Loadings resistors in M60

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Greetings
I have a pair of the orginal M60 amps which I built from kits. They have most of the upgrades plus mods. I have been reading about loading resistors. I have 4.7K resistors from the XLR to the base of the tube (I think 2&4) should I change this to 1.2K. I am using a MP3 pre-amp.

Posted by Jackb0 (A) on March 24, 2006 at 04:15:40
In Reply to: Re: Input Loading for MA1 mk. III & MP3 posted by Lew on March 23, 2006 at 09:57:37:

I plan to do some listening this weekend and try some different resistor values to hear the effect.
I can already say, several distinct differences after removing them completely. As I mentioned in my other post, the sound was a little warmer and more musical. However, this was at the expense imaging, detail and most noticably the noise floor was much higher. The background has so much going on that I think it it makes you think the sound is warmer, more euphonic. After listening for a little while I realized this won't work for me.
"I started with 300 Ohms per phase (600 across 2 & 3). That was to low for the MP3. I switched to 600 per phase (1200 total) and that worked much better. That is what I have been using until I removed them completely to hear the difference."
I have also installed V-caps in my MP-3. To say the least they are the best mod. I have done to my MP-3. The sound is much more open and the piano sound more natural.
Thanks for our comments
Bryan

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Topic - Loadings resistors in M60 - bryanp 09:45:29 04/14/06 (4)

Re: Loadings resistors in M60 - Legendre 15:54:10 04/14/06 (0)

Re: Loadings resistors in M60 - pathologymd 11:20:55 04/14/06 (2)

Re: Loadings resistors in M60 Thanks - bryanp 11:40:32 04/14/06 (1)

Re: Loadings resistors in M60 Thanks - Pathologymd 13:55:34 04/14/06 (0)

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