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Title: Robben Ford mod..? Post by: Bluestone on April 25, 2009, 09:22:05 AM Any information out there on the so called Robben Ford mod..?
Does Nic maybe offer this..? From what I`ve read, there`s a power resistor instead of a choke in the power supply to induce more sag in the amp. Title: Re: Robben Ford mod..? Post by: erwin_ve on April 25, 2009, 12:54:11 PM Any information out there on the so called Robben Ford mod..? According to a tech on ampgarage ,that did see RF 's amp inside, it had a choke.Does Nic maybe offer this..? From what I`ve read, there`s a power resistor instead of a choke in the power supply to induce more sag in the amp. Title: Re: Robben Ford mod..? Post by: bluesfendermanblues on April 27, 2009, 05:19:51 AM The Robben Ford mod, involves installing a large resistor instead of the Choke to simulate the sag of a TUbe rectifier (like GZ34, 5U4 etc). I a misunderstanding that ordinary silicon diodes (like 1N4007) will be slow. I have never heard of a slow silicon component.
A resistor of 330 Ohms 5-10watt will do the job. However, you have to turn the (master) volume quite high, in order to build the sag, since its a product of the powersupply not being able to deliver fast enough, because of resistance in the supply. You can e.g. read more about in this link: http://ampgarage.com/forum/viewtopic.php?t=8520 Good luck experimenting. Remember you are messing with lethal high voltages! |