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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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9th Aug 2017, 7:38 am | #1 |
Octode
Join Date: Feb 2007
Location: Ely, Cambridgeshire, UK.
Posts: 1,976
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AVO Test Bridge with EBF2 valve
picked this up at Kings Lynn radio rally at the weekend
most of the stuff including the restoration guide on this site and web seems to be for a latter version. Any one got a circuit for this earlier version looks as if its had work before there are 2 metal can wax caps in parallel and another black body one that has come a drift one end Also the case has a hole in it at top in middle towards the back must be original as the in side has a masked square so I am guess a earth stud ?? any got any info on the stud and a early circuit cheers vince 3rd picture shows cap adrift |
9th Aug 2017, 7:39 am | #2 |
Octode
Join Date: Feb 2007
Location: Ely, Cambridgeshire, UK.
Posts: 1,976
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Re: AVO Test Bridge with EBF2 valve
more internal pictures
second and third picture shows 2 metal cased wax caps in parallel |
9th Aug 2017, 7:40 am | #3 |
Octode
Join Date: Feb 2007
Location: Ely, Cambridgeshire, UK.
Posts: 1,976
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Re: AVO Test Bridge with EBF2 valve
hole in case top
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9th Aug 2017, 8:07 am | #4 |
Octode
Join Date: Dec 2010
Location: St Ives, Cambridgeshire, UK.
Posts: 1,180
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Re: AVO Test Bridge with EBF2 valve
Hi Vince,
I have one with an EBF2 in as well, good to see mine isn't unique. Does the CT8 valve base and bracket look factory to you? If you search back on Avo Test Bridge CT8 valve you'll find some photos of mine and further discussions. Andrew
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9th Aug 2017, 8:25 am | #5 |
Octode
Join Date: Feb 2007
Location: Ely, Cambridgeshire, UK.
Posts: 1,976
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Re: AVO Test Bridge with EBF2 valve
yes all looks original valve wise but I think some off the wax caps have been replaced probably in the 60's
but now need doing again 1 has been replaced by 2 in parallel / 1 is a black hard cased and 3 look original found your thread nice to see another unit does yours have the case hole ?? http://www.vintage-radio.net/forum/s...ad.php?t=94971 mine is dated March 1941 |
9th Aug 2017, 10:30 am | #6 |
Octode
Join Date: Mar 2011
Location: Sheffield, South Yorkshire, UK.
Posts: 1,453
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Re: AVO Test Bridge with EBF2 valve
I suppose that due to wartime shortages AVO could have used whatever valves they could get at the time.
Mine has a brass binding post on the top. I've always wondered if it was original or added by a previous owner so you've settled that question for me. |
9th Aug 2017, 10:49 am | #7 |
Octode
Join Date: Feb 2007
Location: Ely, Cambridgeshire, UK.
Posts: 1,976
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Re: AVO Test Bridge with EBF2 valve
Could you do me a picture of the binding post then I can see if I can find something close to fit to mine (better than a empty hole)
cheers Vince PS I have noticed various AVO meters sometimes had a binding post |