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Old 26th May 2004, 09:34 PM   #11
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Default Re: Great looking Amp...

Quote:
Originally posted by mourip
Did you make the base yourself?
No. I'm not that good at finish carpentry. I had a cabinetmaker that lives nearby make the frame and one for my planned linestage also. Any competent cabinetmaker should be able to build you a frame with dovetail joints on the corners. The cost was only $20.
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Old 26th May 2004, 10:59 PM   #12
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Quote:
That is indeed "Tea for the Tillerman". Good eyes!!
That album is part of the music that is forever a part of my gestalt.

Quote:
This amp has more hum than my first humble project does. Go figure huh?
Indeed. I doubt you're discouraged, and you shouldn't be. As you undoubtedly know, there's plenty of things you can do--resolder joints, adjust the wire paths, use coax for the filament wiring, switch to DC filament power, etc. You'll get rid of it.

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Thank you very much for the compliments.
You deserve them. Thanks for the photos.

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George Ferguson
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Old 27th May 2004, 12:46 AM   #13
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Quote:
Originally posted by DrDeville


use coax for the filament wiring

What a novel idea. Hadn't thought of that one. I solved the problem. I found that the 5687 I was using was microphonic. I also biased the filaments approximately 40v above ground. No more problem. You have to put your ear about 4 inches from the speakers to hear any hum or hiss. I can live with that.


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Old 27th May 2004, 01:03 AM   #14
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Congrats!

Why does biasing the filaments above ground reduce the hum?

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George Ferguson
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Old 27th May 2004, 04:07 AM   #15
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G, GREAT WORK!!

The attention to detail of layout is truly a class winner in my strive-but-never-get-there dream of a 'professional' look both underneath and above.
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Old 27th May 2004, 12:19 PM   #16
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Quote:
Originally posted by DrDeville
Congrats!

Why does biasing the filaments above ground reduce the hum?

Best,

George Ferguson
Try this thread. It will explain it better than I can.

http://www.diyaudio.com/forums/showt...p?postid=90211
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Old 27th May 2004, 04:52 PM   #17
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Thanks Gavin,

To save others digging:

From Sir Bas Horneman, I gather that electrons emitted from the heater itself can travel to the cathode, causing hum. Raising the heater bias stops this effect.

But perhaps the major advantage is preventing filament-cathode arcing in designs where the cathode can swing high above ground.

Thanks again, and I hope I got that right!

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George Ferguson
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