I'm looking to make a preamp from scratch to drive a pair of MC30s. Would anyone have a suggestion for a circuit? I really just need it as a phono pre with maybe some simple tone controls.
I built the preamp from DIYaudioprojects.com I used primarily recycled parts, all of which i sourced and soldered together into a nice little line stage. I am very happy with it and I am planning on building the RIAA phono pre from the same designer. If desired, tone controls can be added but I would build it as is and see how you like it first. It uses 12AX7A variants so tubes should be no problem to source or roll. If you are handy at all you can make these little things perform. Hope this helps.
Have you tried with the pre-amplifier of the Mullard 5-10 design?
Mullard 5-10. Ten Watt Amplifier
An externally hosted image should be here but it was not working when we last tested it.
Mullard 5-10. Ten Watt Amplifier
My first decent system had a pair of mc30s. For me they had plenty of power with just a passive preamp. Maybe just build a phono preamp and box it with an attenuator and an input selector. Check out the Simplistic njfet riaa by salas.
Evan
Evan
This looks like great project. I might do this. This is for my phono setup however. Will I need to incorporate RIAA circuitry somehow?
The Mullard is certainly classic, but not really a preamp in the modern sense of the term. It's from the days of ceramic phono cartridges, crystal AM tuners, and a very high required sensitivity. Today a preamp, for those who still spin wax, has two parts, a phono equalizer (that brings the tiny output from a modern phono cartridge up to line levels) and a line stage (that selects between various line level sources, has gain control and sometimes tone controls, and usually has some flat gain of its own, maybe 10 or 20 dB).
For DIY and especially for a first project, these might be considered to be two separate gigs. As has already been suggested, the line stage might be made "passive", without a gain stage, just to get your feet wet, leaving room to add the gain if desired later. The MC30 has a high sensitivity, so is a good candidate for this.
A good phono stage is much more difficult to get right, so might be saved for later. Just some thoughts.
All good fortune,
Chris
For DIY and especially for a first project, these might be considered to be two separate gigs. As has already been suggested, the line stage might be made "passive", without a gain stage, just to get your feet wet, leaving room to add the gain if desired later. The MC30 has a high sensitivity, so is a good candidate for this.
A good phono stage is much more difficult to get right, so might be saved for later. Just some thoughts.
All good fortune,
Chris
Trafomatic phono reference one apparently is wonderful. One of my next projects. Schematic on sixmoons.
Sent from my GT-N7000 using Tapatalk 2
Sent from my GT-N7000 using Tapatalk 2
As a starter I'm thinking of building Eli Duttmans' version of the RCA phono schematic.
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A phono preamp is not a simple project. Definitely look before you leap.
JMO, the tweaked RCA setup is good, without being highly complicated. Those folks who've built the setup are happy. 😉 I've uploaded a graphic for a cost effective PSU that's quite suitable.
Contact member Jeff Yourison to obtain the benefit of his construction experience.
JMO, the tweaked RCA setup is good, without being highly complicated. Those folks who've built the setup are happy. 😉 I've uploaded a graphic for a cost effective PSU that's quite suitable.
Contact member Jeff Yourison to obtain the benefit of his construction experience.
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