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National NCL-2000 HF Amplifier K1, K2 & K3 Relay Set Kit Factory New Originals

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MPN:
51416-1, 51416-2, 51416-3
Condition:
New
Shipping:
$10.00 (Fixed Shipping Cost)
  • Vintage Magnecraft relays for National NCL-2000 linear amplifier: K1 DPDT Antenna 88AX-53A 51416-1, K2 SPST NC Overload B51416-3, Plate SPST NO 10A B51416-2. 12VAC coils, tested pulls available. Perfect for ham radio restorations.
  • Vintage Magnecraft relays for National NCL-2000 linear amplifier: K1 DPDT Antenna 88AX-53A 51416-1, K2 SPST NC Overload B51416-3, Plate SPST NO 10A B51416-2. 12VAC coils, tested pulls available. Perfect for ham radio restorations.
  • Vintage Magnecraft relays for National NCL-2000 linear amplifier: K1 DPDT Antenna 88AX-53A 51416-1, K2 SPST NC Overload B51416-3, Plate SPST NO 10A B51416-2. 12VAC coils, tested pulls available. Perfect for ham radio restorations.
  • Vintage Magnecraft relays for National NCL-2000 linear amplifier: K1 DPDT Antenna 88AX-53A 51416-1, K2 SPST NC Overload B51416-3, Plate SPST NO 10A B51416-2. 12VAC coils, tested pulls available. Perfect for ham radio restorations.
$124.99
Frequently bought together:

Description

National NCL-2000 HF Amplifier K1, K2 & K3 Relay Set Kit Factory New Originals

  This is the Complete relay set (Less Time Delay relay)

Relay Details & Typical Specifications (88 Series / Similar Models)
  • K1: Antenna Relay — DPDT (Double Pole Double Throw), 12 VAC coil, Magnecraft 88AX-53A (or close variant like 88AX-52), National Part # B51416-1.
    Typically 10A contact rating, open-frame design with blade terminals, used for RF antenna switching (transmit/receive). Good for moderate RF power handling in ham applications.
     
     
  • K2: Overload Relay — SPST NC (Single Pole Single Throw Normally Closed), National Part # B51416-3 (Magnecraft 88X-151A/B or similar).
    Protects against plate current overload (e.g., ~1A trip in the NCL-2000). Sensitive coil for fast response.
     
     
  • Plate Power Relay — SPST NO (Single Pole Single Throw Normally Open), 10A contacts, 12 VAC coil, National Part # B51416-2 (likely 88 series equivalent).
    Handles switching the high-voltage plate supply.
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