CV Register of Electronic Valves

CV Register of Electronic Valves (including semiconductor devices) 1963, Amendment 14 (May 1971)

CV titles - page by page (PDF).

1. The first column is the CV number in numerical order
2. The second column gives the prototypes and possible substitutes. It should not be assumed they are identical with the CV type. In the case of a valve with COM entered in the third column, and where more than one valve is listed, the name in italics is the valve that the CV number was assigned to.
3. The third column lists the authorities responsible for the preparation of the specifications of the valve:
   • AD - Admiralty Surface Weapons Establishment
   • MOA - Ministry of Aviation, RAE, RRE, and SRDE
   • SH - UK Atomic Energy Authority, AERE
   • WO - War Office
   • GPO - General Post Office (BT now)
   • JAN, MIL - USA JAN1A and MIL-E-1B
   • COM - No specification issued (contact the manufacturer)
4. The fourth column gives the valve's functional type

Type designation to CV titles (Commercial to CV xref)

Old stores ref number to CV titles (old numbers to CV; ZA, 10E, 110E etc)

Joint Service Catalogue numbers

Introduction

The UK NATO Stock Number is obtained by formula for many CV valves for which CV numbers were allocated prior to 1961. Valves to which CV numbers have been allocated after this date have Stock Numbers which bear no relation to the CV number.

"No NATO Stock No. has been allotted" means that the device is of UK origin but no stock number has been allotted as it had not been used for military purposes. "No UK NATO Stock No. has been allotted" means that the device is of other than UK origin. A stock number from another Issuing Authority may be in existence.

Change in NATO Stock Number Class Codes

All thermionic valves and semiconductor devices for military purposes have been allotted a NATO Stock Number in the Class Code 5960. Integrated circuits have been allotted 5999, but from January 1967, the three classes of devices were segregated as follows:

• Thermionic valves: 5960
• Semiconductor devices: 5961
• Integrated circuits: 5962

The list of NATO Stock Numbers against CV Numbers shown here has been ammended to include the new Class Code. Where an NSN is found by formula, refer to the CV register to find the class of device from the Description column. For example, CV123 is classed as a valve so the Class Code is 5960; CV351 is a semi-conductor so the Class Code is 5961.

List of CV Numbers to which the UK NSN is obtained by formula

The formula applies to the following CV numbers:

• CV1 to CV4099 inclusive
• CV4501 to CV4520 inclusive
• CV5001 to CV5175 inclusive
• CV6008

The Stock number is obtained by taking the number part of the CV number and prefixing this with the Class Code 5960, the UK National Code 99, and padding the part number to 7 digits. Thus, CV123 becomes 5960-99-000-0123.

Exceptions to the above are as follows:

CV number to NSN

NSN to CV number

NSN table scans provided by Harvey Edwards