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I'd be happy to summarize my listening experience at your home this past Wednesday. A brief recap. The system in general performed at a very high level, and seemed to get sweeter and smoother as the afternoon wore on. What I heard was a very relaxed, effortless, and lifelike musical presentation. It was engaging and thoroughly enjoyable. The stage was wide and deep, and retrieval and resolution of micro detail was excellent. Most important to me, was the obvious coherence. Time related linearity bettered some of the obscenely expensive systems I have heard. The interconnects were a major component in the chain. Changing them out made a huge difference, which also attests to the ability of the loudspeakers to reveal these subtle--or not so subtle shadings. Hope this proves helpful.Randall
R) important Resistor's for substitution are R4 (1W is good) , R14, R3, R2. C) important Capacitor's are C19, C3, and C1 if you choose to fit a DC blocking capacitor.
You sure, I see some Xicon's that could easily be swapped for some FC's or BG in the signal area.
Dear KL Firstly, let me thank you for introducing me to the GB300D. I had only read about it in the various audio forums and was very interested to hear it for myself. The following is taken from notes I made whilst auditioning the amplifier at your place, I was also able to compare this to the notes I had made at other listening sessions we had had with your previous (and highly regarded) amp. My first impression was of an incredible smoothness to the music, certainly the best I have heard to date. The next impression was the total abscence of any sense of speaker location. When doing a critical listening session I always do so with my eyes closed in order to focus better on the music and these two features positively lept out at me immediately. At first I thought the soundstaging was a little narrow, then another CD was played and the soundstage was well beyond the width of the speakers and had futher depth as well. This amp really shows up any flaws in the recording as you can clearly hear if the recording engineer has done his/her job properly. Dynamics were sensational as well, but yet again, the quality of the redording is paramount to getting the best dynamics. People who get this amp will certianly be searching for audiophile quality CD's as there is the quality there to show up whatever signal the amp is fed. Now onto the various levels of the musical spectum. Bass was clean and clear, definitely not a one note bass amp, this one. It was very easy to discern the bass was played on either an electric or accoustic guitar. Mid range was exceptionally smooth and all the instruments played within this range were there right in front of you. Treble was also very good but perhaps not as prominent as your previous amp. One feature I always look for is the quality of reproduction of the piano as this is the instrument I play. I can report that the GB300D has the honour of being the best I have heard to date. Prior to taking up playing the piano I had always found the reproduced piano music lacked a lot and it was only on hearing it played live that I found what rich harmonics this instrument has. As you would know the piano is a large instrument and this is because it has a large sound board in order to produce it's beautiful tones and harmonics, I am pleased to say that the GB300D is easily the best I have come across, well above all previous amps. Lastly, I had an unusual experience during the latter part of the listening session, as mentioned before, I had my eyes closed whilst listening and at some stage I started visualising the group in front of me. I know critics have written of this before but it was my first experience of this and I found it quite startling to have this happen to me. All in all an exceptional amplifier. best regardsIan
ShinOBIWAN, just ordered the following caps for his GB300D's: C4, C8, C19, C9 and C5 with Blackgate N 10uf 50v; 8 x Blackgate 100uf 100v for the bootstrap caps; For C3 I was thinking of something like a silver mica or tantalum?
C2 and R2, the 1nF (1000pF) and input 1K resistor, set an input filter response of -3dB at 160KHz. C2 cannot be removed, as it's necessary for input stage bandwidth and stability. It can be reduced to 680pF for a 250KHz bandwidth or even as low as 100pF. The standard values result in a 20KHz rolloff of < 0.1dB and < 3 degrees of phase non-linearity, which should be inaudible.
Hi Mike,That's good progress. I'm not providing any help. Let's see how easy it is.Ha, a weekend off for me is one NOT building amps , but mowing the lawn, fixing things around the house,..... did get a body surf in sunday morning!cheers,greg
