RCA 48 – SINGLE POWER TETRODE TUBE (1 PC)
Made in USA
Black Plate
Inverted Cup Getter
Black Base
Power Amplifier Tetrode Type 48
New in White Box
AVO Type 160 Tested
Up for sale is a single (1 pc) vintage NOS RCA 48 power amplifier tetrode vacuum tube, supplied in an individual white box. Made in the USA by RCA, this classic vintage power valve features heavy black plates, a Inverted cup getter, a sturdy black base, and a large ST shoulder glass envelope. Renowned for robust current delivery, exceptional reliability, and rich audio output in vintage radio receivers and power supply circuits.
This tube has been tested on an AVO Type 160 precision laboratory tube tester. Measured Anode Current (Ia in mA) and Mutual Conductance / Transconductance (mA/V) alongside percentage performance ratings relative to nominal factory reference specifications (Reference: 52 mA / 3.8 mA/V) are detailed in the table below.
| Serial No. | Tube Section | Anode Current (Ia) | Transconductance (mA/V) | ||||
|---|---|---|---|---|---|---|---|
| Ref Spec | Result | % Ia | Ref Spec | Result | % mA/V | ||
| S/R.NO.5489001 | Single Power Tetrode | 52 mA | 88.5 mA | 170% | 3.8 mA/V | 4.6 mA/V | 121% |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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