Happy Mother's Day to all... enjoying my Glenn 300B this morning.
I wanted to share my solution to some vibration induced hum I've been experiencing with the amp.
I added a number of weights purchased from
Amazon, and using them to weight down the amp, especially on top of the transformers. I find these help a lot, reducing a loud 60hz hum that been bothering me for some time now.
My configuration is:
3x 5kg on top of the transfomers
2x 1kg on the side near the 300B
2x ~1.5lb brass in the center
2x ~0.75 brass on the center sides
The smaller ones I purchased from mapleshade which is what got me started down this road as I found the weight did help just needed more mass, but you don't need them, they're more expensive than the one from Amazon.
All these weights need
cork pads as feet, or else the metal to metal contact may make the vibration worse, which took me a while to identify.
I replaced the feet with mapleshade threaded feet (need to drill the center front hole myself).
And went all out with mapleshade 4" block, I'm not sure how helpful this is, I think the weights contributed the most of the hum reduction.
Some photos so you guys know what I'm talking about.
If you're struggling with hum, I would try it. Buy from Amazon so you can return the weights if they don't turn out well. I think the main cause of this is the steel case, steel isn't a good vibration damper as aluminium.
Hope it help you, my Utopia never been so enjoyable now with most the hum gone. The remaining hums I believed are tube related, and will report back when I get HEXFRED adapter from Glenn.
