300bpse
Hi everyone I have a pair of 300BPSE’s built when they first came out and lovingly looked after since, one amp has developed a problem over the last year or so which I have lived with but now hoping to fix. On switch on after a few seconds as the 5U4 lights up I get a very loud crackle lasting about a second after that it settles down and all is OK and at switch off. Over the years I have had a number of 5U4’s which have occasionally flashed over but a change of valve has sorted it, have also swapped all the valves which has made no difference. Can anyone help me in a possible cause and what to check - thanks
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14th February 2018, 11:22 AM
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