6N3 + TDA7294 integrated amp.

A completed tube and chip integrated. Fast and crisp. Absolutely dead, dead quiet thanks to CMRR. 80Wpc, 300VA power tranni, choked power cord, rodium RCAs, RFI/EMI power filter, heavy duty speaker binding posts and 2U 19” rack mount. At the members request a low filter switchable cut of 6db at 150hZ. Also a 24 step step attenuator. 

“Piccolo Pro” - 6J1/5654W small tube preamp

 

A new 6J1/5654W tube preamp nestled into my system. Sounds as good as the last one which sold. Upgraded this build here with wood cheek chassis, three inputs and remote control. Colour is Ocean Blue hammer tone. All silver plated copper wire for hookup. Called this one “Piccolo Pro” due to the upgrading from the original Piccolo. 
 

Perfect at first switch on. I have both 6J1 and the higher performing JAN GE 5654W tubes. Much better with the JAN GE 5654W tubes. Works with a 12VAC 1A wall wart. 

“La Technique” - French made 1957 EL3N power amp

 

Inspired by the look of these vintage French made EL3N tubes - NOS NIB - with their red cumberbun and rarity I was compelled to build an amp. Also looking for something a little different I built on a Hammond wood cheek chassis. I already had the external PS with tube rectification from my “Xfi” amp and had listened to these new tubes in a 6L6 amp. 

Staying with a traditional black look with classic wood cheek sides and the showy tubes in black and red this amp was always going took stunning. The OPTs are 5K Asian and add that to German Mundorf Supreme interstage caps on a Canadian chassis you have a true international components mix. The driver tube is a new Svetlana 6N1P, resistor selection is carbon and metal film with wire wounds for Ck. Also a mix of NP and standard electrolytic caps with all Cat5 solid core hookup wire characterise the sound. 

Compared to my many SET amps, “Xfi” being a good example, this amp has a fuller, richer, bassier sound. As with all my other SE UL pentode amps this one has PRaT. I find drive and rhythm a hall mark of pentode based amps and “La Technique” no different. I love the look and are ecstatic about the full bodied sound. Add to this the amps heart is French made vintage tubes is a bonus. 

“Piccolo” - 5654W compact tube preamplifier

 

This smart looking and compact tube preamp uses (matched) JAN GE 5654W tubes. The kit is sold with lesser performing 6J2 but here they have been upgraded. The enclosure is Hammond extruded anodised Al smart looking enclosure. Three inputs are selected by two front switches. The black knob is a large anodised Al type with a good feel. All internal components are of very good quality. 
 

Power is via a 12VAC 1A plug pack and connects to the preamp via a two pin locking connection. Internally HT is generated to produce a dead quiet preamp. Under test up to 90% max volume there is 0.0mV of noise. At 100% volume, 0.4mV of noise. Input impedance is 100K. The blue colour when on is a pleasant glow and the filaments fire is also easily seen. Tube rolling is possible. 
 

From such small tubes I didn’t expect how good sounding this preamp could be.

“Iron Stone” - OPAMP based MM RIAA phono preamp

 

I bought the last six Jaycar LM833 dual OPAMP based MM phono stage kits. This is the very last. Two were resold and four assembled and three sold so far. Where the previous “Player” was enclosed in an expensive Hammond extruded anodised Al enclosure this one cleverly hides in a strayed plastic enclosure. Colour is Iron Stone and thus the name for this final build. The paint is durable epoxy enamel on an etching primer. 

The last two builds are powered by an external 12VAC wall wart. There is excellent power filtering and +/- 12V regulators on board to ensure a dead quiet MM phono stage. The RIAA EQ is a mix of passive and active plus there us a buffer gain stage. The front knob controls gain not volume though more gain means more volume. Input impedance is 47K. Internal components are most NP caps and metal film resistors. The inside of the enclosure is heavily lined with bituminised Al foil which is earthed. The foil shields the inside from stray electrical interference and the bitumen damps any resonances. 

Overall the sound is transit quick, very clean and extremely detailed. The LM833 OPAMPs have bipolars transistors throughout which provides a rich warm tone though any similar OPAMP can be used. For example an OPA2134 can be dropped in. I find this FET/bipolar OPAMP not as warm and the bass not as full. Im staying with the LM833. 

“Horizon” - Custom SRPP preamplifier

This build centres around the 12AX7 tube and a SRPP schematic I have used a number of times. The custom part is a remote control which I have never used before. The motorised Alps Blue Velvet pot comes as a single unit with motor and control circuitry smartly attached on the rear. The remote is small with only volume usable. It works well but the steps are a little large and the preamp has a lot of gain.

To fix both issues I have some Tung-Sol 12AU7s coming which have a much lower gain and will allow the remote pot to be better controlled. If you pair this preamp with a power amp of low gain the X7s are a better selection. I’m very pleased with the finish which is Gun Metal epoxy hammertone. The chassis has wood cheeks and the whole appearance is understated and vintage industrial looking. 

Two inputs selected from the front switch, silver plated fine copper wire for hookup and 1uf of PIO output caps makes for a good sounding preamp. The PS is external and has a Hammond 5H choke in a double Pi configuration. Also there is 300uf of snubbed high voltage caps for filtration. A 4uf PIO snubbed cap is the final cap and situated in the preamp. This always improves overall sound. Filament voltage is DC and the preamp is dead quiet, fast and detailed sounding. 

French EL3N pentodes in a wine box amp

 

Bought a matched pair of French EL3Ns from eBay - NOS NIB but no amp to listen to them. Also bought ceramic bases and adapters. The adapters will allow you to insert the tubes into most pentode amps but ensure voltages and currents are correct. I was lucky both were close enough. 

From what I have read you should run the tubes in triode strap but for me who loves UL I left them as the amp had been wired for 6L6. In UL you get a little more power and I feel extra drive. Whatever, they sound extremely good and with one of my wine box 6L6 amps the tubes hissed but in the other (same schematic and parts values) dead quiet. You can get these tubes quite cheap but I paid a premium and again "whatever" a very pleasing audio result.