconductance. For example, in a pair of 0% both tubes have exactly the same anode current and the same transconductance at the test conditions: Up=256V, Ug2=256V, Uh=6.3V, cathode biasing." Pictures Share this AdAdvertised byAd Phone Number: | |
| Total comments: 0 | |