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

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Scanspeak-8531-D3004-6600-00-T-Line-1.jpg
Scanspeak-8531-D3004-6600-00-T-Line-1.jpgScanSpeak Revelator 8531 MidBass and D3004-6600-00 Tweeter in Transmission Line Enclosure7644 viewsScanSpeak 8531 mid-bass and Scanspeak Revelator D3004-6600-00 Aircirc tweeters. The midbass is in a transmission line housing, and the tweeter in a separate decoupled enclosure. Close up view.Sep 30, 2008
Scanspeak-8531-D3004-6600-00-T-Line-2.jpg
Scanspeak-8531-D3004-6600-00-T-Line-2.jpgScanSpeak Revelator 8531 MidBass and D3004-6600-00 Tweeter in Transmission Line Enclosure7346 viewsThese loudspeakers were designed around the ScanSpeak 8531 carbon paper mid-bass and Scanspeak RevelatorD3004-6600-00 Aircirc tweeters. The midbass is in a transmission line housing, and the tweeter in a separate decoupled enclosure.Sep 30, 2008
EL34-Push-Pull-Tube-Amp-Kit.jpg
EL34-Push-Pull-Tube-Amp-Kit.jpgMars EL34 Push-Pull Tube Amplifier Kit3622 viewsA tube kit amp available in South Africa. For more information see the EL34 Tube Amplifier Kit thread on the forum. Sep 29, 2008
DIY-KT88-Single-Ended-Tube-Amp~1.jpg
DIY-KT88-Single-Ended-Tube-Amp~1.jpgDIY KT88 Single Ended Tube Amp4012 viewsFront view of my KT88 Single Ended Tube Amplifier. The circuit follows Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier Schematic.

Additional information and pictures for this project are available on my build log: SE KT88 Tube Amp.
Sep 26, 2008
KT88-Single-Ended-Tube-Amp.jpg
KT88-Single-Ended-Tube-Amp.jpgKT88 Single Ended Tube Amp - Inside View4220 viewsInside view of my KT88 Single Ended Tube Amplifier projct. The circuit is just like Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier.

For the power supply I used some UF5408 diodes for the B+ and 6A10 for the heaters (they are on a heat sink as they dissipate a lot of power). Bypass capacitors for the driver stage are Rubycon ZL and for the power stage Nichicon. The B+ is lower to improve tube life.

More information and pictures are available on my build log: SE KT88 Tube Amp.
Sep 26, 2008
DIY-KT88-SE-Tube-Amplifier.jpg
DIY-KT88-SE-Tube-Amplifier.jpgKT88 Single Ended Tube Amp Build4117 viewsRear view of the KT88 Single Ended Tube Amplifier. The circuit is just like Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier Schematic.

Additional information and pictures are available on my build log for this project: SE KT88 Tube Amp.
Sep 26, 2008
PDC400s.JPG
PDC400s.JPG$50 Teac PDC400, as good as a $700 NAD C5422742 viewsOf course in its day this five CD player with four times oversampling and dual DACs would have cost a lot more than $50. But from a secondhand store, in a sleepy fishing village in southern Australia, this was a real steal! It has removable cover and hinges. No remote. And it works 100% flawlessly and is in excellent condition. Seen here with my headphone driver and ATH-AD700 headphones. I obtained two identical CDs and identical cables and put both the NAD and Teac through an A/B switch.Queued both CDs perfectly and switched from NAD to Teac repeatedly to try to resolve which played better. There was absolutely nothing between the two. The Teac performed as well as the NAD in every area. I have been told that if Teac went to the trouble of installing dual DACs it would definitely be a good player. I have about thirty hours of play on it in a very short time and it delivers clear and detailed music and works very well with my 2N3055 based headphone driver. Yes, a real steal!Sep 26, 2008
Swans-Tempus-HiVi-3-Way-Tower-Speakers.jpg
Swans-Tempus-HiVi-3-Way-Tower-Speakers.jpgSwans Tempus and HiVi 3-Way Tower Speakers5955 viewsDIY Hi-Vi Research Swans Tempus Bookshelf Speakers sitting on Hi-Vi 3-Way Tower Loudspeakers that I built a few months back.

See Hi-Vi Research F6 / TN28 Swans Tempus Bookshelf Speakers for an overview and the speaker box plans. Also my build log has more photos and construction notes.
Sep 24, 2008
Hi-Vi-Research-Swans-Tempus-Bookshelf-Speakers.JPG
Hi-Vi-Research-Swans-Tempus-Bookshelf-Speakers.JPGHi-Vi Research Swans Tempus Bookshelf Speakers5922 viewsRear view of the Hi-Vi Research Swans Tempus Bookshelf Speakers. I built two pairs of the Tempus and the cost was about $725/pair. I think that is a very fair price for speakers of that quality.

See Hi-Vi Research F6 / TN28 Swans Tempus Bookshelf Speakers for the speaker box enclosure plan. Also my build log has more information.
Sep 24, 2008
Hi-Vi-Research-Swans-Tempus-Speakers.JPG
Hi-Vi-Research-Swans-Tempus-Speakers.JPGHi-Vi Research Swans Tempus Speakers6015 viewsHi-Vi Research Swans Tempus Bookshelf Speakers built by Daniel Bolduc. Bass frequencies are deep and clean while the highs are well balanced. But, due to either the limitation of the TN28 to 20 kHz or the crossover network, high frequencies are not as well defined and crisp as on the Hi-Vi 3-Way Tower Loudspeakers I built few months ago.

Here is an overview of Hi-Vi Research F6 / TN28 Swans Tempus Bookshelf Speakers with the enclosure plan. Also see my build log for more photos and construction details.
Sep 24, 2008
DIY-Zigmahornet-Loudspeakers-Merrill-4_4-drivers.JPG
DIY-Zigmahornet-Loudspeakers-Merrill-4_4-drivers.JPGZigmahornet Loudspeakers with Merrill 4.4 Fullrange Drivers5263 viewsThis was my first attempt at speaker building. They are Zigmahornet Speakers with Merrill 4.4 fullrange speakers instead of the Fostex FE103E. I chose black paint because it fit with the TV and TV stand/stereo cabinet that I have plus it hides my questionable workmanship. All in all, I really enjoyed making them and with the Merrill drivers they sound great with a surprising amount of bass from such a small driver.Sep 22, 2008
Electros.jpg
Electros.jpgElectrostatic Speakers3023 viewsThese Electrostatic speakers are made by a company which does not make speakers but develops new technologies in electrostatics. The best way to demonstrate these technologies is to build speakers to showcase them. They also have developed acoustic filtering which is applied to their sub-woofers which are based around two 5" drivers firing on opposite directions.

The tall black panels have two 100W amps built in the base made from discrete components, one for the panel array and the other to drive the sub-woofer in the base. The black speakers have a RRP of $AU12,000. Small black panels on the table are $AU1000 a pair. The tall silver panels produced clear live sounding mids and highs but seriously lacked base. These were demonstrated at a GM of The Melbourne Audio Club, Victoria Australia.
Sep 20, 2008
6T9-Vacuum-Tube-Amplifier-Kit.jpg
6T9-Vacuum-Tube-Amplifier-Kit.jpg6T9 Tube Amplifier in Ultra Linear Mode3060 viewsMy second 6T9 vacuum tube amp with Edcor transformers. This time the screen grid resistor was cut away and the UL tap was used. I believe it sounds better using the UL tap. Detail in voice appears to be much richer and the sound stage more detailed than with the previous amp. The tubes once more are NOS GE and are the taller variety. For full details, see the Ultra-Linear 6T9 DIY Tube Amplifier page. Also, here is my first DIY 6T9 Vacuum Tube Amplifier Project.Sep 04, 2008
6E5P_SE_6n1p_driver-_maze_OPTS.jpg
6E5P_SE_6n1p_driver-_maze_OPTS.jpg6E5P SE, 6n1p driver, MAZE OPT's in a scrappy chassis for testings3122 viewsThis is one of my latest audio tube DIY projects made in a scrappy chassis for breadboard use and measurements. I 'll transfer it to a nice wooden chassis now for sure.
The tube in output is the russian HF tetrode 6E5P, with max anode dissipation 8.5 Watts. It's a hell of a driver together with a CCS or Choke loaded solution. The driver is a classic ground cathode with the 6n1p for both channels. The 6n1p cathodes are not cap bypassed so the gain in this operating point is ~ 8. This is what exactly needed to drive the 6E5P in full output without the use of a preamp. The PSU is a tube type one using the Sovtek 5AR4. All the PSU caps are MKP (Mcap by Mundorf 100μF/400v.
By the way there is no Electrolytic cap in this Frankie amp. The cathode bypass cap on the 6E5P stage (output) is also MKP by Solen 82μF/250V. The coupling cap from driver to 6E5P grids is RC type using the marvelous 0.22/1000V PIO K40Y Russian caps. The OPTS are a bit over sized with 5K primary impedance made by mazeboutique.com.
Sep 01, 2008
PP_EL84_driver_EL84.jpg
PP_EL84_driver_EL84.jpgSimple EL84 PP, my first tube audio DIY project3281 viewsThe well known simple EL84 PP schematic as my first attempt at Tube Audio projects.
Here in the first version I also used the EL84 triode strapped as a driver. For me It was like hearing music from heaven.
That wooden case is from a liquor store having which contained Vodka and Brandy inside.
Sep 01, 2008
EL84_PP_6E6P_driver_1.jpg
EL84_PP_6E6P_driver_1.jpgThe Simple EL84 PP version 2 (on steroids) 3361 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.
Sep 01, 2008
Blue_Velvet_Pre_Amp.jpg
Blue_Velvet_Pre_Amp.jpgThe Blue Velvet Tube Pre-Amplifier3636 viewsMy second tube audio DIY project, The Blue Velvet tube Preamp by Dick Olsher.
The only changes from the original schematic is the use of a 6X5GT tube rectifier. This is an excellent preamp. The 6SN7 tubes by KENRAD gives deep lows and velvet mids - highs. Coupling caps are Mundorf Silver Oil 0.68μF.
Sep 01, 2008
Blue_Velvet_Pre_Night_shot.jpg
Blue_Velvet_Pre_Night_shot.jpgBlue Velvet Tube Preamp - Night Shot2790 viewsThis is my second audio DIY project. A Blue Velvet Preamplifier. Picture taken in the dark.Sep 01, 2008
6V6_PP_1_S.jpg
6V6_PP_1_S.jpg6V6 PP, 6SL7 LTP Driver - Phase Splitter3209 viewsAnother try to small power PP AMPS. 6SL7 in frint in LTP configuration, using IXYS 10M45s as current sink at 1.2mA.
Output tubes are set with a fixed bias, using a separate and negative voltage power supply.
A nice sounding amplifier which provides about 10.5 Watts at 1.5 % THD. This amp uses Hammond OPT's and a PSU choke.
Sep 01, 2008
SV101780.JPG
SV101780.JPGOpen Baffle Speakers - Rear6413 viewsThis shot shows the OBs before two layers of darcon were stapled to the rear leaving only the woofer rears exposed. The particle board is 18mm the woofers 10", mids 2" domes and titanium tweeters. The Xover is a 2nd order. I replaced the HF caps with metal film polypropylene varieties from electrolytics. Heavy metal brackets join the base board and baffle broad. The boxes recline slightly so the speakers will stand up without other assistance.

Listing is pleasant with voice bright and bass OK but not deep. The woofers are new and very stiff so bass response may follow many hours of playing. See other image.
Aug 31, 2008
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