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May be a 6 volt Western Electric 310A and a direct drop in for a WE 428A
Tested 750 on Hickok 752A, where minimum is 375. Made in USA.
TUNG-SOL Type 1603 NOS Vacuum Tube
- Product Code: TUNG-SOL NOS Type 1603 Vacuum Tube
- Availability: 1
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$129.99 USD
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Tags: TUNG-SOL, Type 1603, Vacuum Tube