Members benecol Posted August 2, 2006 Members Share Posted August 2, 2006 Hello - I've got an LC15, and am looking at upgrading the speaker to a Jensen, and sticking all new Harma valves in it to replace the Sovteks that have been in there for the last 5 years (see link below...) http://www.watfordvalves.com/product_detail.asp?id=1436 Now, while it's a different brand of valves, they're the same type, right? Do I need to get the amp re-biased? People have been muttering at me about oscilloscopes - do I need to do this? My local (extortionate - welcome to the UK) guitar shop has quoted me Link to comment Share on other sites More sharing options...
Members potaetoes Posted August 2, 2006 Members Share Posted August 2, 2006 no bias adjustment needed. plug and play. Link to comment Share on other sites More sharing options...
Members benecol Posted August 2, 2006 Author Members Share Posted August 2, 2006 OK, I've had two replies: the post above and a PM (thanks to both, by the way). One says just plug and play, the other says it needs rebiasing. Anyone else care to chip in? Also, does Link to comment Share on other sites More sharing options...
Members potaetoes Posted August 2, 2006 Members Share Posted August 2, 2006 cathode biased EL84s don't need bias adjustment. in fact, such amps don't have adjustable bias. they can hook it up to a scope and charge you Link to comment Share on other sites More sharing options...
Members 496dart Posted August 2, 2006 Members Share Posted August 2, 2006 agreed--dont worry about the bias . Link to comment Share on other sites More sharing options...
Members benecol Posted August 2, 2006 Author Members Share Posted August 2, 2006 Thanks to all - much appreciated. Link to comment Share on other sites More sharing options...
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