FlukeII
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- Jan 25, 2011
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I forgot to mention, the VISHAY Bulk Metal® Foil Technology Industrial Precision Resistors, VSR Series resistors are very expensive. $$$$
Personally I favour the VISAHY Vishay Beyschlag MBA 0207, Professional Leaded Resistors for all the positions in the circuit:
I used the VISHAY MBB 0414, 1W 10E Resistors as the Emitter Resistors in the output stage.
Latter I cahnged these to three (3) 30 Ohm MBB 0207 resistors wired in parallel (10 Ohm) to replace each of the 10 Ohm Resistors; to my ears and mind this improved the slew-rate of the amplifier - making a change in the speed and impact of the sound to be faster and a little more punchy. Putting a 1kHz square wave into the Amp and looking at the slope of the waveform on a Oscilloscope, there was about a 14% improvement in the Slew Rate, steeper angle of dV/dt, after making this mod. Kostas Metaxas takes this to the extreme, check out his website: http://www.metaxas.com This is an example of what I mean:
Excerpt from IKARUS User Manual (downloaded off website):
My experience with the sound of VISHAY BC MBB 0207 resistors in the Lehman Amp circuit has been:
I was using the Beyerdynamic T1's and using a varity of Jazz and Alternate, such as Zero 7 - I really like their music and the variations on a single CD or Album!
I would be really interested to know what others have tried. One of my friends has used all 5% Carbon Resistors and likes the sound a lot - It wasn't to my taste.
Personally I favour the VISAHY Vishay Beyschlag MBA 0207, Professional Leaded Resistors for all the positions in the circuit:
I used the VISHAY MBB 0414, 1W 10E Resistors as the Emitter Resistors in the output stage.
Latter I cahnged these to three (3) 30 Ohm MBB 0207 resistors wired in parallel (10 Ohm) to replace each of the 10 Ohm Resistors; to my ears and mind this improved the slew-rate of the amplifier - making a change in the speed and impact of the sound to be faster and a little more punchy. Putting a 1kHz square wave into the Amp and looking at the slope of the waveform on a Oscilloscope, there was about a 14% improvement in the Slew Rate, steeper angle of dV/dt, after making this mod. Kostas Metaxas takes this to the extreme, check out his website: http://www.metaxas.com This is an example of what I mean:
Excerpt from IKARUS User Manual (downloaded off website):
My experience with the sound of VISHAY BC MBB 0207 resistors in the Lehman Amp circuit has been:
- Fast and rythmic
- Clean mids that are a little warm,
- Detailed imagery
- Sound that was alive, but to me natural
- I found every song I listened to to be independent in timbre and tonal characteristics
I was using the Beyerdynamic T1's and using a varity of Jazz and Alternate, such as Zero 7 - I really like their music and the variations on a single CD or Album!
I would be really interested to know what others have tried. One of my friends has used all 5% Carbon Resistors and likes the sound a lot - It wasn't to my taste.