ScottMarlowe wrote:A jumper in the loop is pretty much an old wive's tale. The only reason to do it really is if your internal switch for it is iffy etc and putting a jumper in gets the signal through cleanly. It's right up there with people who think their power cord has a large effect on their sound etc.
Did a bot more research and it seems your logic just might be wrong. IDK if I can link to another forum without getting in trouble so I will just "Borrow" some info I found. IF I can/am allowed I will give credit where it is due...
First part was apparently copied from a UG archive... ""Its due to most amps having a buffered effects loop which basically keeps effects from degrading your signal.....
When you plug anything into the effects loop the amp is expecting you to be running a pretty long length of cable into various pedals. There for you would get quite a loss of signal strength. To combat this when you use the effects loop a buffer is engaged which boosts the signal and in most cases it can restore you bit of clarity and fullness along with the signal boost. This is another reason why they say get a pedal with a good buffer and put it in effects chain if you running a pretty good length of cable and multiple effects.
Basically doing this turns the effects loop into a lead boost of sorts as well. Alot of guys with amps with controlable and switchable effects loop use this as a physical lead boost. They dime the levels on the effects loop then kick on the effects loop for a lead boost."
Then on the same thread a person found a quote from youtube that reads ""I just got a used Vavleking 112. THIS TOTALLY WORKS!! Its actually a design flaw that works out in the amps favor. Because there is no Send and Receive blend controls for the effects loop, it sends out a slightly hotter signal when pedals are used to compensate for any clarity and gain lost through your pedal chain. But since you "jump" it with no pedals, it ads a touch more gain and high end clarity to the original signal. I love my little Valveking 112 with this jumper!"