AVO CT-160

alejo · 13th July 2006, 01:43 PM

Hello, I´n very very happy !!!!!

I find one AVO CT-160 in very good conditions, without rayons nor dust, all clean.
But the main power plug cord is missing. I search info in web, the plug is plessey 3 pin (type F) iden use in military UK equipament, and in radio Racal R17.
I try find it but dont lucky, ....,.

EC8010 I see you live in UK and you use one AVO CT160, please if you want to write. email is

Email address removed to avoid SPAM. EC8010

Family_Dog · 13th July 2006, 04:06 PM

Congratulations on your Ct-160!

I also have one, but it has definitely seen better days. The Meter was not working and the Set Neg Grid Bias pot is open circuit, apparently a very common fault on these portable units and of course new pots are unobtainable. Is your CT-160 working correctly otherwise?

My unit is also missing the mains cord and I had to hard wire a length of cabtyre cable in for an AC mains cable.

I think there is a schematic and further notes for this unit on the Duncsan's web site.

alejo · 13th July 2006, 04:13 PM

Yes, all in it work ok. I use mini cocodrile lead for connect to wall.

alejo · 13th July 2006, 07:08 PM

Family_Dog see here for your grid pot:

http://www.vintage-radio.net/forum/s...ad.php?p=22507

Family_Dog · 13th July 2006, 07:26 PM

Yep, I had seen that before. Crowthorne Tubes in England also has a replacemnet kit for the pot as I recall, as well as for the Meter Movement. Very helpful fellow!

In the meantime I was lucky to find an AVO 4, and then another, and even yet another... as well as an AVO 3 that could probably be fixed.

I had to strip the CT-160 meter out for one of the AVO 4 testers, while the latest one I was fortunate in obtainiong is in just about mint condition.

EC8010 · 13th July 2006, 07:52 PM

alejo: I'll email you, but I've removed the address from your post to avoid you being deluged by SPAM.

alejo · 14th July 2006, 01:08 PM

thanks for replys,

I see for news connectors, more safe, IEC Plug an others...

in nexts days I promise photos.

316a · 14th July 2006, 11:31 PM

Hi ,
If you can't find the correct cable , remove the socket and fit either a similar shrouded socket or if the mains plugs in your country are small enough to fit with the lid closed , simply solder and tyrap a mains lead in . I fitted an IEC socket to mine . There are a few things that will need checking . The roller switches will probably need a thorough clean . Also there is only one calibration pot inside , if the meter does not reach FSD using the mains taps , this will need to be adjusted . Once the meter can reach FSD , test a valve . During the test , measure with a DVM on the breakout panel between grid and cathode and check this correlates with the setting on the grid pot . Set the current pots to zero then check at various settings up to -45V . Avo used a strange log-lin-log pot which is unobtainable , this can burn out or go out of spec . You may find that at various grid settings the grid volts dial will be way off what is measured , if this is the case then always measure on the breakout panel with a DVM . Hope this helps

cheers

316a

13th July 2006, 01:43 PM	#1
alejo diyAudio Member Join Date: Jun 2004 Location: bs.as.	Avo Ct-160 Hello, I´n very very happy !!!!! I find one AVO CT-160 in very good conditions, without rayons nor dust, all clean. But the main power plug cord is missing. I search info in web, the plug is plessey 3 pin (type F) iden use in military UK equipament, and in radio Racal R17. I try find it but dont lucky, ....,. EC8010 I see you live in UK and you use one AVO CT160, please if you want to write. email is Email address removed to avoid SPAM. EC8010

13th July 2006, 04:06 PM	#2
Family_Dog diyAudio Member Join Date: May 2004 Location: North Western Province of South Africa	Congratulations on your Ct-160! I also have one, but it has definitely seen better days. The Meter was not working and the Set Neg Grid Bias pot is open circuit, apparently a very common fault on these portable units and of course new pots are unobtainable. Is your CT-160 working correctly otherwise? My unit is also missing the mains cord and I had to hard wire a length of cabtyre cable in for an AC mains cable. I think there is a schematic and further notes for this unit on the Duncsan's web site. __________________ Vintage Tube Hobby Group: http://groups.yahoo.com/group/vintage_tube/

13th July 2006, 07:26 PM	#5
Family_Dog diyAudio Member Join Date: May 2004 Location: North Western Province of South Africa	Yep, I had seen that before. Crowthorne Tubes in England also has a replacemnet kit for the pot as I recall, as well as for the Meter Movement. Very helpful fellow! In the meantime I was lucky to find an AVO 4, and then another, and even yet another... as well as an AVO 3 that could probably be fixed. I had to strip the CT-160 meter out for one of the AVO 4 testers, while the latest one I was fortunate in obtainiong is in just about mint condition. __________________ Vintage Tube Hobby Group: http://groups.yahoo.com/group/vintage_tube/

13th July 2006, 07:52 PM	#6
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	alejo: I'll email you, but I've removed the address from your post to avoid you being deluged by SPAM. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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13th July 2006, 04:13 PM	#3
alejo diyAudio Member Join Date: Jun 2004 Location: bs.as.	Yes, all in it work ok. I use mini cocodrile lead for connect to wall.

13th July 2006, 07:08 PM	#4
alejo diyAudio Member Join Date: Jun 2004 Location: bs.as.	Family_Dog see here for your grid pot: http://www.vintage-radio.net/forum/s...ad.php?p=22507

14th July 2006, 01:08 PM	#7
alejo diyAudio Member Join Date: Jun 2004 Location: bs.as.	thanks for replys, I see for news connectors, more safe, IEC Plug an others... in nexts days I promise photos.

14th July 2006, 11:31 PM	#8
316a diyAudio Member Join Date: Dec 2002 Location: West London	Hi , If you can't find the correct cable , remove the socket and fit either a similar shrouded socket or if the mains plugs in your country are small enough to fit with the lid closed , simply solder and tyrap a mains lead in . I fitted an IEC socket to mine . There are a few things that will need checking . The roller switches will probably need a thorough clean . Also there is only one calibration pot inside , if the meter does not reach FSD using the mains taps , this will need to be adjusted . Once the meter can reach FSD , test a valve . During the test , measure with a DVM on the breakout panel between grid and cathode and check this correlates with the setting on the grid pot . Set the current pots to zero then check at various settings up to -45V . Avo used a strange log-lin-log pot which is unobtainable , this can burn out or go out of spec . You may find that at various grid settings the grid volts dial will be way off what is measured , if this is the case then always measure on the breakout panel with a DVM . Hope this helps cheers 316a

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