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SOLD OUT: PCE/Turbografx THS7374 RGB amps/cables and pre-amped consoles


mickcris

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I have updated the amp with output resistor values closer to the ideal values of 86 ohm with a 586 ohm to ground. The ideal values can only be done with 4 resistors so have changed to the closest I could get it with 2. Now using an 86.6 ohm resistor with a 604 ohm resistor to ground. Both resistors are 0.1% tolerance. See the math below:
M22k3bg.jpg

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Hey mickcris,

 

Don't suppose you can make a SCART cable for the SD System 3 output? I know there was a lot of arguing on the proper way to do it and I was wanting to get a cable but wasn't sure what was the proper way to get one.

You would need a Genesis 2 cable. they said they added a 21 or 22 ohm resistor inside to add to the 75 ohm resistor in the cable to bring the voltage down. Since they screwed up the design, it was pretty much the easiest way for them to "fix" it. If you want a proper built amp for RGB, you would need to modify your console. If you dont care that the output impedance isn't right, then you can use the output from the Super SD system. But you probably wont notice the difference with your eyes.

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