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Hi
I have heavily modified Bottlehead Paramour amp that uses 76 driver C4s loaded, 180vDc on plates, Schottky diodes on cathode 9vDc, 1.22uF parafeed cap, 750 ohm tantalum grid stopper 220k tantalum grid leak resistor going to Emission Labs 2A3-S. Parafeed cap is about 11uF, Iron upgraded to BH-5 Full Nickel output and BH-6 Plate Chokes, Audeze LCD-2 Headphones connect the system to my ears.
I've been doing upgrades for over 10 years and it sounds amazing. I'm slowly running out of ideas as how to improve the sound and I've been wondering about replacing 220k grid leak resistor with grid choke. Magnequest and Lundahl LL 1670 seem like good candidates. From what I've read it should impact the sound in positive way, does anybody have experience with similar circuit ?
Any help would be appreciated.
Thanks,
Follow Ups:
Probably the only thing you will have left after that is to put the amp in a larger/prettier chassis. Then you will have room for Oil caps and keep the power transformer further away from the circuit. The bigger upgrade is to save your pennies and get the Audeze LCD-4. :-)
I have Obbligat oilers,FT-3,K72P-6, K40-9, K75 ,MBGO KBG etc. in power supplys and 2A3 RK. Amp measures 20x20x12, there are two power supplys under desk for preamp and filnaments. LCD-4 would be nice. Actually headphones are the only component that I haven't modified, accept for cord.
He would love that amp. It is wild.
You might try taking out the line level preamp and running the source directly to the amp. If you have enough gain that will be a significant improvement.
Have you played with the parafeed cap value?
Often times it needs to be bigger that you think to keep the LC tank circuit resonance amplitude down and the frequency of that resonance down out of the audio band.....
Well, same thing when you add a grid choke. The coupling cap value might need to be increased.
Tre'
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