I haven’t seen any PCB-based RTP3 builds in this forum before. Would love to know how they compare against a point to point effort. At least you did not skimp on the PSU, the original PCB clone had a very basic PSU.
Did you keep the preamp itself in the C version or did you hack the PCB into the D version?
Did you keep the preamp itself in the C version or did you hack the PCB into the D version?
I am not entire sure but I think this is a RTP3D version.
I had first troubles getting the shunt regulator work as is supposed to. In the process I burned few components. Then using the external power supply with this PCB version was another challenge. I think was worth it, sounds really good.
I had first troubles getting the shunt regulator work as is supposed to. In the process I burned few components. Then using the external power supply with this PCB version was another challenge. I think was worth it, sounds really good.
Great build! I am pleased you are happy with your RTP3 - it well repays the many hours of work.
You mention that you had trouble getting the shunt regulators to work. Are these on PCBs from VSE, or are they from Sylvain too? I would assume the circuit details are very close, as this was one of Allen's most mature products. The ones I use now in both my RTP3 and SVP2 were supplied by VSE and have worked flawlessly. I am impressed by the complete lack of drift in the regulated voltage.
Alex
You mention that you had trouble getting the shunt regulators to work. Are these on PCBs from VSE, or are they from Sylvain too? I would assume the circuit details are very close, as this was one of Allen's most mature products. The ones I use now in both my RTP3 and SVP2 were supplied by VSE and have worked flawlessly. I am impressed by the complete lack of drift in the regulated voltage.
Alex
Shunt regulator is included in the big PCB designed by Sylvain, one resistor value was off and needed to be increased from 1M to 1.5M. First tests was done using all the power regulators on the big board and using individual transformers. Once this was done I went for the external power supply.
The external power supply provides raw HV and then feeds into the shunt regulator on the big black PCB, i had trouble to get the raw HV within the range needed for the shunt regulator. After a lot a fiddling until I got the combination right. There were several hacks to the big board and to the external power supply to make those work. Probably this was the most challenging part.
The external power supply provides raw HV and then feeds into the shunt regulator on the big black PCB, i had trouble to get the raw HV within the range needed for the shunt regulator. After a lot a fiddling until I got the combination right. There were several hacks to the big board and to the external power supply to make those work. Probably this was the most challenging part.