Is it possible (or impossible) that the amp may have been made for Lafayette by Gibson? I seem to recall a late Gibson guitar amp that used a couple of 6N6s in pushpull, a 6N7, 6C5 and etc. We used a higher level line input that was connected to the amplifier after the mike preamp, and had all kind of trouble until we learned about unloaded microphone inputs. See if it stays quiet then.įrom my radio days, I remember some reel-to-reel tape machines that had a microphone input and preamplifier that would make all kind of noise if the mike jack wasn't loaded or shorted. Ground the input to its own ground point. This may have had a shorting plug for when Mic not in use. ::Anytime there is an open input it will pick up hum and almost anything else. So I'm going to leave it as it is for now. I still hear a tiny bit of something with all volumes all the way down to zero,but it's very faint. The hiss gets louder as I turn up the volume and decreases as I turn it down. : when I put the bottom cover on the amplifier, when I turn up the mic volume it just hisses loudly. : That could be that it had a shorting plug. There's no schematic available for this late 30s amplifier anywhere I can find. That will take care of the shielding problem, but what's usually the problem if there's no low frequencies. Maybe it needs that small capacitor that connects to the line cord. All the shielding seems good yet it's picking up something. : Now that I have all the paper and electrolytic capacitors replaced, I notice that there are pretty much, no low frequencies and even when the volume controls are turned all the way down, there's still something being picked up. If I turn up that volume it will whistle pretty loud, with nothing connected to it and the bottom cover off. That mike input section is really sensitive. I'll check things over one last time and then give up because it works fine. I remember from a problem I had with a radio that sometimes the rivets that attach sockets, which use a terminal connected to them sometimes have a poor connection, maybe due to age. I also added the line cord capacitor and it helped a bit, but there's still a little pick-up from something. The old speaker I was using to test the amplifier was pretty bad sounding. 'An invaluable source for those studying the political, social and educational history of the past half century.I tried a 2-Way HiFi speaker and voila, the sound is fantastic from this amplifier. Six years in the making, with the close collaboration of its subject, it presents his work in its various contemporary contexts, which incidentally will make the book an invaluable source for those studying the political, social and educational history of the past half century.' - Peter Cox, Times Higher Education Supplement 'Asa Briggs has done us a great service with this densly written biography. 'Immortalises the achievements of a figure without whose creative ideas we might never have had either the Consumers' Association or the Open University.' - The Sunday Times '.a stimulating introduction to a major British cultural figure.' - Choice That is, it will be of great value to historians of the postwar Labour government, the development of academic sociology and the rise of the social sciences, education policy, orgainized consumerism and consumer politics, and notions of social democracy.' - Matthew Hilton, The Economic History Review 'That Briggs is able to draw out the main aspects of Young's politics from such a diverse life is the book's main achievement.This is a long overdue biography and its importance is indicated in the range of scholars who will find it useful.
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