Lewm/Audpulse
My standard Marantz 7 (1996 reissue) has enough gain for the Dynavector Karat Nova 13D, albeit with a little tube noise at louder levels. This Karat Nova 13D however is not standard. The original output was 0.12mv. When Dynavector rebuilt Karat Nova's they always started with a new generator. I got the last 13D generator in the early 2000's. When I had an accident and broke the diamond cantilever they rebuilt it again as a special favour ( they no longer rebuild them ) using a Karat Nova 17 generator, and the output is now 0.3mv. This is what I believe I have
http://www.dynavector.com/pdf/nova17d_ebro.pdf Fortunately I have another Nova 13D still original.
The standard 7 also has enough gain for the Koetsu's and Carnegie (0.28mv) that I've used over the years. It does not have enough gain for the Ikeda (0.15mv).
My modified Marantz 7 dates from around 1960 and has the followng mods :
1st stage - did the Smith mods, bypassed all the switching & tone controls, bypassed the balance & trim pots on phono and line output, resulting in a phono only preamp with only a volume pot in the signal path.
2nd stage - did the Pooge circuit changes - tighter RIAA, increased output coupling caps
3rd stage - added a custom designed outboard regulated power supply ( much better design than the suggested Pooge power supply ) with additional superfast C on the tubes. The outboard supply also has additional star earthed binding posts so all components in the system can be star earthed to one single point.
4th - replaced all resistors with Roderstein metal film and caps with MIT Multicaps.
This was all back in the early 90's. The modded Marantz has a little more gain, substantially lower noise floor and more resolution than the original 7, but retains the unique characteristics of the original - if you read the TAS reviews of the Marantz & and Smith modded version they are absolutely spot on - a unique in my experience ability to accurately orient instruments in Carnegie Hall, a very coherent music presentation in terms of timing and expansive mid range. My take on the 1996 replica is that it is very good, but a little slow. I suspect the polypropylene caps in this version are not great. In Japan they buy replicas and then install vintage bumblebees. In Europe they buy replicas and throw in the Duellunds.
From the mid/late nineties I used a Jadis for about 10 years until someone desperately wanted it. They did me a huge favour because when I hooked the old modded Marantz 7 back up out of curiosity it blew the Jadis away completely. Every time I try another preamp I lose speed and coherency. Even my friend with a full Goldmund system shakes his head - he cannot understand why my ancient system with about 50 years of components sounds so quick. As well as the Goldmund PH3 another friend has the Lamm phono. It is sad that these cant live with a 1960's design. As is always with audio it is a sum of the parts.