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Author Topic: Robben Ford mod..?  (Read 5329 times)
Bluestone
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« 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.
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erwin_ve
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« Reply #1 on: April 25, 2009, 12:54:11 PM »

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.
According to a tech on ampgarage ,that did see RF 's amp inside,  it had a choke.
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bluesfendermanblues
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« Reply #2 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!
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Respect for the big guy's work....we're at this part of the forum because of HAD's amps.
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