CV Transistors are UK military spec valves, transistors and diodes (CV stands for common valve, as it predates semiconductors). CV transistors were made by several different manufacturers on contract and produced to the UK military's specifications. These can be, and quite often are, common commercial transistors made to military specification and renumbered.
Here are a few pedal-friendly transistors with well-known counterparts. I may expand on this if I find more information.
Like most things, I am by no means an expert - this is primarily for my own purposes, so please don't get too mad at me if you're a CV transistor expert and I have somehow misinterpreted something or made a mistake. That being said, do feel free to leave me a comment. This guy is an expert if you are interested in more information.
CV TRANSISTOR CODES
The codes can vary, and this is not a definitive collection of every possible code and variation - but here's a very loose and abridged guide.
Usually, there will be three parts. Specification, designation, date.
Hypothetical example: A Mullard OC45 made to the K1001 specification for the UK in the first week of 1969 might have a code that looks something like this.
CV5105
CV TRANSISTOR SPECIFICATION CODE
There are two parts, the first for the specification, the second being the manufacturer (see the next heading re factory codes).
KB/XX
First letter
K Specification K1001 or K1006
J JAN or MIL-spec
Second letter
B UK authority
U US qualification
D Australian
X Director of Electronics Research and Development
FACTORY CODES
Mullard D, DA, DB, DC, DE, DF
Valvo DP
Newmarket CO
STC F, FB, FC, FD, FDA, FE, FF
DATE CODE
Usually made up of four numbers, the first two being the year, the second two being the week of manufacture. example: 6901 is the first week of 1969.
GERMANIUM CV TRANSISTOR EQUIVALENTS
CV2389 OC71
CV2400 OC71
CV5105 OC45
CV5337 OC73
CV5416 OC84
CV5439 OC75
CV5457 OC70
CV5710 OC44
CV5711 OC77
CV5712 OC71
CV5713 OC72
CV5813 OC123
CV7002 OC72
CV7003 OC44
CV7004 OC45
CV7005 OC71 (tin cans sound the same as NKT275, analogman)
CV7006 OC72
CV7007 OC77
CV7111 OC139
CV7112 OC140
CV8314 OC76
CV8315 OC44
CV8316 OC45
CV8344 OC71
CV8435 OC140
CV8346 OC77
CV8389 OC71
CV8440 OC72
CV8724 OC83
CV8756 OC122
CV8966 OC139
CV9259 OC83
CV9447 OC77
CV9778 AC127
CV9779 AC128
CV9927 OC71 (advanced spec)
CV9928 OC44 (advanced spec)
CV9797 OC83 m.pr
CV10061 OC141
CV10675 AC176
CV10809 OC71
NEWMARKET
CV5445 NKT203
CV8559 NKT223
CV8765 NKT213
CV8794 NTK226
CV9190 NKT271
CV9372 NTK218
CV10855 NKT228
CV11170 NKT216
CV11175 NKT210
TEXAS INSTRUMENTS
CV7376 ACY17
CV7002 2G382 (also equivalent to OC72)
CV10164 2G387
CV10394 2G382
GET
CV7009 GET110
CV8607 GET113
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