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Set of (2) 1N2637 High Voltage, Solid State silicon Rectifiers Replacements for the 866A & 3B28 Vacuum Tube Rectifiers NEW in Boxes P/N 5961-850-3003

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MPN:
5961-850-3003
Condition:
New
Shipping:
$8.00 (Fixed Shipping Cost)
  • Premium Pair of NOS IR 1N2637 Solid State Rectifiers. Upgrade your vintage gear with these New Old Stock International Rectifier 1N2637 units. Direct plug-in replacements for 866A and 3B28 mercury-vapor tubes. Rated at 10.4kV PIV and 750mA. Original factory boxes included. Perfect for Drake, Johnson, and Collins amplifiers. Shop at Nationwide Radio for authentic, high-voltage reliability.
  • Premium Pair of NOS IR 1N2637 Solid State Rectifiers. Upgrade your vintage gear with these New Old Stock International Rectifier 1N2637 units. Direct plug-in replacements for 866A and 3B28 mercury-vapor tubes. Rated at 10.4kV PIV and 750mA. Original factory boxes included. Perfect for Drake, Johnson, and Collins amplifiers. Shop at Nationwide Radio for authentic, high-voltage reliability.
  • Premium Pair of NOS IR 1N2637 Solid State Rectifiers. Upgrade your vintage gear with these New Old Stock International Rectifier 1N2637 units. Direct plug-in replacements for 866A and 3B28 mercury-vapor tubes. Rated at 10.4kV PIV and 750mA. Original factory boxes included. Perfect for Drake, Johnson, and Collins amplifiers. Shop at Nationwide Radio for authentic, high-voltage reliability.
$44.99
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Description

Set of (2) International Rectifier 1N2637 High Voltage, Solid State silicon Rectifiers Replacements for the 866A & 3B28 Tubes NEW in Boxes P/N 5961-850-300

Technical Specifications
Manufactured by International Rectifier (IR), it features a rugged molded assembly with a standard UX4 4-pin base.
 
  • Peak Inverse Voltage (PIV): 10,400V (10.4 kV).
  • Average Forward Current: 750 mA (0.75 Amps).
  • Base Type: Standard UX4 (4-pin) base.
  • Physical Dimensions: Approximately 1-1/4" diameter by 5-1/8" height.
  • National Stock Number (NSN): 5961-850-3003
Primary Benefits
Replacing mercury-vapor tubes with the 1N2637 offers several operational advantages for vintage ham radio gear like the Johnson Viking Valiant or Hallicrafters HT-33.
  • No Filament Power: It eliminates the need for a 2.5V/10A filament supply, significantly reducing the load on the power transformer and lowering internal cabinet heat.
  • Instant On: Requires no warm-up period, whereas mercury-vapor tubes like the 866A require several minutes of pre-heating to vaporize mercury before high voltage is applied.
  • Durability: High resistance to mechanical shock and vibration compared to glass tubes.

 

 

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