skankdelvar Posted July 25, 2011 Share Posted July 25, 2011 (edited) Ghastly to bring it up on a bass forum, I know. But I keep blowing up 12AT7's in the reverb socket of an old Silverface Pro Reverb (Ed Jahns UL transformer / MV type). Before I hoick the offending Fender off to a solder-covered gnome bloody miles away, does anyone have any recommendations for a seriously heavy duty 12AT7? That way, if it blows, I'll know it's probably a fault rather than crappy tubes. Thanks in anticipation. Edited July 25, 2011 by skankdelvar Quote Link to comment Share on other sites More sharing options...
brensabre79 Posted July 26, 2011 Share Posted July 26, 2011 If there is a fault it could blow even the most hardy tube - check out watford valves though they give pretty good advice on their site as to how fragile or not the different tubes are. instinct says get something russian Quote Link to comment Share on other sites More sharing options...
skankdelvar Posted July 27, 2011 Author Share Posted July 27, 2011 Thank you brensabre. Any more for anymore? Quote Link to comment Share on other sites More sharing options...
Mr. Foxen Posted July 27, 2011 Share Posted July 27, 2011 Know how to work a multimeter? [url="http://www.hobby-hour.com/electronics/resistorcalculator.php"]Usning this handy resistor calculator[/url] you can test the resistors relating to that valve are in spec, in case they are the issue. Quote Link to comment Share on other sites More sharing options...
Subthumper Posted August 2, 2011 Share Posted August 2, 2011 If it keeps blowing the valves then I'd recomend getting the reverb transformer checked out along with the reverb tank. There could be a breakdown in the windings causing a short that is too much of a load on the driver valve. The circuit is basically a single ended amp that drives the reverb springline and will have the same effect on the valve as a bad speaker load on an amp. Best get these checked by a tech than keep throwing valves at it. Good luck Cheers Just Quote Link to comment Share on other sites More sharing options...
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