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Heathkit Ad1013 CRT Dim

gazmono

Junior Member
Joined
Jun 6, 2011
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london
#1
Hi, I have recently bought a Heathkit AD1013 audio-scope from ebay (for £260). I have been waiting for one of these to come up for years and pounced on it. I am going to use it with my sansui QRX-6001 that I bought on a recommendation from mr. Quadrasaurus. The trouble is the display seem quite dim to me. At first I assumed it was just that it needed re-capping, especially as the waveforms wobbled about a bit but I have just finished replacing all the electrolytics and it is still the same. Does anyone have any ideas? I have a circuit diagram which doesn't show any adjustable pre-sets. Do old tubes just decay?
 
Joined
Jun 14, 2005
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Quadsylvania
#4
Not sure if this would work and must be careful but,
just like the old tv's if you can measure or know the filament voltage specs for tube,
add a separate filament transformer about a 1 volt maybe 2 higher(no more).
This might get by for a while whilst you look for another unit or crt replacement.
QC
 

gazmono

Junior Member
Joined
Jun 6, 2011
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london
#5
Thanks to everyone for your comments. I managed to find a relacement 3RP1A CRT @ http://www.sphere.bc.ca/test/crts.html for around £60, which is a better price than the £100 ebay wants. It is good to know there are still stocks of these around. I will let you know wether it looks brighter than the old tube once I have received it.
 

w.a.reid

500 Club - QQ All Star
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Mar 17, 2009
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denton texas
#7
just for the record - i have the ad - 1013 - from a nice guy - d.g.wizard - completely restored by the heathkit master - i have never unboxed it - he sent owner/operator info too - i then - years later bought a very fine example of the ar-1500....the intended mate for the scope....at least in publications and magazine articles and the like. i plugged in the ar-1500 and the right rear side was visibly and olfactibly alarming - and the sound grew worse. i shut it downn and picked up the phone - no answer - turned on the computer....to find the heathkit wizard was dead....as of April.

http://www.heathkitstereo.com/

http://www.ebay.com/usr/dg_wizard?_trksid=p2053788.m1543.l2754

so - im not sure why im posting this, other than to say this is who i was going to for a restore on my ar-1500....

RIP Kevin
 

quadsearcher

700 Club - QQ All Star
Joined
Nov 8, 2010
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#8
Geez, your stories of repair tech horror stories make me want to offer my services, because I think I am honorable. But I could make a mistake. Anyway, I'm still trying to fully understand this Mesa/Boogie Mark 1 combo guitar amp. I fixed the main stuff, but found the outside two outputs run a lot hotter than the inside two. Some things are easier than others to talk about.
 

w.a.reid

500 Club - QQ All Star
Joined
Mar 17, 2009
Messages
502
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0
Location
denton texas
#9
Geez, your stories of repair tech horror stories make me want to offer my services, because I think I am honorable. But I could make a mistake. Anyway, I'm still trying to fully understand this Mesa/Boogie Mark 1 combo guitar amp. I fixed the main stuff, but found the outside two outputs run a lot hotter than the inside two. Some things are easier than others to talk about.
i remember you writing me this...but i kept looking for it in a PM....now i see it.....and will pm you...

w.a.r.