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06-14-2021, 03:56 PM
Hi Guys
The Hammond rack chassis are not really meant for the kind of weight that a tube amp over 50W might have - even at 50W panels will sag. Unfortunately, most of Hammond's chassis sizes that are useful to us are made in thin-gauge steel or aluminium - kind of ironic that their enclosures won't support their iron
There is a more expensive rack series with extruded sides but I can't find the catalogue that was in. I suspect that because of the "4-screw easy panel removal" in the rack designs, that this would sag, too.
Placing the PT and OT inside a 4U chassis seems like what you would want to do anyway. If anything goes outside it should be the power tubes. Support needs to be beefed up using bent metal not just thicker metal. Think of an I-beam. The vertical web gives it strength and the top and bottom panels provide rigidity horizontally. if you had a U-shape where the bottom of the U is against the chassis panel, the vertical parts would help to keep the support plane from sagging. The U has to be fairly strong material itself, stainless or thick steel.
The added U above can be added inside or outside, since whichever panel the TXs are mounted to will sag. Seems like you were going to have them on top, hopefully tubes as well, so why so much space underneath?
Have fun
The Hammond rack chassis are not really meant for the kind of weight that a tube amp over 50W might have - even at 50W panels will sag. Unfortunately, most of Hammond's chassis sizes that are useful to us are made in thin-gauge steel or aluminium - kind of ironic that their enclosures won't support their iron
There is a more expensive rack series with extruded sides but I can't find the catalogue that was in. I suspect that because of the "4-screw easy panel removal" in the rack designs, that this would sag, too.
Placing the PT and OT inside a 4U chassis seems like what you would want to do anyway. If anything goes outside it should be the power tubes. Support needs to be beefed up using bent metal not just thicker metal. Think of an I-beam. The vertical web gives it strength and the top and bottom panels provide rigidity horizontally. if you had a U-shape where the bottom of the U is against the chassis panel, the vertical parts would help to keep the support plane from sagging. The U has to be fairly strong material itself, stainless or thick steel.
The added U above can be added inside or outside, since whichever panel the TXs are mounted to will sag. Seems like you were going to have them on top, hopefully tubes as well, so why so much space underneath?
Have fun
