B9A plug - UK Vintage Radio Repair and Restoration Discussion Forum

aureus12 · 17th Nov 2019, 12:38 pm

I'm refurbishing the mobile PSU for my Codar AT5 and need a couple of B9A plugs to make up the cable between PSU and transmitter. Could anyone point me to a possible source? I've tried the usual - Google, eBay - with no luck.
Thanks

Phil
G3UGK

Cobaltblue · 17th Nov 2019, 1:24 pm

Hi Phil

You mean these ?

https://www.ebay.co.uk/itm/Vintage-C...sAAOSwJT9cpLFU

Cheers

Mike T

David G4EBT · 17th Nov 2019, 1:52 pm

Five unused ones available here too:

https://www.ebay.co.uk/itm/Vintage-9....c100005.m1851

Incidentally, the AT5 9-pin power supply socket arrangement poses a hazard to the unwary, in that the male plug is fitted on the lead from the power supply to the transmitter and plugs into a female socket on the rear of the transmitter. From a safety perspective, it ought to have been the other way around, because the male plug from the PSU is live with HT and is only safe when plugged into the transmitter.

Of course, CODAR assumed that users of the equipment would be alert this hazard and would take precautions. However, in the admittedly unlikely event that the plug came out of the TX socket with the PSU switched on, and came into contact with anything metallic or a finger, there could be undesirable consequences. I had an AT5 for a while, and was unimpressed with the single pole slide switches switching mains and HT.

Very poor - even by the standards of the day. Woeful by today's standards.

But now - as back then - with all such equipment, it's a case of 'ride at your own risk'.

aureus12 · 17th Nov 2019, 3:20 pm

Thanks Mike. Well spotted. I only searched for "B9A" so they didn't show up...

David, yes I'm well aware of the pitfalls and like you was never impressed with some aspects of the design. However, the little Codar was my very first ever transmitter when I got my licence in 1965, and now I'm on a nostalgia trip.

Thankls both, again

Phil
G3UGK

17th Nov 2019, 12:38 pm	#1
aureus12 Diode Join Date: Nov 2019 Location: Bournemouth, Dorset, UK. Posts: 2	B9A plug I'm refurbishing the mobile PSU for my Codar AT5 and need a couple of B9A plugs to make up the cable between PSU and transmitter. Could anyone point me to a possible source? I've tried the usual - Google, eBay - with no luck. Thanks Phil G3UGK

17th Nov 2019, 1:24 pm	#2
Cobaltblue Moderator Join Date: Dec 2010 Location: Exeter and Poole, UK. Posts: 4,490	Re: B9A plug Hi Phil You mean these ? https://www.ebay.co.uk/itm/Vintage-C...sAAOSwJT9cpLFU Cheers Mike T __________________ Don't care if it was a bargain why's it in my kitchen Mike T BVWS member. www.cossor.co.uk

17th Nov 2019, 1:52 pm	#3
David G4EBT Dekatron Join Date: Feb 2003 Location: Cottingham, East Yorkshire, UK. Posts: 4,339	Re: B9A plug Five unused ones available here too: https://www.ebay.co.uk/itm/Vintage-9....c100005.m1851 Incidentally, the AT5 9-pin power supply socket arrangement poses a hazard to the unwary, in that the male plug is fitted on the lead from the power supply to the transmitter and plugs into a female socket on the rear of the transmitter. From a safety perspective, it ought to have been the other way around, because the male plug from the PSU is live with HT and is only safe when plugged into the transmitter. Of course, CODAR assumed that users of the equipment would be alert this hazard and would take precautions. However, in the admittedly unlikely event that the plug came out of the TX socket with the PSU switched on, and came into contact with anything metallic or a finger, there could be undesirable consequences. I had an AT5 for a while, and was unimpressed with the single pole slide switches switching mains and HT. Very poor - even by the standards of the day. Woeful by today's standards. But now - as back then - with all such equipment, it's a case of 'ride at your own risk'. __________________ David. BVWS Member. G-QRP Club member 1339.

17th Nov 2019, 3:20 pm	#4
aureus12 Diode Join Date: Nov 2019 Location: Bournemouth, Dorset, UK. Posts: 2	Re: B9A plug Thanks Mike. Well spotted. I only searched for "B9A" so they didn't show up... David, yes I'm well aware of the pitfalls and like you was never impressed with some aspects of the design. However, the little Codar was my very first ever transmitter when I got my licence in 1965, and now I'm on a nostalgia trip. Thankls both, again Phil G3UGK