Hello piano3,
I do not think that a chassis needs to be steel. I have not done a side by side comparison with aluminum. Aluminum works well. I have noticed on my bench where there were exposed power transformers and voltage regulators operating (a noisy world) that a ground (earth) lead attached to a line stage chassis made any audible noise disappear from the line stage.
DT
All Just for fun!
I do not think that a chassis needs to be steel. I have not done a side by side comparison with aluminum. Aluminum works well. I have noticed on my bench where there were exposed power transformers and voltage regulators operating (a noisy world) that a ground (earth) lead attached to a line stage chassis made any audible noise disappear from the line stage.
DT
All Just for fun!
Yes DT, I agree and have done many experiments with different grounding arrangement. However as far as aluminium-vs- steel chassis is concerned, both are great electrostatic shields but only steel can give any(probably rather limited though) magnetic screening. I suppose an ideal chassis(and cable screening) would be non work hardened mumetal-that would really make some boutique components/transformers seem cheap.
This is probably a rather dumb question; in a transformer coupled headphone amp are the bottom of the output transformers commoned at the TRS socket and left floating or are they actually grounded? Thanks, N.A.
Grounded. Otherwise if your primary shorts to the secondary you are looking at a few hundred volts across your head.
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