Merlot - Black Top and Black Sable EL34

This is the first of the Merlot range I constructed. In this build all switches, controls and connections are on the top plate. The paint used is an epoxy enamul and forms a tough and textured finish. Modular design was developed in this first "proof of concept" build. Once again component-2-component construction was used in forming the modules.

This amplifier diplays all the mid-range fine grain clarity of the second build (above). A number of different valves can replace the EL34s used in this amplifier. Matched Black Sable EL34s are installed in the amplifier above.

Merlot - Black Top EL34

With the Merlot - Black Top build the valve sockets were recessed into the top plate.Therefore valves with large basses e.g. KT88 could not be installed. This issue has been corrected with the second build and now all bases sizes can be accommodated. Fortunately the amplifier sounded excellent with the EL34 Back Sables. This amplifier has also delivered excellent music with 6V6 Black Glass (original Australian made valves).

Merlot - Diode Rectification Module

As with all retro-thermionic amplifier sections each part is modularised but no module contains any wire other than the component wire. The Diode Rectification Module is a full wave rectifier employing the centre tap of the large power transformer. A large 10H choke is also used as part of the rectifying and power smoothing network. When a large choke is used to reduce hum and noise in the amplifier smaller filtering capacitors can be used. Smaller power capacitors produce a better detailed mid-range this is one of the better traits of a SE UL design.

Wiring between modules is of the free style method. Copper hook-up wire runs the shortest and safest path to the next module. Internal wiring is loosely banded together for safety and to ensure minimum cross talk. By using the shortest wiring path, total signal path length is kept to a minimum.

I can provide these rectifier modules, or any other of the retro-thermionic modules, for the individual who would like to assemble their own valve amp. E-mail me for a quote.

Twinings Tea Box Preamp with Remote PS

The Twinings Tea Box preamp is very much retro-thermionic. Always the mix of timber, metal and valves presents, not only a strong retro feel and unique images but very much a desire to get back to listening to good music the way it was meant to be. Controlled resonance qualities in natural materials can add a certain earthiness or natural tone often amiss in modern, commercial audio equipment. One of retro-thermionic's goals is to construct audio components in a novel and organic way, most often using timber, Bakelite or metal in audio component construction.

The inexpensive Twinings Tea Box provides a natural looking enclosure in which to construct a preamplifier using high-end and carefully chosen components. To further add to the lofty concept of the build a remote, valve rectified, power supply was added. In the image you can see not only was valve rectification and enclosed choke filtering used but a rare Australian made 5Y3 rectifier valve was also employed.

The chassis, on which the remote power supply is constructed, is die-cast Al. Hammond enclosed power transformer and 10H choke sits atop. Other electronics are housed beneath the solid chassis, which, like the preamp itself, reside on solid brass cones. Connection between preamp and associated power supply is via a high voltaqge short cord and XLR plug.

The Jensen copper, paper and oil capacitors and associated components (including the enclosures) make this a unique sounding andlooking preamplifier. Either coupled with a solid state power amplifier or a valve power amplifier this original almost conceptional preamplifier offers an exceptionally unique insight into electronics and audio reproduction equipment not seen in commercial units. And for the engineers amounsgt us the distortion figures fall below 0.05%. The musical rating figures: 99+. Listen and be convinced.

Twinings/Jensen Tea Box Preamp

Jensen copper, paper and oil capacitors from Denmark, large and all as they are, fill the small timber Twinings Tea box preamplifier. Two preamp component-2-component modules are joined to the input and output gold RCA connections via pure silver wire. The wire is prepared by covering pure silver wire with heat shrink. French Solen capacitors form part of the feed back network. Both capacitors have pure silver leads. Expensive components to produce a very natural sounding, high detail valve preamplifier.

The timber enclosure is lined with bituminous Al foil. Alps attenuator is topped off with a heavy 4oz solid brass knob. An external valve rectified power supply delivers a very quiet 260 volts to the Tea Box components. Golden Dragon 12AX7 valves are installed but any similar valve can take its place. A truly unique preamplifier and part of the retro-thermionic range.

Twinings Tea Box Preamp PS and 5Y3

Fortunately I have been able to acquire a number of Australian made rectifier tubes. This one being a 5Y3. When purchased today a much difererent looking tube. The 5Y3 and 5U4G(s) I now own are all in excellent working conditon. Most looking at 50 years of age with many years of service behind them.

If any single component is going to make an impact on the overall sound eminating from your speakers, it is your preamp. Many hard core audiophiles "roll" (change) thier rectifier valves to change the tonal balance and voicing of their system. This may engender a more natural and sonic balance.

Well aged Australian made valves and exceptional sounding Danish capacitors, in a light timber box, with a remote valve rectified power supply. Not only good sounding but who else has one. retro-thermionic.

Twinings Tea Box Preamp rear view

As with the Merlot power amplifier the Tea Box preamplifier can have switchable inputs. The power from the remote power supply is delivered by a fix cord which terminals on a metal XLR plug. The power supply has a XLR socket to connect the two sections: preamplifier and remote power supply.