Tubes4hifi audio
Rated VDC. Higher on VAC. The M is incredibly good value in today's insane HiFi Jewelry marketplace. It's not pretty or child safe, but is sonically very good. It's not as recessed as the PL5 nor as forward as the ST As always, YMMV.
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High gain amp kit
Made with Xara. This modification is something I developed for my customers only. Sorry, but this is what sets my gear apart from the kit versions.
This is the only version I am building because it is the best. My latest and greatest version features OLED display and relay input switching. It can only be built in the cherry or walnut case. The special model has every option. It cannot be built in the black alumininum case. The base capacitor value is 0. The 0. I have eliminiated the channel level attenuators.
This is the best sounding version of my preamp. The only electrolyic capacitors are in the filtering for the regulated 6 volt DC filament supply for the tubes. The entire signal path now has only quality film capacitors. Also, all my preamps have my new mod that allows you to use the 6BY5 rectifier types as well as the 6X5GT. Sounds better and I give you one of each with the preamp. I am not alone in my opinion of this preamp. I have gotten two very nice reviews lately from customers who have them.
They are too long to post at the bottom of the page so I have created a customer review page where I post feedback.
There is also a thread going on Audio Circle about the preamp. This is the old back story I have improved things considerably since this was written : When I built the first one of these preamps, it was the first thing I had ever heard that I thought was every bit as good a piece of gear as a fully restored Citation II amplifier.
Really, this preamp is so good that it is scary. You can read my initial listening impressions from a few years ago here. The preamp is based on the 6SN7 tube, which has always been one of my favorites. The bigger octal tubes like the 6SN7 have a much more relaxed, fuller, and richer sound than the smaller tubes like the 12AX7, 12AU7 or 12AT7 tubes used in many other preamps.
You get all of the detail with no brightness. The preamp is based on the SP14 board from Roy Mottram. My price has risen because I have kept improving the parts and design and made all the options standard.
It is a cost no object design without all the ridiculous markup and hype of the high end industry. I have spent numerous hours experimenting with parts choices based on my many years of experience restoring vintage tube gear. I know what parts sound very good in various positions in the circuit. This preamp is incredibly good for a number of reasons. First, the audio circuit itself is a wonderful, but simple design that has a very short signal path and really only one coupling capacitor per channel at the output.
The tubes are direct coupled. The 6SN7 is a fantastic audio tube as noted above. If you are used to the sound of small tubes you are in for a treat, and you most likely will never go back.
Second, the power supply is a fully dual-mono design. This gives amazing stereo separation because each channel is independent. The two filament supplies one for each channel use ultra-fast schottky diodes, and then the filament voltage is regulated by a low-noise, low-impedance device that is completely isolated from the audio signals by floating the 6 volt supply about 70 volts above ground so there is no hum whatsoever.
The 6 volt DC regulated filament supplies are driven by completely separate transformer windings for each channel. In fact there are separate filament and high voltage transformers.
The power supply and filament supply design gives stunning channel separation and the blackest background that I have ever heard in ANY preamp, tube or SS. My version uses a wooden case with the tubes on top. That helps it run very cool and it will be reliable for many years.
Plus you can easily swap tubes. I use full aluminum front and rear panels to allow easy mounting of controls and jacks, and also to keep the signal path parts well separated from the AC. All signal wiring is done with Duelund tinned copper stranded wire. It is the same wire I use in all of the Citation II amps. All the signal path resistors have been chosen for the best sound.
It is dead quiet and incredibly dynamic. The other electrolytic caps are all very high quality Nichicon or Panasonic 10, hour degree rated capacitors.
The volume control is a 64 step Khozmo remote controlled attenuator. It is built with very low noise resistors and there are only two in the signal path, one per channel, at any one time. I have used Gold Point attenuators and they sound very good. The Khozmo is much better. The preamp has two sets of output jacks, each can be driven by their own pair of output capacitors, or the two can be in parallel and driven by one set of caps.
The basic version of the preamp will come with a very nice 0. This cap combo rivals most anything you will hear at any price. Most every tube power amp around is K or higher. If you need to drive a solid state power amp with a lower input impedance I can use larger output capacitors. For example, the 1.
I have sent over 80 units out to customers and these are their comments from the first three: Mark from Sacramento: Moment by moment, the sound of this preamp is revealing its magic with absolutely zero detractions.
Among its attributes, I am stunned at the black background on silent passages in music. I prefer this preamp to the Citation I preamp you modified for me in the past and and the C-I is a fantastic preamp. A SS preamp could not be more quiet. The dynamic extention is breathtaking. I am eager to have my fellow Bay Area Audio Society members give a listen to this fine preamp as I think the members will not fail to appreciate the accuracy and sonic attributes of this modestly-priced preamp.
No question, this is a stunning preamp as I hear it more. I think that like fine preamps, it is ruthlessly revealing. The ability to use balanced inputs from a DAC raises the performance of this preamp to a higher level. I think there is some magic in the 6SN7 tubes that almost no other preamp designer uses. Don has listened to a variety to 6SN7 tubes, the result of which he has optimized the sonic signature of this preamp with the tubes he supplies — no need for expensive tube rolling with this preamp.
I have had a dozen tube and SS preamps in my system over the past 45 years and this is the most pleasing preamp I have ever heard. One could spend 5XX the price of this preamp and I suspect would not find their performance exceeding what what Don has created. I turned it off one night. All other nights I just turned off the amp and let the pre cook. It continues to improve or my ability to listen to it appropriately improves.
The improvement is not subtle. Overall, the system is now presenting with extraordinary fidelity … breathtaking dynamics and transparency … combined with a rich and colorful tone. So easy to listen to and so easy to be drawn into whatever performance is playing. Thank you Don. Jose L. After contacting Don, very friendly and he knows his stuff. He answered all my questions and fears about tube amplifier. This preamp produces the finest and incredible audio and I cannot imagine getting this quality sound for the price.
Thank you for giving new life for an old hobby Warranty: This preamp should be totally reliable. So I will guarantee it for one full year. If anything goes wrong exept for a tube I will pay shipping both ways, fix it, and return it for free. If a tube that I supply fails in 90 days I will replace it. Now if you have a party and someone spills beer on it then I will fix it for you as cheaply as possible, but the cost is on you.
Realistically I would expect this unit to be trouble-free for many years. If you get a problem more than two years down the line and you pay the shipping I will fix it for only the cost of parts, forever. I am not into snake oil super expensive boutique parts, but this cord has won me over. Richer, deeper sounding. Other options are possible. I can use any output capacitors you wish. Just contact me to discuss your needs. Vintage Tube Audio Restoration and Repair.
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Official Page. The collection includes 67 patches containing over deep-sampled phrases organized for song writing ex. Record live audio. If you don't, please contact us using our support form and we will send it manually. The company is highly regarded world wide as a reliable seller of top quality secondhand items too. All of the classic tone and digital destruction of the original plus tons of new useful features, this is the most powerful pedal WMD has made to date. Extra 2 Months Free!
Tubes4Hifi kits?
My recent "adventures" with eBay have caused me to recoil from buying tape decks for a while and focus my attention elsewhere. I have always wanted to run my Martin Logan Prodigy's with either a pair of big Krell monoblocks or Since I would only be using these amps in the 80Hz and up frequency range I have a pair of subs , I think this would be more than enough power for me. I realize this is an old post but for the benefit of anyone else considering these I can offer a few comments. Firstly kit quality is very good. Nice high quality heavy gauge SS chassis, quality components throughout. Skill level needed is moderate, as long as you know how to solder and can follow directions, which are excellent, you shouldn't run into any issues. After sales support is excellent if you do happen to run into an issue.
Tubes4hifi sp14 preamp
Made with Xara. This modification is something I developed for my customers only. Sorry, but this is what sets my gear apart from the kit versions. This is the only version I am building because it is the best.
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Discussion in ' DIY ' started by sphinxvc , Dec 25, Super Best Audio Friends. Read these "rules" AND introduce yourself before your first post. A healthy approach to understanding measurements Being true to what the artists intended. Tubes4Hifi kits?
Dynaco PAS..Comments please...
AC30 Custom. The tubes that are in the unit are factory KT's and 6SN7's. Aug 19, 2. I wanted to inquire about tube rolling. Also, I guess I'm a little bit old-school: tube-driven amplifiers with point-to-point wiring; vinyl, preferably early pressings; spun with belt-drive or idler. I've been playing for around a couple of years, up to now only through software amps. The forum to ask questions and get information about Allnic, a company that manufactures high-end vacuum tube amplifiers,line stages and phono stages. The output transformer's primary impedance is 3.
This is the finest preamp that I have ever heard!
The sound of the amplifier throughout its Pair of rebuilt tube mono block amps. The tube compliment consists of 2 , 1 B and 1 6SL7. The VTA M amplifiers are available both as kits and as fully-wired, ready-to-play products. EVO Poweramp.
Monoblock tube amp
These are just a few thoughts I wanted share on the subject. Thanks for reading. LOG IN. Reviews on the Tubes4hifi's SP14 are consistently positive and so many people are blown away by them.
Sources dealing with transformative constitutionalism. It is a line stage preamp, but does not have a tape loop. The preamp sounds better than preamps at several times the cost. Stent la inima pret Tubes4hifi sp14 preamp. Gm entry level information technology interview. Spiertrekkingen arm.
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