AVO All-Wave Oscillator - UK Vintage Radio Repair and Restoration Discussion Forum

rsedwards1 · 3rd Apr 2018, 10:14 pm

I just dragged this out of the garden shed , not knowing too much i dismantled the wrong way about and the transformer was hanging about the the smoothing capacitors was loose . Tried this out and it actually works , could do with a new probe lead set but other wise working.

John M0GLN · 4th Apr 2018, 6:18 am

I've got one which I find performs very well for it's age, when I first got it about 25 years ago I took it into work to make a calibration chart using their frequency counter, I threw the chart away when I'd done it as the frequencies measured on the counter were so close to the Avo dial readings.
I presume you have a copy of the Avo instructions for it, if not I can email you a copy.

John

barrymagrec · 4th Apr 2018, 6:41 am

I've got my Dad's which he had from sometime during the war. I replaced the Electrolytics in 1974 and checked it on an HP 5245L - as above, so close to spot on it wasn't true.

rsedwards1 · 4th Apr 2018, 8:15 am

John,

I don't have any instructions so I would welcolm a copy just to know how it works, I will not be using it just as a curiosit . I have some other items in the Shed too, there are two old valve radios and an enormous valve oscilloscope which was working before I stored this in 1990.

A Trio JR-310 communications receiver I tried last night also works, needs a drive belt only and cleaning up. I will put this on the site too.

ronbryan · 4th Apr 2018, 9:27 am

It is interesting that John's AWO has a 'U' shaped brass shield positioned over the open vanes of the tuning capacitor. My unit dated 1944 also has this feature, which I had always assumed was an unofficial modification performed by one of its owners. It looks like it was original after all.

Ron

ms660 · 4th Apr 2018, 10:43 am

Instructions/schematic, Post#2, 1st attachment:

https://www.vintage-radio.net/forum/...ad.php?t=10042

Lawrence.

3rd Apr 2018, 10:14 pm	#1
rsedwards1 Triode Join Date: Dec 2017 Location: Great Yarmouth, Norfolk, UK. Posts: 15	AVO All-Wave Oscillator I just dragged this out of the garden shed , not knowing too much i dismantled the wrong way about and the transformer was hanging about the the smoothing capacitors was loose . Tried this out and it actually works , could do with a new probe lead set but other wise working. Attached Thumbnails Last edited by AC/HL; 3rd Apr 2018 at 10:33 pm. Reason: Rule D4

4th Apr 2018, 6:41 am	#3
barrymagrec Octode Join Date: Dec 2017 Location: Morden, Surrey, UK. Posts: 1,557	Re: AVO All-Wave Oscillator I've got my Dad's which he had from sometime during the war. I replaced the Electrolytics in 1974 and checked it on an HP 5245L - as above, so close to spot on it wasn't true.

4th Apr 2018, 8:15 am	#4
rsedwards1 Triode Join Date: Dec 2017 Location: Great Yarmouth, Norfolk, UK. Posts: 15	Re: AVO All-Wave Oscillator John, I don't have any instructions so I would welcolm a copy just to know how it works, I will not be using it just as a curiosit . I have some other items in the Shed too, there are two old valve radios and an enormous valve oscilloscope which was working before I stored this in 1990. A Trio JR-310 communications receiver I tried last night also works, needs a drive belt only and cleaning up. I will put this on the site too.

4th Apr 2018, 9:27 am	#5
ronbryan Octode Join Date: Jan 2003 Location: Guildford, Surrey, UK. Posts: 1,959	Re: AVO All-Wave Oscillator It is interesting that John's AWO has a 'U' shaped brass shield positioned over the open vanes of the tuning capacitor. My unit dated 1944 also has this feature, which I had always assumed was an unofficial modification performed by one of its owners. It looks like it was original after all. Ron Attached Thumbnails

4th Apr 2018, 10:43 am	#6
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: AVO All-Wave Oscillator Instructions/schematic, Post#2, 1st attachment: https://www.vintage-radio.net/forum/...ad.php?t=10042 Lawrence.

4th Apr 2018, 6:18 am	#2
John M0GLN Octode Join Date: Jan 2004 Location: Southport, Merseyside, UK. Posts: 1,156	Re: AVO All-Wave Oscillator I've got one which I find performs very well for it's age, when I first got it about 25 years ago I took it into work to make a calibration chart using their frequency counter, I threw the chart away when I'd done it as the frequencies measured on the counter were so close to the Avo dial readings. I presume you have a copy of the Avo instructions for it, if not I can email you a copy. John