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Post by angelodp on May 11, 2009 0:58:14 GMT -5
I am working on my approach for a 5E3 build. I know that there are lots of layouts out there. I am wondering about the best approach for grounding this circuit. My inclination is to go with a star ground for all but the AC power and power transformer. Any thoughts on this.
ange
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Post by sumgai on May 11, 2009 2:12:41 GMT -5
ange, Actually, there is only one layout.... that works. The rest of them have some kind of shortcoming, which means that you'll end up going back to what Leo found worked best, after about 500 iterations. I presume you've seen these, but just in case: www.ampwares.com/schematics/deluxe_5e3.pdfwww.ampwares.com/amp.asp?id=56There are other pictures of the insides of this amp, in various places around the 'net, I just grabbed the first one linked by Google. HTH sumgai |
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Post by angelodp on May 18, 2009 20:42:58 GMT -5
Thank you sumgai, I have been scouring the net and have many many pics, data and layouts. I have also heard an original old Deluxe 5E3 and its a noisy amp, has no grounded plug, but the tone is just great. So why not alter the ground approach to get better safety and lower noise floor. The heaters were also done to chassis ground and most builds now use dual heater wires.
ange
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Post by sumgai on May 19, 2009 12:01:36 GMT -5
Ah, so now you're going for the less-humming noise, and not the less-harmonic-screeching noise.... OK, I see that now. Yes, you can do what you just described, that will work to some degree. Not a total reduction to zero, but noticible nonetheless. Me, I'd do what you suggest, and then go the extra few yards and put DC on the heaters. That knocks down the hum another few dB, all by itself. Coupled with your other mods, the difference can be very nice.  Remember, in those days (what, 50 years ago, maybe 55?  ), hum was assumed to be the norm, not an aberration. Undesired, but the prevailng thought was that it was too expensive to get around, and since very few players were complaining loudly enough, it was left as you see it now, so many decades later. Thankfully, engineering advances over the years has made it possible to do something about this particular irritation, without breaking the bank.  HTH sumgai |
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), hum was assumed to be the norm, not an aberration. Undesired, but the prevailng thought was that it was too expensive to get around, and since very few players were complaining loudly enough, it was left as you see it now, so many decades later. Thankfully, engineering advances over the years has made it possible to do something about this particular irritation, without breaking the bank. 