1LH4 METAL BASE
  • 1LH4 METAL BASE
  • 1LH4 METAL BASE
Philco

1LH4 METAL BASE

5.00 USD

Fine loctal-based diode-triode glass tubes manufactured in US by renowned Philco. Designed as detector/AVC rectifiers and high-mu amplifiers for DC radios, with the diode located at the negative end of the filament completely independant of the triode section, these tubes are glass-etched 1LH4, and printed in yellow PHILCO REG. U.S. PAT. OFF. LOKTAL MADE IN U.S.A. WHEN REPLACING INSIST ON A GENUINE PHILCO TUBE. Boxes are white printed on end in red PHILCO 1LH4 MADE IN U.S.A.

Condition

Tube Matching
Tube Matching
6.00 USD by tube

WHY ?

A tube may have one, two, or three internal sections depending on the purpose of the tube; somtimes these sections are all the same, sometimes they are different. Due to manufacturing and material tolerances, there may be slight differences between the original specification and the actual tube. Tube matching tests each one of these internal sections and selects tubes, compared to original specifications at manufacture, for balanced performance and good sound.

HOW ?

All our tubes are tested by us prior to packing on our Stark, AVO, Simpson or RF Laboratories Inc. calibrated testers. On request for tube matching, tubes are matched for Mutual Conductance in Micromhos and Plate Current in Milliamps on our Amplitrex or Radioelec Duovac testers, with results printed for each  individual tube. Certain tubes difficult to test are matched for Mutual Conductance in Micromhos only on one of our regular calibrated testers. On request we can also test for Microphonics.

Quantity

Philco
37 Items

Data sheet

Base
8 pin Loctal
Boite type
1/2
Emplacement
02
Quide
252
Fonction
Diode triode
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