I have not built any phono preamps but have u considered the Jolida tube phono preamp. It is 495 dollars new and has adustments for different cartridges. I have thought about buying one myself. Shay
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I built a Bugle and it was terrific at 40 dB but pretty noisy at 60 dB, and Jim Hagerman said it really wasn't designed for high gain. I didn't have any medium output cartridges like your Grado, so I never tried it in the mid 50s. It might work, but I'd advise caution.
I now own the Jolida JD9 recommended by Shay123, and it's dead silent even at the highest gain setting. It also allows for rolling op amps; I have OPA637s in it right now and they were a major improvement. Of course, even used it's way more money than the Bugle.
I have not heard either the Bugle or JD9, and therefore have been unable to compare either to a stock Grado PH1.
I would be interested in in hearing from someone who has compared the PH1 to other preamps and can offer a detailed review. Please remember, the Grado PH1 is the preamp to beat, and one thing in it's favor is ease of modification, at least for me at this point.
I built a Tetra (phono)/Aikido (line) stage preamp with help from Roy Mottram of http://www.tubes4hifi.com/. Roy also was VERY helpful during the build process. Roy had compared several preamps (incl. his own design) and put the Aikido on top. I can only say that my preamp accurately, cleanly, and wonderfully transfers sound from the source to my amp.
One thing to consider is that the tubes you choose to use WILL affect the sound. I can't afford the best NOS tubes so am using some tested good, used tubes in my preamp. They made a difference. A good and trusted dealer in tubes is important.