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I wish to thank Kev and Byron from Group DIY for test-piloting this project, and for their changes and comments on the original design. Take a look at how Kev Ross builds this project Kev and Byron's page on building the Gyraf G9. The G9 contains two channels of real-tube, high-gain, transformer-balanced microphone preamplifiers with additional line and instrument inputs and transformer balanced output. The signal path contains only tubes, transformers and passive components, to preserve your signal integrety. As you can see from the schematic, the G9 is really a VERY simple, no-nonsense tube mic pre. Note that OEP's HAS to be in screening cans, including the output trafos (that are not canned on the pictures, sorry). The secondary of the input trafo is taken through a switched "instrument" jack plug on the front of the unit. The input gain stage is pretty much a standard feedback gain-controlled circuit like the ones used in all old tube audio gear. The only tricky part in this is the gain switch, normally divided into one feedback switch and one attenuation switch.. On the highest gains - the steps 5 through 11 on SW2 - attenuation resistors R19-22 are taken out of circuit, and AC cathode-to-ground shunt resistors R13-18 (1K-100K) becomes active, rising the gain.
The now gain-controlled signal is taken to the high pass filter, a simple passive 6dB one around C8,9 and SW3 - and then to the "output gain", a 47K log pot feeding the output driver stage. The output trafo is wired 2:1 to get the 2400 Ohms Zout of the SRPP stage down to around 600 Ohms. The output of the transformer is taken to SW4, the phase reverse switch, that has 10K resistors across it to control transformer load when switching.
The output voltage of the regulator is set by the ratio of R34 and R36+36, to about 245VDC, keeping us within the range of 250V capacitors. The 48V phantom is also relatively straight-forward: It's a zener regulated design, adjustable with PR1, and fed from a voltage tripler running off the 15V that goes from the first transformer to the second. All components should be easily available, and the unit requires no other trimming than the phantom voltage set to 48V.
As always, the track side is shown mirror'ed - as seen from component side - for better copying onto photoresist PCB's. The main board is straight-forward, but the smaller control PCB has to be cut into three sections; two sets of front-panel controls and one (BONUS!) spare HT+Heater voltage PSU for your further tube experiments.
If you let me know how you're managing this project - and if you have information that could interest other diy-people - I could link to it, or I could put it on this page. Nadat de T550 bij mij afgeleverd was heb ik hem in eerste instantie uitsluitend als cd-speler beoordeeld binnen mijn bestaande audioset. Na uitgebreid luisteren naar het cd gedeelte van de T550 werd het tijd om hem in mijn home cinema set op te nemen.


Indien u op zoek bent naar een fraaie dvd-speler met alle benodigde functies en aansluitmogelijkheden, een verzorgd, strak uiterlijk zonder toeters en bellen, zet dan de T550 van NAD zeker op uw verlanglijstje. Searching the net, I've never come across a complete tube microphone preamp design, so I decided to share this version of our very popular design, the Gyratec IX. Without those guys this level of DIY-friendlyness would'nt have been even remotely possible. It also features switchable phantom power, high-pass filter and phase reverse, as well as independent controls for input gain and output level - giving the user some creative options to work with. Comments and corrections are extremely welcome, but I can't promise to reply to all mail I receive.
The line relay - as well as the Phantom power - is controlled by the front panel rotary switch, SW1: (line - mic - mic+p48).
Without it, I've had oscillation problems because of the high gains and bandwidths involved. It's gain is controlled by shunting the fed-back AC signal on V1a's cathode to ground - think of it as a opamp gain block with 47K (R10) from output to inverting input. But - you know I like the simplicity, availability and easy mounting of the "Lorlin" type switches - so I had to think a little here..
They're contained in a 510KB PDF-file to maintain scale - just remember NOT to use the "fit to page" option in acrobat when printing.
The set consist of two pcb's, one 15x21cm - the main board, and one 10x16cm, the control board.
This is both because the space was there anyway, and because I think that the hard thing getting started with when working with tubes is - the powersupply.
Omdat de T550 splinternieuw was en zo uit de doos kwam heb ik hem eerste een aantal dagen op "repeat" gezet om lekker "warm" te draaien.
Hievoor werd mijn eigen Sony S335 dvd-speler losgekoppeld van de Philips real flat breedbeeld tv en de Oehlbach SCA2000 scartkabel in de T550 geprikt. Zoekt u een combi apparaat om zowel uw bestaande cd-speler in de prijsklasse van circa Fl.1000,- te vervangen en een dvd-speler aan uw set toe te voegen?
It is a classic, conservative design, that easily matches the performance of even the most expensive and esoteric units I've been able to compare it to. But as we are not purists, we incorporate modern semiconductors in the powersupply sections - simply because this is way the easiest, cheapest and best solution available. In "The Lab" - a forum on GroupDIY.org - there will surely be people that can and will answer most of your questions regarding the design, construction, and sourcing of parts. Gyraf Audio shall not be responsible and disclaims all liability for any loss, liability, damage (whether direct or consequential) or expense of any nature whatsoever, which may be suffered as a result of, or which may be attributable, directly or indirectly, to the use of or reliance upon any information, links or service provided through this website. And we like you to stay alive and well, so you can help other people sharing our bizarre interest for building retro-pro-audio-equipment.
The G9 powersupply takes an average of 15 minutes to come down to non-dangerous voltages, providing that the tubes has had a chance to get hot.


You can now control the circuit's gain by shunting the inverted input to ground - through a cap, C7, because we don't want to disturb the DC cathode potential, made by R6 and R7, setting bias in V1a. I've had very good results using this output stage topology in all sorts of designs - it's simply my favourite tube circuit. 120V in-to-out differential voltage, so the three 39V zener diodes (D3-5) protect it from voltages higher than this.
Note that the 78S12 regulator dissipates quite a lot of power - around 5W - and MUST be mounted (electrically isolated) on a good heat sink, preferably with thelmal contact to the chassis.
The two primaries of the second transformer should be connected in series, to bring voltage up to around 220Vac. The spare PSU is just because I had the extra space anyway, and I find that having extra HT+ Heater PSU's laying around greatly helps tube creativity. For power amplifiers there's quite an audible reason to use tubed power supplies, but for preamps I haven't been able to spot any advantage so far. If you build this project and describe elements of the process, I'll be more than happy to add it - or a link to it - here, so others can benefit from your experiences. Also the 1N4004 (D2) protects it from lower voltage on the input than on the output, a condition it hates.
Na een weekje ben ik begonnen met het eerste serieuze luisteren naar deze speler, het eerste wat opvalt is dat de T550 even tijd nodig heeft om de inhoudsopgave van de aangeboden cd uit te lezen maar hier wen je snel genoeg aan. It would also be possible to mount the 78S12 on three (short, heavy) wires, and bolt it to the chassis back - electrically isolated. Waar je ook snel aan went is de geluidskwaliteit van de T550 deze is namelijk absoluut goed te noemen, we praten hier tenslotte over een dvd-speler! Het center kanaal klinkt duidelijk rustiger en is beter verstaanbaar, surround effecten zijn duidelijker te volgen. Failing to heatsink the 78S12 appropiately will result in thermal shutdown - you'll loose the 12V lines whenever the unit heats up. Ook in gewoon stereo klinkt de T550 buitengewoon, de Hell Freezes Over dvd van de Eagles klinkt fraai waarbij de verschillende gitaren in Hotel California onderling goed te volgen zijn. Deze en nog veel meer andere mooie componenten zorgen ervoor dat de T550 audioprestaties van formaat weet neer te zetten.
Luisterend naar de Unplugged cd van Eric Clapton wordt een prachtig breed en diep stereobeeld neergezet met veel warmte en detail en pas bij intensief doorluisteren komen er marginale verschillen aan het licht ten opzichte van mijn eigen Tjoeb SQ buizen cd-speler. Iets minder microdetails en een bescheiden kleuring in het middengebied, maar let wel de NAD zit in een gelijk prijssegment en heeft dan ook nog de mogelijkheid tot het afspelen van DVD!



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