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-   -   How to check output transformers ? (http://www.diyaudio.com/forums/tubes-valves/31807-how-check-output-transformers.html)

00940 7th April 2004 06:38 PM

How to check output transformers ?
 
I've been given a pair of output transformers by a friend. Is there a quite easy way to test them ? I've no oscillope at home, just a dmm. All procedures I found on the web take for granted that the xformers are still on the amp.

They're quite small, coming from a stereo amp with just a pair of EL84. There are four wires coming out of each xformer.


Btw, would someone know from which brand are tubes with this marking ? :

http://www.membres.lycos.fr/sst00940/logo.jpg

fdegrove 7th April 2004 10:32 PM

Hi,

The CV letter code FB is probably STC in Footscray.

KB I see alot on CV valves but I don't know what it stands for.

Cheers,;)

EC8010 7th April 2004 10:51 PM

I'm afraid your output transformers are traditional 3W single-ended transformers and are probably terrible. On the other hand, if you want to experiment and learn, then they are ideal. Try looking at the Mullard 3-3 circuit. The winding with the higher resistance is the primary, and goes between HT and anode. The (much) lower resistance winding is the loudspeaker output (probably 4 Ohm).


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