Featuring Fine Vintage and Modern Amateur Radio Gear For Sale

Eimac 3-500Z Power Amplifier Tube, 1978 Date Code, in Original Box Tested Full Output S/N V82080

Write a Review
MPN:
3-500Z
Condition:
Used
Shipping:
$18.00 (Fixed Shipping Cost)
  • Eimac 3-500Z Power Amplifier Tube, 1978 Date Code 7837, Tested Full Output, Original Box, Excellent
  • Eimac 3-500Z Power Amplifier Tube, 1978 Date Code 7837, Tested Full Output, Original Box, Excellent
$249.99
Frequently bought together:

Description

Eimac 3-500Z Power Amplifier Tube, 1978 Date Code, in Original Box Tested Full Output
 
 This Tube looks like new. I tested this 3-500Z in an Ameritron AL-80 Amplifier, and it is full emission as compared to a new one.
The Eimac 3-500Z is a classic high-μ power triode vacuum tube designed primarily for zero-bias Class AB2 (or Class B) linear amplifier service in RF applications, especially amateur radio HF amplifiers.
 
frank.pocnet.net
Key Specifications
  • Type: High-mu power triode (amplification factor μ ≈ 130)
  • Filament: 5.0 V ±0.25 V, 14.6 A (thoriated tungsten)
  • Plate Dissipation: 500 W
  • Max Plate Voltage: 4000 V
  • Max Plate Current: ~400 mA (typical operating)
  • Frequency: Usable up to 110 MHz for full ratings
  • Physical: Approx. 6.38" long x 3.56" diameter
  • Common Uses: Popular in amplifiers like the Ameritron AL-80(A/B), Heathkit SB-220, and similar legal-limit or near-legal-limit HF linear amplifiers. It excels in grounded-grid configurations.
     
    n6jv.com
 code 7837 typically indicates manufacture in 1978 (year 78, week 37 or similar Eimac coding).  These older Eimac tubes are highly regarded for build quality and performance compared to many modern imports or later production 3-500Z tubes
 
.
test results (50 W in → 500 W RMS out in an Ameritron AL-80) are solid and consistent with expected performance for this tube in excellent, full output condition. The AL-80 series (single 3-500Z) is typically rated for ~800–1000 W PEP SSB output with proper drive/tuning, and 500–700 W carrier/CW is realistic depending on drive level, line voltage, loading, and frequency. Strong output like yours indicates good emission and health.
 
View AllClose

Related Products