Sorry I disagree, I have met with many with thermal fuses if not to say most of them. One I'm thinking of at the moment was of a high end Technics Arranger (now operating no more) that was still new at the showroom brought to me dead. In some tropical countries they do go o/c because of insufficient ventilation not like other much colder countries.I'm not into transformers as I give them to my winder for repair but could be thermal fuses in them are for safety reasons stipulated by law.
H9000
This is misleading very few transformers have built in thermal fuses!
Regards
Brian G3OYU
From: vintagesynthrepair@yahoogroups.com [mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of HAL9000
Sent: 01 June 2011 8:21
To: vintagesynthrepair@yahoogroups.com
Subject: Re: [vintages ynthrepair] Re: Crumart Trilogy replacement power transformer
I check the transformer's primary using a self-made (lopt) inductance tester running at 19KHz. The primary could have shorted turns due to overheating etc., althought usually there is a thermal fuse incorporated inside the transformer as protection that goes o/c. If it blows the main fuse (verify if this is correct) with the secondary disconnected then it is surely bad.
H9000
The psu board could be faulty but I haven't even got that far. Right now just having the transformer connected to the and power switch (with the rest of the synth disconnected) still blows the fuse. The primary checked out. The secondary show something like 3.5 megaohms. That was it. There may very well be more damage further on but as I said, I haven't got that far yet.