Welcome to Australia's only Vintage Radio and Television discussion forums. You are not logged in. Please log in below, apply for an account or retrieve your password.
Australian Vintage Radio Forums
  Home  ·  About Us  ·  Discussion Forums  ·  Glossary  ·  Outside Links  ·  Policies  ·  Services Directory  ·  Safety Warnings  ·  Tutorials

General Discussion

Forum home - Go back to General discussion

 BWD 503 scope
« Back · 1 · Next »
 Return to top of page · Post #: 1 · Written at 11:31:44 AM on 17 October 2018.
Clockmeister's Gravatar
 Location: Albany, WA
 Member since 20 January 2012
 Member #: 1068
 Postcount: 25

I have a BWD 503 scope that I picked up for peanuts at an auction recently. It's pretty basic but apart from needing a new pot it works OK.
Unfortunately I can't find any information on this particular model online anywhere. I contacted the HRSA and they were not able to find any info on that model either despite best efforts.

So then, has anyone heard, seen or has in their possession a BWD 503 scope and it's schematic and/or user manual?
The PCB is marked 503 as well, so it seems to be specific to this model.

This is the scope here.

http://tinypic.com/r/2ceno0n/9


 
 Return to top of page · Post #: 2 · Written at 12:11:49 PM on 17 October 2018.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6010

Unfortunately I can't find any information on this particular model online anywhere.

Documentation for BWD equipment is in the category of unobtainium. Someone somewhere may have a huge cache of it going mouldy and brown in boxes, but so far he or she has not emerged.

For a once proud Australia brand, whose gear was in TAFEs everywhere, it's a major shame.


 
 Return to top of page · Post #: 3 · Written at 6:22:30 PM on 17 October 2018.
Normf's Gravatar
 Location: Erowal Bay, NSW
 Member since 19 June 2018
 Member #: 2256
 Postcount: 87

Hi Clockmeister
I have a BWD 502 oscilloscope, it looks similar to yours.
I have a manual for in PDF format, its 11.6MB, could email you a copy.
It may be a start for you if that's any help.
Kevin Chant has info on 502 and 504, you can download the 502 manual from his site,
the 504 is circuit diagram.

https://www.kevinchant.com/bwd.html


 
 Return to top of page · Post #: 4 · Written at 6:26:12 PM on 17 October 2018.
Robbbert's avatar
 Location: Sydney, NSW
 Member since 18 September 2015
 Member #: 1801
 Postcount: 1378

Looks exactly like my BWD oscilloscope. I don't have it here, so I can't confirm the model number.

If it is the same, you'll find it has valves for some functions. Mine would stop showing a display after being on for a while, this turned out to be dry joints on the main board.

It also drifts for a time, while it warms up.


 
 Return to top of page · Post #: 5 · Written at 6:51:13 PM on 17 October 2018.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6010

Wow, KC has a heap of BWD doco. Never noticed it. I'm interested to know where he got it all.


 
 Return to top of page · Post #: 6 · Written at 12:28:35 PM on 18 October 2018.
Clockmeister's Gravatar
 Location: Albany, WA
 Member since 20 January 2012
 Member #: 1068
 Postcount: 25

Thanks for your replies. None of the existing schematics on KC's site and elsewhere (like Electrotanya) including the 502 or 504 are close, I've checked. It also does not have any valves, it it's all transistor.

I suspect this might be one of those TAFE or defense models that weren't retailed through regular channels and that is why even the retail catalogue skips the 503.

It's not that I can't work out how to use it as it's pretty basic compared to my DSO but a schematic and manual is always nice to have. As it is one pot failed yesterday but BWD used standard components so repair is pretty simple.
I was told on facebook that someone on the HRSA was a former BWD employee and had all the information on BWD equipment, but the chap at the HRSA that collates circuit diagrams didn't know who that member might be and despite best efforts and to his frustration could not find anything on the 503 either.

I know a bunch of similar if not the same scopes came through the same auction house several months ago and they had documentation. Perhaps I can find out who bought those and see if I can chase up a manual that way. There were probably about ten units and they all went but I have not seen any for sale locally so maybe they still have them. A long shot but if I find anything I'll forward it to K, HRSA, Elektrotanya and anyone here who might be interested.


 
 Return to top of page · Post #: 7 · Written at 12:43:47 PM on 18 October 2018.
Robbbert's avatar
 Location: Sydney, NSW
 Member since 18 September 2015
 Member #: 1801
 Postcount: 1378

Looking at it again, mine is a little different to yours. The power light on mine is smaller, there are more terminals at the bottom right, and there's a control between the 2 slide switches where yours has that black thing.

I'll try to get the model number next week (if you care).


 
 Return to top of page · Post #: 8 · Written at 1:48:05 PM on 18 October 2018.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6010

someone on the HRSA was a former BWD employee and had all the information on BWD equipment

I might try to find out who that is.

I asked KC where he got his BWD files and he replied "more good luck than anything else. I have had people send me data from time to time, anything from a single BWD service sheet through to several manuals in one hit. No single source as such."

Meanwhile, this from Radiomuseum:

QUOTE: BWD Electronics was founded mid-1955 by John Beesley, Peter Wingate and Bob Dewey. The name BWD was derived from the first letter of each of their surnames. There first premises were rented in Auburn Rd, Auburn near the Geebung hotel in 1956. In 1966 BWD employed around 80 people and moved to 333 Burke Road, Gardner and remained there until the building was to be demolished to make way for the South Eastern [Monash] freeway in 1972. They then moved to Miles street in Mulgrave.. In 1977 BWD released the 880 Powerscope, an oscilloscope designed for looking at mains power. That oscilloscope subsequently won an Australian design award. John Beesley remained involved in the company until 1989 when he went to work for Cochlear. BWD Electronics was purchased by McVan Instruments, currently part of the Observator B.V. group of the Netherlands. B.W.D. ELECTRONICS PROPRIETARY LIMITED was first registered on the 21st of July 1955. McVan Instruments, 58 Geddes Street, PO Box 298, Mulgrave, Victoria 3170 AUSTRALIA. Now only producing one instrument currently under the BWD brand name.


 
 Return to top of page · Post #: 9 · Written at 8:44:36 AM on 21 October 2018.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 4337

I have a 539C that also needs a pot. That will be interesting (rather than difficult) as its coupled via a hole drilled in the shaft for a wire link. This one is IC & Transistor & I have the book. Catch 22 is that its a Dual Trace.

Also bought at an auction cheap. I don't think a lot were interested in it, as it was putrid, & took over 2 hours to clean.


 
« Back · 1 · Next »
 You need to be a member to post comments on this forum.

Sign In

Username:
Password:
 Keep me logged in.
Do not tick box on a computer with public access.