put tube amp on to shelf of a rack

No good. He needs one small enough the forks fit between the rack. Forget Lowes, think Tonka. 

The way to do it is with two pieces of peg board or other appropriately sized boards that are smooth on one side. Place them one on top of the other leaned up into the bottom shelf. Place amp on board. Push. Slide amp into place. If you chose the right board leave it there. Otherwise use a padded wood lever to lift one side at a time to pull it out. 

Stand back crack a cold one, marvel at how clever you were, and start dreaming up ways to keep the darn thing from melting everything above it.

@ebm  @lak @elevick @elliottbnewcombjr @millercarbon

Thanks a lot for all the suggestions! I think with peg boards and sliders it should work to slide it in to the bottom shelf.

However I also see the concerns about heating up equipments on top. I was not thinking about that. How about I put the tube amp on top of the shelf? My living room is a bit small and I fear that my kid would run into the amp if I put it on the floor or amp stand. 

I checked the spec, the VTI rack holds 200lb per shelf and the salamander rack holds 150lb per shelf. Are these safe numbers to put a 105lb tube amp on top? 

https://www.amazon.com/Stark-Industrial-Engine-Folding-Workshop/dp/B07WZXTTKF
These work well; just be sure to get some nice soft but strong flat straps to go around the amp.

I'd go top shelf, I have my 85 lb tube integrated on top shelf of a solid steel rack . If the shelves have the weights you quoted I don't see why you'd have a problem

just call a friend and say free beer and bbq.