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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment. |
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21st Dec 2009, 11:29 pm | #1 |
Diode
Join Date: Sep 2009
Location: Newport, South Wales, UK.
Posts: 3
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Racal RA17 - Info/advice wanted.
In connection with this thread......
It would be nice if someone had a consolidated, late stage list of the mod state of the Mk II / III sets - and even better, copies of the mod leaflets. I would be very grateful for any advice on that, rather than just the manual and cct diagrams that I have. My first snag - rather than go for a dubious refurbish of the shonky AF / IF gain pots (last resort), does anyone know of a source of NoS Colvern WW pots? Where did they all go to? They were 10 a penny then and we did not want them - we wanted the miniature, Gucci, cermet track jobs that are all you get now. When you want a mans pot for a real job....... bah, don't go there....... Last edited by Darren-UK; 22nd Dec 2009 at 12:40 am. Reason: Condensed down to the point. |
22nd Dec 2009, 2:44 pm | #2 |
Nonode
Join Date: Oct 2008
Location: Warsaw, Poland and Cambridge, UK
Posts: 2,677
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Re: Racal RA17 - Info/advice wanted.
I don't know anything about RA17 mods, but Colvern pots are still available from Farnell as far as I can see. Both the 1W CLR1106 series (small black ones) and 3W CLR4001 series (big ones with the red back) are listed. Their website is offline at the moment but a search for those type codes should dig them up.
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22nd Dec 2009, 7:11 pm | #3 |
Heptode
Join Date: Jan 2008
Location: Birchington Kent, UK.
Posts: 595
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Re: Racal RA17 - Info/advice wanted.
Hi John
There are various RA17 manuals at http://kilocycles.co.uk/uk-commonwealth-rx-tx.html and descriptions of variants at http://www.recelectronics.demon.co.uk/ra17.htm hope this will answer some questions Regards Pete |
8th Jan 2010, 9:03 pm | #4 |
Diode
Join Date: Sep 2009
Location: Newport, South Wales, UK.
Posts: 3
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Re: Racal RA17 - Info/advice wanted.
Belated thanks, chaps.
I was aware of those links, but thank you. Already having a Farnell account, I had searched them for suitable pots. I can't get exactly what I want, but I will get something that will do. John |
5th Jul 2010, 12:19 am | #5 |
Triode
Join Date: Mar 2008
Location: Huddersfield, West Yorkshire, UK.
Posts: 45
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Re: Racal RA17 - Info/advice wanted.
Noisy AF gain pot can be cured by putting 1 meg resistor af amp grid to ground, then feed from pot wiper via 0.1 mf.
Another useful trick , to double audio out is to parallel the two audio o/p valves, simply dis the existing wire to V23 grid. Join V23 grid to pin 1 V22. Then connect a 0.47 mf between the two anodes. |
8th Jul 2010, 2:50 pm | #6 |
Heptode
Join Date: Oct 2007
Location: Birmingham, West Midlands, UK.
Posts: 618
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Re: Racal RA17 - Info/advice wanted.
I can send you a pdf of a manual if you want, just give me your direct email
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