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Finished building one of these last week...sounded quite decent but tonight it's developed a high pitched tone tonight....any ideas what this could be?
There's nothing like the right tool for the job.And -usually- that's what I end up using.....nothing like the right tool for the job!
Just checked that clip and it's definitely not that...just gone back to the comp...the tone is at about 16-17khz when audio is being passed. When the audio stops a low and noisy oscillating sound creeps in. Bloody annoying....one week of silent operation them this happens!!!
Mine isnt microphonic tube noise make horrible ocillation ...I cant get any decent sound of of it....Ive made lots of vari mu comps never had this much trouble....might leave it couple of days and go over it again.....i build a very similar VK1 that sound great!
Thanks for the advice chaps...I'll try tap testing and swapping tubes first...
had a look at my voltages Im feeding 162v to the junction of the 2x33K res & the 39K...
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