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Out of curiosity, i have been surfing the web about this. I couldn't find much information: only 1 mfr (Gamut), no tube mfrs, and no justification for or against them.
Any input appreciated.
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Do you actually Need? a pre.
Unless using vinyl.. which likely has it's own dedicated Phono pre (or should have).
What would be the purpose of a Pre.. In the 21st Century.
Switching inputs perhaps.
A simple passive can be far more transparent than Any pre.
(please.. spare the righteous indignations)
If Impedance matching of a passive is a concern? then a Pass DIY.com Buffer unit is a truly excellent and V inexpensive solution.
Just curious.
I once had a friend that used two Lamm L2 Reference line stages (both are stereo, but he used the only left and right channel on each individually, in a quasi-mono configuration), yes speciality audio can be truely nuts
Along with Conrad-Johnson, you also find LAMM and Audio Research. Click here for a view of their dual chassis REF10.
Not only is the power supply dual mono, it has separate transformers and supplies for the high voltage (audio) vs. low voltage (display and switching) sections. An R-Core tranny is used for audio with a massive capacitor bank you'd normally find with a power amp.
I was talking about two mono preamps, not dual mono. There are many mfrs of the latter.
The GamuT example you began with does not fit that bill.
Click here for an internal pic of its single box.
I'm thinking the mono music system market is rather limited for new production. :)
One would have to research a lot of companies to find the buried stats caiming 'dual mono' design (inside a single box, or separate power supply).
Plenty of separate power supplies.. I own three preamps with separate power supplies.. And I actually do not know if they claim dual mono internal design inside the preamp guts box. But I would guess most high end manufacturers would make some claims to a dual mono construction. Just to get crosstalk stats down.
I would think/guess the op really only wants dual mono with separate mono boxes. One box per channel.
Adding in circuit designs which claim dual mono internal construction leaves a huge field fraught with design skimping and outright lies in a true dual mono field. Separate boxes leaves zero chance for signal interacton.
One would have to research a lot of companies to find the buried stats caiming 'dual mono' design...
I simply google internal images for units and usually find them.
But I would guess most high end manufacturers would make some claims to a dual mono construction. Just to get crosstalk stats down.
Are you suggesting that *most* of those are misrepresenting the product with specious "claims"? It is far too easy to verify.
Adding in circuit designs which claim dual mono internal construction leaves a huge field fraught with design skimping and outright lies in a true dual mono field.
Perhaps. Fortunately, I purchase gear from well known and established companies like Audio Research where there is certainly not any "design skimping".
As for the GamuT unit first discussed, it may be dual mono but it appears to be fully op amp based. I do consider that "design skimping". :)
aa
"Once this was all Black Plasma and Imagination" -Michael McClure
A number of companies made dual mono preamps. Separate channel mono preamps.
With separate chassis for each channel.
Some had a third box for the power supply!
Typically they were the top of the line preamplifiers. So really expensive, and state of the art.
I personally would LOVE to own the Conrad Johnson one...
ART - Anniversary Reference Triode Preamplifier
Mmmmm tasty!
Krell KRS-1.
Heard this monster ahead of 6 Krell KRS Reference amps driving a pair of Apogee Diva's back in the day. LOTS of heat, but great sound!
This would have been late 1987 or early 1988 at Hudson's Audio in Albuquerque, NM. 7611 Menaul Blvd, for those so inclined (if they are still there) - the entire listening experience is forever etched into my brain. :)
.
I'd just say? The listening sessions I had there made me a "fanboy" of Krell, Apogee, and the B&W 800 series.
To this day, I haven't owned any Krell products, but have had & loved some Apogees, had & currently do have some B&W 800 series.
I was looking to see if you had a system posted, noticed the Wisconsin connection.
I got a really good deal on a CT5, about a year ago. It's No ART, but it is the best preamp I've ever owned.
A preamp with a mono switch, one with a separate circuit for each stereo channel or , literally, a preamplifier with only one channel?
The Gamut product cited by you is not mono. It is stereo but with separate circuitry including power supplies for each channel i.e dual mono, as more typically found in power amps. Ironically there is no mono switch or other mono capability for signal handling.
I seem to recall there is at least one phono pre-amp that is purely mono but that is specifically made for 78s with appropriate equalisation. Nothing else comes to mind if you really want mono per se.
Two, identical mono preamps. One input, one output per preamp.
It wouldn't be hard to find a builder, but it was hard to find any commercial offerings.
You might take a look at some of the Vintage offerings-
there many of the components are Mono, and having two would be easey-
Yes, they might need to be refurbished - but that could also be to your advantage -
I am thinking of something like a pair of McIntosh C-8 pre-amps- that have switches which could provide flexibility for RIAA/NAB, & other record EQ curves - 3 12AX7s per unit-
Happy Listening
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