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 NEW    Bruce Heran outlines the details and construction of his simple DIY 6DJ8 (ECC88) Tube Hi-Fi Headphone Amplifier Project.

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Picture_024.jpg1930s style singled-ended pentode3782 viewsThis is a new amplifier I designed and built using mostly salvaged parts from British electronics of the 1930s and 40s. The valves are all British 4V types, AC/SP3 driver and N41 pentode output. The power supply uses an MU14 rectifier. The loudspeaker is a 1930s energized type - so it also acts as a smoothing filter.

See http://mike.wepoco.com/retro-geekery/wireless-world/1936-monodial-ac-super/monodial-psu for more information.
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6BQ5-Push-Pull-Tube-Amp.jpg6BQ5 / EL84 Push-Pull (PP) Tube Amp3772 viewsTube amplifier built on the basis of the Schematic from 6BQ5 / EL84 Push-Pull (PP) Tube Amp.
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little-amp.jpg50L6GT Tube Amplifier3768 viewsThis little guy is something I came up with when a friend asked me if there was an inexpensive, but decent vacuum tube amplifier he could build. Well, it is low cost and sounds acceptable, but it is dangerous as one side of the AC line is connected to the chassis. Yes, I used a polarized plug, but it also depends on the receptacle being wired correctly... so I recommended that he should build it with an isolation transformer.

It uses two 50L6GT output tubes driven with a 12AX7A. The heaters are series strung with a 68 ohm resistor to take up the remaining 8 volts. The powersupply uses a 1N4005 half-wave rectifier, so it was a bit difficult to filter out the 60 Hz buzz.

For something cheap, it doesn't sound half bad. Though, it doesn't hold a candle to my 6T9 Push-Pull Tube Amplifier!

-Steve (z-strat)
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SV101647.JPGOPA2134 Inside the Chip amp preamp II3732 viewsYou can see how compact the boards are. The yellow caps are MPX 0.47uF and 220uF low ESR electrolytics store power from the voltage divider network (virtual ground). Computer stand-off keep the brds. off the case and are fitted with rubber grommets to control cct. resonance and vibration. More details are available at the DIY OPA2134PA Preamplifier Project page.
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SV101485.JPGFinished Subwoofer Processor Kit3695 viewsThis analogue OP amp based sub-woofer processor provides a lot of flexibility when it comes to low pass filter adjustment, parametric equalization, sub-sonic filtration, gain and input selection in a slim neat box. But when it comes to set-up and balance with your favorite speakers, there is a lot of work to be done. The kit is from Jaycar Australia.
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Bottlehead-Seduction-Phono-Preamp-Top.jpgFinished Bottlehead Seduction Tube Phono Preamp3685 viewsA finished view of the Bottlehead Seduction Tube Phono Preamp kit.
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Nelson-Pass-Bride-of-Zen-BoZ-Preamp-Aluminium-Case.jpgNelson Pass Bride of Zen (BoZ) Preamp - Aluminum Case3668 viewsThe finished Nelson Pass Bride of Zen (BoZ) Preamplifier. Where I though the Nelson Pass B1 buffer had excellent bass, the BoZ came in and made bass reproduction even heavier. Not more extended just weightier. Mid range and treble are extended and detailed. The Hammond aluminum cases sure are smart. You need a very, very quiet PS for this preamp. Any hum just leaches right through.

There is more info and notes in the JFET BoZ (Bride of Zen by Nelson Pass) thread on the forum.


Mark Houston (Australia)
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PhonoInside.JPGPhono Preamp Ki.3662 viewsThe cct. brd was assemble and the ABS plastic case drilled ready for assemble. ABS is a very hard plastic to drill. Before assembly the lid, base and sides were lined with heavy tar and foil stick-on shielding. This helps with case dampening also. All gold RCA connections were kept to the rear (see other photos). The chips are the LM833s but the Burr-Brown OPA2134 high performance chip can be directly substituted. The on-board +/- 12V regulated PS is shielded from the rest of the sensitive cct. Additional snubbing was added to the line caps to remove PS noise and chip RF decoupling. Though three different compensation can be selected from the cct. brd by moving two jumpers the lid must be removed to do this. A double pole rotating three position switch could be added to provide this facility externally. The cct. includes a gain control which is accessed from the front and allows easy and silent level adjustment. The sound is natural with no hiss or hum. Easy to build.
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Par-Metal_Case_ICEPower_1000ASP_modules.jpgPar-Metal Case with B&O ICEPower 1000ASP modules3655 viewsThis is a high power audio amplifier project that I recently completed. The amplifier used two B&O ICEPower 1000ASP modules. Each amplifier module is rated at 1000 Watts. The two amplifier modules are housed in a Par-Metal aluminum case. The amplifier sounds amazing with my Epos ELS303 speakers.

See the other photographs.

Ed
Detroit, MI
USA
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Dons6C33C.jpgDon's 6C33C tube amp from Down Under with locally wound OPTs3650 viewsThis beautiful 6c33c amp is not one of mine but belongs to a regular customer of the electronics store I work at. The power tubes are the same used in Mig fighter jets as regulator tubes. Don has dropped one on a wooden floor, it bounced and he caught it. Tough tubes. The timber base is made by Don and the top plate is 4mm thick ABS plastic. The power transformers and chokes are well separated from the music making bits. He employed locally made horizontal power transformer, chokes and audio OPTs. The amp is musical and neutral sounding low bass is a little spongy and undefined when added to my all valve system. It produces 15W, not bad from a SET. The front tube is a Sovtek 6SJ7 and the amp is two stage and weighs 40lb! Mark – contributor.

See this 6c33c tube amplifier thread for more info about this tube.
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2120128885_d5fb1fe01d_b.jpgRetro tube amp Telefunken EL11 & EF12 + Tungsram AZ113645 viewsNice sound from years before word war II of 20th century.

see the forum: My "Retro" tube amplifier (EL11, EF14, AZ11) for more information.


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Single-Ended-833-Tube-Amplifier-Monoblock.jpgSingle-Ended 833 Monoblock Tube Amplifier3634 viewsI have built a monoblock 833 SET tube amplifier with zero feedback and a fixed bias. The total power output 125W! Here you can find more photographs: http://img200.imageshack.us/gal.php?g=img1663t.jpg
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TubeLab-Simple-SE-6L6GC-Tube-Amp.jpgTubeLab Simple SE 6L6GC Tube Amp3630 viewsUnderside view of the Simple SE Tube Amplifier using a PCB from tubelab.com. The motor run capacitor is 90uF / 370V. The choke is a Triad C-14X which is 6H 150 ohm and rated at 200 mA. This amp really runs dead silent - no hum whatsoever with my 93 dB Polk Speakers.
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IMG_1422.JPGDIY Heatsink3617 viewsNote the shape and size of the inter-connecting metal between sheets... i don know if the shape was necessary but... it was an aesthetic choice.
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EL84_PP_6E6P_driver_1.jpgThe Simple EL84 PP version 2 (on steroids) 3602 viewsThis is the second version of my first DIY audio project. I changed the Driver tube to 6E6P strapped as triode with CCS load (IXYS 10m45s - 15mA).
Current sinks LM317 at EL84 cathodes it not grounded but connected to a -24V negative power supply. That gives more gain, less distortion and gives also much more headroom for the output stage.
The coupling caps are 0.22μF PIO JENSEN. I' ll try the russian teflons in the next few days.
This tube amplifier simply rocks.
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12AU7-Tube-Cathode-Follower-Preamp.JPG12AU7 Cathode Follower Tube Preamplifier3599 viewsThis is a DIY 12AU7 vacuum tube preamp. Rectifier is a 6X5GT, and voltage regulator is an 0D3 tube.

Here are more details about this DIY 12AU7 Tube preamplifier.
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DIY-6AS7-Tube-Headphone-Amplifier.jpgDIY 6AS7 Tube Headphone Amplifier3597 viewsMy name is Laurie. I have been building and DIYing for 45 years now and happily will never stop. This tube headphone amp is from a thread in the Form.

The power connecting cable comes from a European Travel Iron I bought for $1.00 at junk shop. (220v/6A) They will be shortened when I find a perch for the amp and me. The sound is better than my ears have ever heard so I will be keeping this one for my retirement entertainment should such a time ever come. Wink It has worked from day one and continues to please me every time it is turned on. The tubes are JJ ECC88 / 6AS7 with a 5V4 rectifier tube. To spite it's small size the parts are quite easily accessed. I over built most components so it will outlast me I fear. The only change I anticipate may be the 6AS7 to a bottle neck glass to match the rectifier tube. I do have and use a 6080 tube, but i can tell no difference in sound. It will take more then a few hours of listening to get my ears better tuned.
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Seas-exotic-fullrange-loudspeaker.jpgNew Seas Fullrange Speaker3595 viewsThe new 8" Seas fullrange unit. Not much info available other than it will be release Jan 2008. The magnet does not look all that large, so I suspect it will be a high Q driver.
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TSpecialUnderChassis.JPGUnderside view of the 6T9 baking pan tube amp3593 viewsThe OPTs and printed cct. brd. fit snugly in the thin baking pan chassis making a compact little amp. Drilling such a thin chassis has its challenges and getting all the drilled points to line up with cct. brd. mounting holes can be frustrating. This amp is a poor performer under the CRO but produces an astounding stereo image. It plays small classic quartets, jazz groups and most voice and piano based music well. You need at least 90dB efficient speakers that can go deep for good listening. See the 6T9 Tube Amplifier Project page for more info.
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Audio-Innovations-700-Integrated-Tube-Amp.jpgAudio Innovations 700 Integrated Tube Amp3581 viewsAudio Innovations 700 Integrated amp. It is only 25W and really not impressive at all. Uses EL34 valves.
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