Home › Forums › Design and Building › 2 Stroke Amplifier Design and Building › Squeal and hum on 2stroke › Re: Re: Squeal and hum on 2stroke
January 21, 2013 at 12:30 pm
#5759
Robin
Participant
You mean a EL-34 (rather than EL-84), right? I’ve never seen an impedance mismatch make squealing noises. Obviously there is a problem with stability. Assuming V1 (the preamp tube) is not monophonic and causing the problem, I’d still look for a lead dress issue.