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JTM45 Mix Resistor values
Posted: Thu Nov 14, 2013 4:16 pm
by coldengray
Was doing some work on my Metro JTM45 kit that I bought and noticed the previous owner assembled it with Mix Resistors of 220k instead of 270k. Would I hear much of a difference if I "fixed" that?
Re: JTM45 Mix Resistor values
Posted: Thu Nov 14, 2013 10:45 pm
by OnTheFritz
Be sure you're referring to the mixers, and not the resistors in the phase inverter.
Have a pic?
Re: JTM45 Mix Resistor values
Posted: Fri Nov 15, 2013 11:27 am
by coldengray
The bright and normal channel mix resistors. 270k on the Metro layout...220k on mine unless I misread the AB bands, which is entirely possible. Pic:
Re: JTM45 Mix Resistor values
Posted: Fri Nov 15, 2013 8:40 pm
by coldengray
Anyone?
Re: JTM45 Mix Resistor values
Posted: Fri Nov 15, 2013 10:48 pm
by OnTheFritz
Looks like you are correct in your assertion. The difference? I don't know, the values are not that far apart compared to the 270K vs the 470K in the later amps.
Easy to change and let your ears decide.
Re: JTM45 Mix Resistor values
Posted: Fri Nov 15, 2013 10:51 pm
by Janglin_Jack
470K vs 270k makes a difference. But I doubt 220K vs 270k would make any difference. I can't say for sure as I have not compared a 220. If the amp sounds good as is I would leave it.
You could change one to see if you hear a difference.
Re: JTM45 Mix Resistor values
Posted: Sat Nov 16, 2013 12:18 am
by coldengray
The amp sounds amazing so I probably won't change anything. I have a 1987 clone too so I have Lead spec covered. Thanks for the input guys.
