Dual mono passive Pre amp, single ended (advice)

[macvisual]

I quite like the idea of a Dual Mono passive preamp (single ended), many years ago I owned one by Audio Synthesis, but quite fancy returning to this simple single input again...

I know there's many models/designs out there I'm looking at the Promitheus Audio version...

Are there any benefits of the Dual Mono passive pre's (single ended) compared to the normal passive setup I wonder..?

Regards;
Peter
Scotland

[RothwellAudio]

All passive pre amps are dual mono. "Dual mono" is a term usually applied to stereo amps that have independent left/right power supplies, but passive pre-amps don't have power supplies anyway.

[farflungstar]

There are better passives than the Promitheus and for sound electrical reasons, autoformers are better and the best are the Dave Slagle autoformers. Two separate modules constitute right and left so definately dual mono.

With any luck I will have a beautiful example of one up for sale shortly but if you decide to go your own route the modules are only around 350$ - and incredibly simple to set up. Lol if I did it anyone can - they're almost plug and play.
Adey

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[Sovereign]

Here is internal shots of my dual mono Stereo Cofee passive pre.
It certainly is dual mono as the left and right channels are totally separate. This is a heavily modified one by Chris Daly. I carried out the build but I got a bit stuck, Chris very kindly finished it off and used it as a bench model to carry out some new work. I've always been thoroughly impressed with it, and it has been up against some stiffy competition.

[Arkless Electronics]

IMO the best possible way to make a passive is to use a switched attenuator. The units from Khozmo are very good and he supplies complete passive pres or just the switched attenuators. I would take such a passive pre over any unit involving any other techniques such as switched auto transformers or LDRs.
The latter two have their followers but IMHO the colourations and distortion they add in comparison to a straight attenuator are themselves the reason some prefer them..... I like my fidelity as high as possible

[RothwellAudio]

IMO the best possible way to make a passive is to use a switched attenuator... I would take such a passive pre over any unit involving any other techniques such as switched auto transformers or LDRs.

Yes, I agree. I think the main attraction of the "alternative" approaches is that they're different, they're unusual and therefore they aren't mainstream - that makes them very appealing to those who believe audio nirvana lies well off the beaten track and must be sought via esoteric means. However, I believe that sometimes the simple solution is the best.

[Sovereign]

Yes, I agree. I think the main attraction of the "alternative" approaches is that they're different, they're unusual and therefore they aren't mainstream - that makes them very appealing to those who believe audio nirvana lies well off the beaten track and must be sought via esoteric means. However, I believe that sometimes the simple solution is the best.

I can't agree with you Andrew, I wasn't appealed to LDR as it's 'off the beaten track' or whatever you were on about. When several pre amps were compared, the LDR sounded better to me plain and simple. I wasn't looking for something 'different or unusual' it was merely a simple case of amp comparisons. I not an easily led numpty banana , where is a banana emoticon when you want one .

[British high fidelity]

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[British high fidelity]

Having just had a 4 input LDR pre made by Chris i can agree with soverign,

The sound of LDRs is very very good, I have had the famous krell KRC and many other SS pre’s and also just moved on from the Prometheus TVC, and it for me is the search for unclouded, uncoloured pure high fidelity sound

Isnt pure Hifi sound our goal, reproducing that live or studio recording in our living rooms

Cheers

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[macvisual]

Sorry, what does LDR mean...?

British High Fidelity, how did you find listening/auditioning the Promitheus Audio TVC pre-amp...? What would better it do you think..?

Regards;
Peter