We are always on the lookout for good headphone amplifiers and here is a great simple tube design that will work with a wide range of headphones. This tube headphone amplifier design comes to us from Bruce Heran. The tube headphone amplifier is designed along the lines of the Oddwatt power amplifiers with the exception that this headamp does not require a driver stage. The headphone amplifier uses only one 6DJ8 tube per channel in a push-pull configuration. All the circuit gain is in the single output stage.… Read the full article
Mono Block Ultra-Linear Class-A Push-Pull EL84 Tube Amplifier Project
Recently Bruce has been enjoying his PoddWatt amplifier and the EL84 tube sound that he has revisited the original OddWatt amplifier project, tweaked it and put together an improved EL84 push-pull amplifier. Like the previous EL84 projects the Mini Block amplifiers use a EL84 self-inverting push-pull output stage that is biased into class-A operation. The big difference is that the amplifiers are built as mono blocks.
|Mini Block Push-Pull EL84 (6BQ5) Valve Amplifiers|
|Interior – Mini Block EL84 Push-Pull Amplifiers|
The input circuit is a 5751 SRPP. The ouput uses the ultra-linear connection and output power was 5.8 W @ 2% distortion and less than 0.25% at 1 W. The measured frequency response was 10 Hz to 44 kHz within 0.2 dB. Bruce reports that the Mini Blocks have slightly more output power than the Poddwatts and seem to have more detail while retaining all the good characteristics of the stereo Poddwatt amps. Full details are available on the Mini Block Ultra-Linear Class-A Push-Pull EL84 (6BQ5) Valve (Tube) Amplifier Project page.… Read the full article
Fostex FE206En Double Bass-Reflex Speakers
Fans of low power tube amps love high-sensitivity full-range drivers like the 200 mm Fostex FE206En and with good reason. The drivers are relatively inexpensive, they sound good and they do not require a crossover. The main reason for the fan fare is because of their high sensitivity (96 dB / 1 W / 1m), which makes them ideal for use with very low power amplifiers. However, the high sensitivity and wide frequency bandwidth of the driver come at a cost – a very low mass paper cone and a tiny excursion (Xmax=0.8 mm). This adds up to mean that extracting bass from the Fostex FE206En is often a challenge.… Read the full article
Announcing the arrival of the new Tocaro 45D Loudspeakers from Gütersloh, Germany!
We’ve been offering the Tocaro 40 Loudspeakers since 2008 (Austin Hifi is the U.S. importer and distributor), so naturally we were very excited to hear the new D-Series drivers (which are now standard-issue in The Tocaro 45D, The 42D and the 40D Loudspeakers.… Read the full article
Beck has been doing a cool project called Record Club for a while now. He gets some friends together in the studio and records a classic album, then releases a video of the performance on the internet.
This time out, Beck has rounded up St. Vincent and The Liars, plus a few extras and recorded the album “Kick” by INXS.
Other Record Club outings:
The Abscisse, a terrific new loudspeaker by the renowned JM Reynaud is being introduced this year by JM Reynaud importer/distributor Bob Neill’s Amherst Audio.
Amherst Audio will be in room 561 at RMAF 2012.
|stereo 100k 24-position stepped attenuator|
This time, I wanted to mention an amazing video of the Earth that was shot from the International Space Station.
I noticed Italy and Sicily, then Egypt with the Nile Delta, plus several Aurora. There’s a page at Starship Asterisk where members have created a guide to what you can see in the video. I noticed a bright, orange squiggle that Starship Asterisk members identified as the India/Pakistan border.… Read the full article
Here’s something you don’t see every day: a 1939 RCA Storytone Electric Piano. The piano is listed on Ebay for $250,000, but there’s a “make offer” option, so maybe you could get it for less if you’re interested. It’s a real Art Deco beauty. The Piedmont Piano Company in the Bay Area has a nice page with some information and additional pictures of another Storytone Piano.