Any thoughts on removing a preamp from your system


Hello guys

This is my first post and I have been on Audiogon for a number of years now.

My question to the group is, have any of you removed your preamp completely from your system? Run your front ends straight to your amp? And, what benefits have you noticed, if any.

And finally, if you have used a passive preamp in your system, what are your thoughts on the setup?

I understand one would need to have some sort of "pot" in the signal path to regulate volume.

Herb
hcalland

Showing 4 responses by hcalland

Wow - this is good stuff.

Based on your comments I connected my VPI Classic TT thru my Fosgate Phono amp directly into my Audio Mirror mono blocks. The blocks have two RCA connectors with a toggle switch between the two. Up until now, I had no idea why the builder of these amps included two RCA connectors. The amps have a pot on the front for setting the gain I assume, so it appears I can run a source directly into the mono blocks.

It sounds wonderful for now, I just have to switch the toggle to the Fosgate source cables when I want to listen to my VPI table.

I am running my 5.5 VTL preamp into the other RCA inputs. I feed a Pathos InTheGroove phono amp and Marantz SACD player into the preamp.

The Pathos Phono is fed by a Miyajima Mono Cartridge for my second TT, a Nottingham Space Deck. I am using balanced interconnects between the Pathos and preamp with good results. I have a low level hum, but I am told that is common for the cartridge.

Anyway, if I don't add anymore source components, I believe I can live with this setup for now. I don't know if the maker of the Audio Mirrors intended his amps to be used in this fashion, but I like the sound with the direct feed. I was thinking a passive preamp would allow me to get rid of my VTL, but based on your comments I think I will hang on to it.

Thanks
Guys, It seems most of you favor a nice preamp in the path.

Well I made what I believe is a new discovery over the weekend, which maybe you can help me with.

Here's my situation.

I am running two turntables and their respective phono amps thru my VTL 5.5 preamp.

One is on the RCA input marked Phono, the other on an AUX input. I direct connected (i.e., by_passed the preamp) the one on the the AUX input and immediately liked the sound. I am still loving it. The direct to power amp connection just sounds more transparent and immediate to me.

1. Could I be imagining this increased transparency?

2. Could it be the AUX input is not suited for a phono amp connection and only the phono RCA connection is appropriate for phono? (The table running through this connection sounds great, albeit a mono cartridge setup.)

3. Or should I re-tube my preamp?

Herb
Hi Phusis, Iike your analysis.

Yesterday I returned my Fosgate Phono amp to my VTL 5.5 preamp, and immediately noticed a lost in dynamics and transparency. Needless to say I switched back to the direct connection of my phono amp to my Audio Mirror power amp. The Audio Mirrors have pots.

I realize these results maybe due to "total" system synergy, which is why I am not throwing out my preamp just yet.

I have two other source components (Marantz SACD, and a solid state battery operated option PATHOS Phono amp), which I plan to test tonight.

Herb
Hello Phusis.

Interesting synergy comments. I have not looked any further into simplifying my system other than the direct to amp configuration. I use two power conditioners mostly because I had experienced some low level hum, which has all but vanished with them in place. My mono amps are point-to-point wiring, and my speakers are a 3 way design. My speakers could, at 89db be more efficient for the low 20 watt Monoblocks, but I don't play my system at high volumes, so it all works.

The direct to amp did not work so well with my SS phono amp. I suspect the mono cartridge used in this configuration is the blame. It has always had very low level and tolerable hum. A condition common to the design according to the Japanese designer. But with the direct-to-amp setup the hum was remarkable. My preamp evidently helps control the noise level.

I did not try the SACD player because as you well know, digital signals will always need to be tamed. I figure the VTL preamp can only help in that setup.