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- Jan 1, 2013
- Salt Lake City
My OT is 50246, which their website shows for a 5E3. They show another for just vibrolux/tremolux and vibroverb.
I have no resistors or pots on hand and would have to order, no problem. Just so I understand, the pot allows us to vary the volts and any extra is shunted to ground through the 33K resistor. Same as the existing 56K sending it to the ground above. I do not understand how it works with only one wire, how do the volts get back or is this just limiting the voltage and the remaining just keeps going? Yep, I am that much of a novice.
Draining the caps, I tried to get a link to work on Robs site on how to, but keep getting an error. Long story short, i have no idea, other than wait for days.
Thanks for the help
Draining caps is easy; the key item on Rob's page is to build a cap snuffer. He gives this link:
A nice extra is to make one of the wires on yours with an alligator clip on the other end, to clip to the chassis. Then you just clip the gator to the chassis and hold the resistor lead to the positive pole of each filter cap for a few seconds. If you hitch up your meter you can watch it drain and confirm it is drained. Lots of other points could be made -- most hot amps in working order drain caps spontaneously in less than a minute. But measure and drain always works.
As you note, your OT only has one secondary, the yellow = 8ohm, so that's not going to be an issue. I think in supply chain times, we're gonna see lots of substitution.
If you want to replace the 56K bias range resistor with a better value, values as per @jsnwhite are a good idea. I do like a pot, though, and 10K linear pot works nicely. I'm confused my Mojo's diagram. Maybe Jason or somebody with a 5F11 can chime in with a clear layout...