Baxter Posted August 12, 2013 Share Posted August 12, 2013 Im selling an old roost combo guitar amp. Now its got two working mullard el34s in it. Do I keep these and swap them with the electro harmonix ones in my Selmer tnb before it goes. Obviously Ive not advertised the roost as having these valves in it. Quote Link to comment Share on other sites More sharing options...
franzbassist Posted August 12, 2013 Share Posted August 12, 2013 Why not sell it with the EH ones fitted and offer the Mullards as an "upgrade" for £x extra? Unless you plan on keeping the Mullards for something else? Quote Link to comment Share on other sites More sharing options...
Mr. Foxen Posted August 12, 2013 Share Posted August 12, 2013 Can you bias it to suit the other valves? Can you test the mullards? Quote Link to comment Share on other sites More sharing options...
spaners Posted August 12, 2013 Share Posted August 12, 2013 [u]dose it sound any different with the mullards in there ? [/u] Quote Link to comment Share on other sites More sharing options...
Mr. Foxen Posted August 12, 2013 Share Posted August 12, 2013 [quote name='spaners' timestamp='1376331343' post='2172301'] [u]dose it sound any different with the mullards in there ? [/u] [/quote] It will do if it isn't bias right for the other set. Or if any of them are clapped out. Quote Link to comment Share on other sites More sharing options...
Baxter Posted August 13, 2013 Author Share Posted August 13, 2013 the valves in both amps all seem to be working fine. is it a bad idea just to swap the valves over Mr Foxen? Quote Link to comment Share on other sites More sharing options...
Mr. Foxen Posted August 14, 2013 Share Posted August 14, 2013 Plain swapping power valves sort of works, but the bias won't be set right, which compromises sound or valve life. Quote Link to comment Share on other sites More sharing options...
Conan Posted August 14, 2013 Share Posted August 14, 2013 How does one go about biasing valves? Quote Link to comment Share on other sites More sharing options...
paul_5 Posted August 14, 2013 Share Posted August 14, 2013 very, very carefully. Best leave it to someone who knows... Quote Link to comment Share on other sites More sharing options...
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