How to reduce Hum on a Blues Junior - An interesting read with uncommon solution

[kagliostro]

Here you can read the experience of a guy who was trying to solve a problem of Hum in a Blues Junior

the solution found is not common, but simple to implement

http://billmaudio.com/wp/?page_id=882




K

[kagliostro]

If you read the content of the link

you can read:

I tested many, many configurations and materials.

and also that strangely an aluminium cylinder, used as shield, gived best results with respect to a mild steel can

However the author ended that the best solution is that shown on the photo (you can read the details on the link)

K

[vicentebd]

nice see the positive result, with  angled piece of metal

[jjasilli]

Everything old is new again!


See attached photo of a circa 1962 Stromberg Carlson PA amp with vertical shield between a power tube and a socket for an optional relay (which would generate a magnetic field).

[kagliostro]

I was thinking more to a heat shield to protect the relays from the heat of the power tube

but may be it is as you say JJasilli

Franco

[jjasilli]

I never thought of that!  I just assumed it was as electromagnetic shield.   

[trobbins]

Definetly heat shield IMHO.