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| Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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5th Mar 2024, 5:38 pm
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#1 |
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Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,290
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CV9507 Transistor. Equivalent?
I found a couple of these in my junk box. Both test good as silicon PNP types.
Anyone know of a "civilian" equivalent? Nothing in "Towers".
__________________
Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
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5th Mar 2024, 5:47 pm
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#2 |
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Heptode
Join Date: Oct 2019
Location: Täby, Sweden
Posts: 710
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Re: CV9507 Transistor. Equivalent?
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5th Mar 2024, 6:27 pm
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#3 |
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Octode
Join Date: Jul 2009
Location: Cheshire, UK.
Posts: 1,740
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Re: CV9507 Transistor. Equivalent?
The CV list PDFs have a blank for CV9507; http://web.archive.org/web/202208190...425-cv9514.pdf
Seems the CV PDFs are only accessible on the web archive now. David |
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5th Mar 2024, 6:40 pm
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#4 |
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Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 28,008
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Re: CV9507 Transistor. Equivalent?
Looks as if there isn't a direct commercial equivalent. Maybe it was hand selected for a particular military contract, though the characteristics don't indicate anything special.
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6th Mar 2024, 9:07 am
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#5 |
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Banned
Join Date: May 2017
Location: Konongo, Ghana
Posts: 516
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Re: CV9507 Transistor. Equivalent?
The CV9507 and BFX30 seem to be very close in characteristics. Somewhat less close is the 2N2904.
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7th Mar 2024, 11:55 am
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#6 |
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Hexode
Join Date: Mar 2009
Location: Cirencester, Gloucestershire, UK.
Posts: 391
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Re: CV9507 Transistor. Equivalent?
Hello All
I recall the CV9507 (and its NPN complement the CV10253) from when I worked at Plessey Telecoms in Liverpool in the mid-1970s. The two types were Post Office approved and possibly used in their TXE-series of exchanges. By the 1970s, they weren't used very much in anger, and the storeman would let them go to we young engineers for building into 'foreigner/homer' audio amps, etc. I still have a good stock myself, just waiting for the right project. Ah, the good old days ... best regards ... Stef |
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7th Mar 2024, 12:32 pm
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#7 |
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Moderator
Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
Posts: 21,290
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Re: CV9507 Transistor. Equivalent?
Thanks everyone.
saddlestone-man seems to have nailed down their origin which is confirmed by this thread which I've just found:- https://www.vintage-radio.net/forum/...d.php?t=164282 These transistors came form the estate of a late BT employee. The fact their leads have been cut short and insulated suggests they've been removed from circuit boards. They do test god though.
__________________
Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
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