Best Sounding Passive Preamp

@zvovchik ,I have been using my Promitheus Reference C-Core TVC since 2009. Search these threads and there are a lot of postings by forum members.

I own a Promitheus TVC. I have had it in and out of my system (depending which amplifier I am running) for 3 years. It worked flawlessly when I used it with my Monarchy SM70's and Nola Boxer 2's.  I have even ran it using 25' rca's. No issues whatsoever. I very recently purchased an Aric Audio Unlimited pre to use when I pair my low gain First Watt F5 with the Nola's. I find to my ears,the Promitheus to be very true to my sources. YMMV.

Prometheus is a TVC passive (Transformer Volume Control).
http://www.audiocircle.com/image.php?id=7513

These tend to have a "signature" sound, and are not as transparent to the source as a potentiometer, ldr, or switched resistor based passives. Some love their colouration, some don’t. And if they use a winding on the transformer/s with some gain they can "ring" a bit. (they also tend to be expensive for a passive)

Cheers George

I wonder why no one mentioned Prometheus passive pre, any one have input on that?

Glad you got things worked out and are happy with results. They make some really good Schiit for the money in my experience.

Never had any luck with passives...  far inferior to my Ayre preamp.

I was just too dumb to hook the Saga up. I started all over again and followed directions, for a change, and despite my learning disabilities, got it successfully inputted and outputted.
The sound is quite refined both buffered and non-buffered. I don't know if Schitt is a tongue in cheek operation, making fun of the whole audio circus; in any event, I like the sound. My Transcendent tube pre was,by comparison, blurred and lacking air with more pronounced peaks in both voices and instruments, especially guitar. I had a CD over my PSAudio Lambda transport and Classe DAC 1--and 180 gram vinyl Eric Clapton's "Unplugged"..
Still listening, no doubt I'm sticking with the Saga. For $350? Come on Man!! What's not to like?

Michael, thanks for the info. Hope to hear that Schiit takes care of you.  No sound either passive or active? 

Mesch
I have spent a frustrating evening trying to hook up my Schitt Saga passive/tube active preamp, which arrived today. It is so passive I can't get any sound out of it. I emailed Schitt and got a pretty quick reply from Nick L, but only to ask questions re muting and if I had bad interconnects. I have good interconnects, I am listening via those same interconnects to my Transcendent Preamp,and Eric Clapton sounds really nice on my Audio Nirvana modified Thorens 125. I have checked my right to right left to left on all inputs and outputs. Fooled with every input on the Saga with the cool little remote: Nada, nada, nada. 
More will be revealed, but not tonight!

It's being shipped. I will report my findings!

Slowhand, if I might intrude, thanks in advance:

M Brown, I own the SYS. Currently use it with a Dynaco ST-70. Have not compared it to my Jolida Fusion all tube pre in my primary system.  Also own the Schiit Valhalla all tube headphone amp. Would like to know what you think of this new Schiit passive/tube active.

I might add that its a cheap enough experiment before I spend 5k on a CJ 5e !

I guess I must be one of those tube lushness guys. I already own a Schitt Asgard headphone amp, which impressed me enough to act like a Math guy and try the passive pre/tube combo, just in case!

Schitt Saga

This must be a bit new, $300 more though, should keep the tube lushness guys happy.

Cheers George

I just ordered a Schitt Saga. It is both passive and active, in case I want a little tube sound. I will compare it to my Transcendent Grounded Grid Preamp, a great bargain its own self! I'd like to spend a little money, before I spend a Lot!

kalali
I use a Schiit Sys, two inputs and volume control, all for $49. Very transparent.

+1 for this.

Simple test is, to go direct from source to amp, with a very quiet starting CD (eg:Ravels Bolero), with your finger on the stop button in case it gets too loud. 
This is the most transparent transfer from source to amp you can possibly ever get.

Then get the closest to that with a passive pre in between.

Cheers George  

One that uses autoformers. Once you try them, there's no going back. I love my ASL T1, and I’m sure the others are even better.

http://www.divertech.com/aslpassiveti.html

http://www.divertech.com/aslpassiveti2.html

http://www.townshendaudio.com/allegri/

http://www.dagogo.com/emia-remote-autoformer-review

http://www.audio-consulting.ch/?Products:Preamplifier:Silver_Rock_Meteor_AVC

I use a Schiit Sys, two inputs and volume control, all for $49. Very transparent.

If you want the Very Best the Townsend Alagri is the one to get. One of the best products OF ANY KIND that HIFI Critic has every tested. In another price range altogether. Yes I have one and use it with my CJ 350 or Gamut 200. WHAT EVER you are using now this will be better. I also have Audia Flight and custom tube pre and this is the one I use!

Just a continuing dialogue, OP bought a Ref5.

Folks, just curious, are you trying to help the OP who posted 10 years ago or you just need a reason to talk?

Doak, have you tried anything with the Slagle autoformer? I noticed I preferred the Slagle AVC (Bent)to the S&B MKII (K&K TVC). Funny that John at BENT switched from S&B to Slagle due to S&Bs actions, but I think it was also made for a better (relative term as both were excellent)sounding piece.

The DIYHiFi Django AVC (Silk autoformers) I'm using is the best passive I've tried - including 3 transformer based units and a couple of "pots in a box" (built my 1st in '85). Does VERY little to the signal and is very flexible in its utility. It's a keeper!

Short ICs with low capacitance (Cardas GR). By the way, Clio9 has started an LSA Forum at his new website for electra-fidelity.com - A good gatheirng place for LSA fanatics to share ideas. I can very easily see someone using the BENT for life and being very, very happy, especially getting off the merry-go-round:). In fact, I might buy one again, I do miss remote and balance control - it certainly would be at the very top of my list for passives to consider, though I'm not sure if John is still selling them; that is not clear to me as it seem he wanted to sell to OEMs.

Pubul57,

Interesting. I purchased the LSA recently and have been A/B'ing it against the Tap-X. It is very close but in my opinion I find the Tap-X has slightly better drive in my system at least and produces a more open soundstage.

Are you running very short interconnects between the LSA and your source and between LSA and amp? Would be interested to hear your thoughts on how to get the best out of the LSA.

Thanks

James

BENT was the best of all I tried, till I tried the LSA, but certainly at the pinnacle of passive options, and likely the best TVC (like the AVC even better), plus a lot more flexibility than the LSA which is a little hairshirt, but....

Bent Audio Tap-X

Deradave, try buying or building an LSA DIY - no pot better than no pot. Not the killer value of your DIY, but I think you will find even better performance if you can believe it.

I notice the consensus in the Agon chattering class is the TVC/AVC "kill" resitor based passives. Not my eperience, but I do wonder what a TVC/AVC would be the better approach, there obvioulsy some systems that would be better served by some impedance matching provided by them.

I bought 20 kits of parts from luminous after trying their pre-amp. Used with a Naim NAP250 & AVI Monoblocks.
Inside there are just two Caddock resistors & one 10K Noble Pot. The resistors are 2k87 ohms. The rest is a box, wire & 4 phono plugs. ( Must use Caddocks for best sound, we tried all the others, as was the case with the Noble pot)
Cost to buil DIY is about £20 max. Only suitable for line level, CD etc. Just perfect, clear, deep bass but controlled & beats active pre-amps if driving direct from a CD.

Scp, try the Lightspeed Attenuator - not much money either, I think you will like it since you must have a passive friendly system.

I bought the Axiom from Luminous Audio when my pre went to the shop..and thought I was buying a cheap POS to fill in...wow..was I surprised. It made me realize passive is worth a second look.

I have both the TLC-1 and the Lightspeed. The McCormack is maximally convenient and very good sounding. The Lightspeed is maximally inconvenient but practically unbeatable sounding. Both are around the same price, i.e. cheap, so there are some very cost effective passives out there.

Oh, one I forgot to mention that was first-rate is the $135 Pot-in-a-Box from Music Reference. On the down side, it is built with a cheap plastic box (though a metal box version is available for 3x the price), on the plus side, the plastic box is non-ferrous, and it has an extremely well made Noble attenuator made many years ago, that isn't made anymore because of the high cost of manufacturing. When you don't need buffering, hard to beat, except for the $450 Lightspeed Attenuator.

An Axiom from Luminous audio... You can't go wrong at that price it's a no brainer. Great to have as back-up.

Tony

Will second Jedinite24. The McCormack TLC-1 is hard to beat, if you can find one.

At one time, the Reference Line passives were thought to be among the very best, any experience with their gear versus the TVCs and AVCs that have come to market since then?

For me it is the McCormack TLC-1 stock or Deluxe. To me they look and sound great. I especially like the feel of the controls of either preamp.

I have owned a few passives: Bent AVC, K&K with S&B102, Placette RVC, and Goldpoint. All were bettered by the Lightspeed Attenuator - but all were first-rate and the tranformer and autoformer units are much easier to match with amps and cables. I also hear the First Watt B1 at RMAF and the system sounded quite good, but not my system or room so that is just a tentative observation; but how many things by Nelson Pass don't sound good?

Bent Audio and Placette make two of the best at reasonable cost.

Lightspeed Attenuator - do a little homework. You won't regret it.

http://www.diyaudio.com/forums/showthread.php?s=&threadid=80194&perpage=25&pagenumber=1

Look for an EVS(Electronic Visionary Systems)passive produced by Rick Schultz some years back. It retailed for around $450 new and it's about as clean and transparent as you're going to get.

I owned it, a couple Reference Line models, and an old McCormack or was it Mod Squad back then? At any rate the EVS used a pair of stepped attenuators for gain and balance and had a "straight thru" mode where the only thing in the signal path was a couple RCA's coming and going, a very short piece of wire and one or two resistors. Can't get much simpler than that. It was by far the best sounding passive I've heard.

The best sounding with the purest signal path is the Axiom made by Luminous Audio. www.luminousaudio.com they are $160.00 with shipping in the usa. It uses caddock resister and is shunted to ground so the actual audio signal does not go through the potentiometer. The worst passive ive owned is the Creek and the adcom. They are horrible. Good luck

You should look at Placette. Not as inexpensive as these others, perhaps, but state-of-the-art sonics. Plus, in-home 30 day trial.

If your looking for a passive, you should really go to Rick Schulzes site tweakaudio.com his EVS passives are the best out there and very reasonable. Back in the day I had one in my system and it was great. In the end I had to go with tubes but I had one for 6 years in my system. Stereophile had them as Class A (for what thats worth). Best-Gary

I assume that your source has enough output to directly drive your amplifier. If your source has the ability to control it's output level why not scrap the passive preamp and go directly to the power amp. You will eliminate any unwanted coloration or noise and certainly save yourself a few dollars. After all, a passive preamp is only an attenuator.

Find Brad at Virtual Mode in Connecticut. Extremely well-regarded inexpensive passive preamps.

I have the Chase RLC preamp. It has a remote control and 4 inputs with balance, mute, bass and treble all controled by the remote. Stereophile mag gave it its blessing as being transparent. If u have a preamp without a remote control, u can connect the Chase into the tape monitor and then u will have a remote control of ur volume!

Thanks to all for the info.

I haven't heard any commercial passives besides the Chase RLC (a great choice for you, incidentally, and I've seen one listed, Audiogon or Audio Shopper, for $60). But if you want to MAKE a passive that will (maybe) make you want to sell your active preamp, get in touch: nicetom@sonic.net. It's easy to make a passive for a few hundred dollars that SHOULD be better than virtually all commercial passives, and I qualify this only because there are so many I haven't heard. Inferences from parts quality are seldom wrong, though.

I agree with 1953, the Reference line gear is top notch. As noted above make sure your gain is adaquate. Good listening!