On Tue, 04 May 2004 15:25:18 +0100, Paul Burridge
wrote:

BTW, I've just posted you the photo of the Sig gen. Took a bit longer
than I meant to as I've been faffing about with photo software trying
to enhance the image. Taking flash photos of shiny, black objects is
pretty tricky, I've discovered...
--

Hello Paul,
I received the picture, thanks.
Those connectors are still easy to come by.
Here is a picture of a different sig gen but with a similar
style connector to yours.
http://www.thevalvepage.com/testeq/t.../1632/1632.htm
That connector is a Pye connector.

Your connector is very similar but just slightly different.
When you contact AVO at Dover, ask them the name
of the RF connector that was used. Telling them it is
similar to a Pye should jog their memories.

If you are a purist
and you want to keep the original RF output connector then
you can find some at Ham radio trash and treasure field days
or if you are in a hurry, check out some radio service workshops,
like taxi two-way radio repair joints. Most technicians are horders
of old stuff. They might have an old lead with connector.

If you are not a purist
in keeping old gear original but only functional, open the unit
up and see if the old fashioned RF output connector can be
replaced with a BNC connector easily.

You still haven't told me what ohm meter readings you got
when you placed the meter prods from inner to outer on the
RF connector. (sig gen switched off)
Flick the attenuator switches to all positions. You are looking
for fairly consistent readings to check if the attenuator has
been damaged by a transceiver that transmitted accidentally
or the attenuator having being connected to a high DC voltage.

Tell us. Were the readings close to 50, 75 ohms or what?

Here in Sydney the Wireless Institute of Australia, a kind
of head office for hams keeps old manuals and circuits.
There would be an equivalent office for UK hams in London
with a library of old manuals for sure. Some UK hams
on this group will tell you who to contact.

You can still get those RF connectors and if you try hard
you will find a manual for the AVO CT378B.
Do the obvious first, phone or e-mail AVO.

"The Megger office in Dover
Archcliffe Road, Dover, Kent, CT17 9EN, England."
http://www.avointl.com/common/images/DoverMap.gif
The phone number is on this map.

There you are, they are a couple of hours down the road
from you. Nearly next door. Call in with your sig gen and
ask for a photo copy of the circuit, they will probably chuck
all sorts of stuff at you. :-)

Regards,
John Crighton
Sydney