I’ve been working on repairing a fantastic L3-3 valve tester. It arrived safely, albeit not working the anode regulation circuit. I replaced the pots for either 10T (for grid regulation) and the screen and anode pots (1M). The regulation of the anode isn’t working, so after some time of a frustrating troubleshooting, I decided to open a nice Ale and listen to Herbie Hancock on LP. Happy Friday!
http://www.jogis-roehrenbude.de/Roehren-Geschichtliches/Roe-Pruefer/L3-3/L3_3.htm
First of all it is necessary to check the lamps 6p1p and zener diodes in the stabilizers
If that I have a repair manual but in Russian
kszd
Hi there,
Yes, I’m familiarised with that webpage. I’ve been translating somehow the material from Russian and/or German to English.
Either way, made some progress, but got stuck again. I’m close to give up, it’s far too much work!
See here:
http://www.diyaudio.com/forums/equipment-tools/107221-russian-l3-3-tube-tester-19.html#post5052641
cheers
Ale
Even new tester when they lie 5-10-15 years have the following problems
Oxidation of connectors and switches
Drying of capacitors against time
Most likely to begin with you need to clean all the switches and connectors in the bathtub and you can manually also have to shoot completely
Maybe the meter is used not native
This should be m906
And it is obligatory with native stamps on screws-
– he should not have been disassembled
http://audioportal.hi-fi.ru/showthread.php/22603-Ремонт-Л1-3-Л3-3
Yes, I knew the amount of work required to restore one hence I wanted to buy one in working condition. That was not the case in fact the seller claimed it was in operational condition. I’ve got some refund back, but not enough to get this fixed by someone else probably. I don’t have the time (or the space in my workshop to work patiently on this tester for a long time).
I will have to desoldered the rotary switches and clean them properly. Do you know best way of cleaning them?
Probably best to keep this conversation via email so other subscribers don’t get annoyed with the emails on this specific topic.
My email is “valves at bartola.co.uk”. If you can please ping me an email would be great.
The meter is labelled “M24-87 11300” you can see it on the bottom left corner
http://www.bartola.co.uk/valves/wp-content/uploads/2017/04/L33-mogliaa-Ia-issue.jpg
thanks
Ale