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.

DIY Audio Projects Photo Gallery


[ Gallery Home | Upload Photo | Recent Uploads | Most Viewed | Search ]

Most viewed
DSCN0290_Small.jpg
DSCN0290_Small.jpgAnother version PP UL Oddblock 6P3S & ECC83 Tungsram2552 viewsAnother version PP UL Oddblock. This one uses 6P3S & ECC83 Tungsram tubes.

See the OddWatt KT88 tube amplifier project page for information about the circuit.
JJ-Tesla-Blue-Glass-KT88-Vacuum-Tubes.jpg
JJ-Tesla-Blue-Glass-KT88-Vacuum-Tubes.jpgJJ / Tesla Blue Glass KT88 Tubes2549 viewsA set of Blue glass envelope JJ / Tesla KT88 vacuum tubes used in the Odd Blocks - KT88 Push-Pull Class A DIY Tube Amplifier
Push-Pull_6L6_Tube_Amplifier.jpg
Push-Pull_6L6_Tube_Amplifier.jpgPush-Pull 6L6 Tube Amplifier2544 viewsMy DIY 6L6 tube amplifier. The output tubes are 6L6 which are driven by a pair or 12AX7. The indicator tube is an EM80. See the other photos.

Panagiotis Gavriil (Greece)

See the DIY Audio Schematics page for more 6L6 circuits.
KT120_IIs.jpg
KT120_IIs.jpgBe Bamp with KT120 Tung-Sol tubes2543 viewsA fellow builder had bought a pair of these tubes and claimed they were an improvement over KT88s and others. I had to try for myself. Just dropping in the tubes in where the JJ Blues Glass KT88s once were gave me a 2W improvement in my SE UL bread board amp raising the power to 9.7W. Bass is far more controlled and mid-range crisper and clearer. Idle current is 112mA up from 93mA and HT+ is 400V with bias at 34V. Operation is class A. These tubes are not only impressive looking but have improved the performance of the amp. +/- 3db points are 26hz to 36khz.
Genalex-Gold-Lion-KT88-Vacuum-Tubes.jpg
Genalex-Gold-Lion-KT88-Vacuum-Tubes.jpgGenalex Gold Lion KT88 Vacuum Tubes2542 viewsClose up view of the Genalex Gold Lion KT88 Vacuum Tubes. The amplifier topology is Push-Pull and built following Bruce's KT88 Push-Pull Class A DIY Tube Amp with 12SL7 Driver build. The extra tube is a 6NO30 which delays the B+ so the tubes have time to warm up.
Digital_Pictures_1_033.jpg
Digital_Pictures_1_033.jpgKT77 OddBlock close-up2540 viewsOddblock KT77 close-up view. Instructions for this tube amp project can be found on Bruce's KT77 Push-Pull Tube Amp page.
BoydOutSideSmall.jpg
BoydOutSideSmall.jpgJAN6418 sub-mini tube preamp kit MKII2539 viewsThe MKII finished Oatley kit complete with 4oz brass knob. See other image for an internal photograph. The preamp has an excellent sound with good bass extension. This build was requested by an Australian women who saw the preamp article on the diyAudioProjects.com site. For more information about these little battery powered tube amplifier kits, see the JAN6418 tube preamp / headphone amp kit.
IMG_2142.JPG
IMG_2142.JPGGlowing 12X4 Tube2537 viewsThis is a glowing 12X4 / 6X4 tube in a full wave bridge rectifier power supply. I've only seen a couple of people use a diode and tube type bridge rectifier, but I personally like this setup. This type of bridge rectifier is used in my 50EH5 amp but using a 6AX5. This is a project I have not finished yet.
5751-SRPP-Push-Pull-EL84-Tube-Amp.jpg
5751-SRPP-Push-Pull-EL84-Tube-Amp.jpg5751 SRPP / Push-Pull EL84 Tube Amplifier2536 viewsThree months ago, I finished the PoddWatt 5751 SRPP / Push-Pull EL84 tube amp. This is a great amplifier with great sound. Now it is connected in UL mode without any NFB. I would like to try the amp in a Triode connection mode, but I do, there is too much power loss so I am investigating a the possibility of a parallel push-pull output stage.

This enclosure is made using the material Corian which is a product by DuPont often used for counter-tops.

Dean

For full details of this tube amplifier circuit, see the PoddWatt 5751 SRPP / EL84 (6BQ5) Push-Pull Tube Amp Project page.
Audio-Note-Jinro-Integrated-211-Tube-Amplifier.jpg
Audio-Note-Jinro-Integrated-211-Tube-Amplifier.jpgAudio Note Jinro Integrated Tube Amp (SE 211)2515 viewsAudio Note Jinro Integrated Tube Amplifier on display at the 2011 Salon Son & Image show in Montreal.

Tubes: 2 x 5R4WGB, 2 x 211, 1 x ECC82 (or 5814a), 1 x 7044 (or 5687).

Power: 18Wpc into 8ohm @ 5% THD.
Weight: 85lbs
Cost: $26,500
DSCN0084s.jpg
DSCN0084s.jpgSE RCA 2A3 Triode Tube Amp2514 viewsMy favorite class-A single-ended (SE) tube amplifier an RCA 2A3 triode driven by a Phillips E180F pentode. The audio output transformers are Hammond 125 FSE.

The power is external in the black box on the right side. 2x4 w and consists of Black Gate and Rubycon capacitors. Resistors carbon
film and Mills. Autobias. Interstage transformers
Club191207.jpg
Club191207.jpgLast Audio Club Meet for 2007 - Melbourne, Australia2507 viewsTaken with a camera phone the Melbourne Audio Club last meet of the 2007 year is DIY night. You can tell by the array of equipment there was plenty of participants. A Great night.
TeaBoxInsideSmall.jpg
TeaBoxInsideSmall.jpgTwinings Tea Box 12AX7 Tube Preamp with External 5Y3 Power Supply2500 viewsIn this build I used the Jensen copper, paper and oil caps for the input, output and inter-stage coupling and Solen Teflon for the feedback capacitor. The preamp is a two stage triode (12AX7s AWA-Australian) with global feedback and is the original Silicon Chip design with some modifications. They are bigger caps all round and no printed cct. brd. Construction of brds. was component-2-component wiring which means there is NO additional wire used on the brd. construction. At the brd. level this is better than point-2-point wiring. This cuts down on soldered connections/junctions and cct. length. All 99.999% pure silver wire with heat shrink insulation is used in the signal path to connect brds. to RCAs and Alps blue velvet pot etc. Medium gauge OFC hook-up wire brings power to the brds. Heavy bituminised Al foil lines the light timber case to provide a ground plain and RFI/EMI shielding. The remote PS employs a 5Y3 rec. tube (Australian made in this case) Hammond 370X power tranni 193B 12H choke.
DSCN0450S.jpg
DSCN0450S.jpg6S4S & 6J9P SE tube amplifier project2494 viewsMy new single-ended class-A amplifier using 6S4S and 6J9P tubes.
SE-807-Tube-Amp.jpg
SE-807-Tube-Amp.jpgSingle-Ended (SE) 807 Tube Amplifier2488 viewsAfter picking up a couple of cheap ($7) ATS25/807 tubes a volunteer from the forum, Matt, designed me an amp to go with them. This project stagnated for over a year and a half and now is finally finished. The colours are strong between the Edcor 25W OPTs and power tranni and the “Red Delicious” top plates. The bases are Australian Spotted Gum. Remote PS carries a 5H 300mA Hammond choke and 5Y3 power tube (upgraded to Golden Dragon 5U4). The amp section has all ceramic sockets and plate cap, the driver tube a Sovtek 6SN7 (has been upgraded to Shuguang 50 Year Treasure). Bipolar bypass caps are used on the 6SN7 and low ESR caps on the 807s. The amp looks smart and sounds excellent. It plays loud for its 2.7 measured Watts and has huge dynamic head room.

Mark - retro-thermionic
KT88-Push-Pull-Vacuum-Tube-Hi-Fi-Amp.jpg
KT88-Push-Pull-Vacuum-Tube-Hi-Fi-Amp.jpgKT88 Push-Pull Tube Amplifier with 12SL7 Driver2487 viewsKT88 Push-Pull Tube Amplifier with a 12SL7 Driver stage and a 6NO30 thermal delay relay tube. The amplifier is build following Bruce's 12SL7 SRPP / KT88 Push-Pull DIY Tube Amp build. The power tubes are new production KT88 Gold Lions made by Genalex.
Oatley-Electronics-K272B-prototype.jpg
Oatley-Electronics-K272B-prototype.jpgOatley Electronics K272B prototype2487 viewsSoon to be released Oatley Electronics K272B prototype. I recently made two CMoy style, OPA2134 based, HP amps but now prefer the better sounding, harmonically rich, K272B build. Two 9V batteries are used in parallel to prolong battery life and switching phone jacks, power switch and “on” LED ensures it is difficult to accidentally leave the amp on. The enclosure is impact resistant ABS which is heavy Al foil lined. Volume control is via your player and the “6418-B” will drive low impedance phones. Where the CMoy style, chip based, HP amps are clean, clear, bright and clinical, the “6418-B” has a much richer, more harmonically complex sound and a smoother all over delivery. Really it all gets down to taste. I would recommend building the K272B when released around early February 2013. I suggest you upgrade the Oatley passive parts and chip socket to better quality parts.

For more info, see the
Oatley K272B JAN6418 headphone amp and preamp thread in the forum.

Mark Houston – retro-thermionic

SAR-Labs-STA80-KT88-PP-Tube-Amp.jpg
SAR-Labs-STA80-KT88-PP-Tube-Amp.jpgSAR Labs STA80 KT88 Tube Amp2485 viewsShot of a Scientific Audio Research Labs (SAR Labs) STA80 tube amplifier over at Fred's place (April 2010). The tube compliment was 12AT7, 12BH7 (I think) and JJ KT88 Blue Glass tubes. About 55-65W and very nice sound.
Don_SE_300B_Tube_Amp.jpg
Don_SE_300B_Tube_Amp.jpgDon's single-ended 300B amplifier2483 viewsThis is Don’s (a friend) 300B. It uses EH 300Bs plus a dual driver stage 6SN7. The top plate is 4mm ABS plastic. The timber base Don makes himself and are extremely elegant. Absolute first class craftsmanship. The transformers are wound locally by Dyne. Don has no formal training in electronics and doesn’t understand how the circuits work but he has no problems following a schematic. Don has also built a 6C33C SE and EL34 SE and a few others. This 300B has a big solid sound.

Mark - retro-thermionic
71-A-Tube-Amplifier-SE.jpg
71-A-Tube-Amplifier-SE.jpgUX-171A Tube Amplifier2483 viewsThis amplifier uses the UX-171-A tube (matched pairs) which are rare and produce only 1/2 W of output power. There are no resistors or capacitors in the audio circuit. A Hammond 124B nickel core inter-stage transformer couples to the power tube. Edcor 10W OPTs in the metal case. Bias is provided by 3 x 9V batteries and 230V by two step-down transformers wired in reverse. The rectifier tube is a very old "80". Power supply filtering is under the top plate (ply timber). The base houses the power transformers and is a 1940s wooden pot stand. The tube amplifier sounds excellent.

For more info, see the 171-A single-ended amplifier thread in the forum.

Mark Houston – retro-thermionic
614 files on 31 page(s) 27


DIY Tube Projects :: DIY Tube Amp Kits :: DIY Speaker Projects :: DIY Solid State Projects :: DIY IC / Opamp Projects :: DIY Phono Projects :: DIY Cable Projects :: HI-Fi Audio Schematics
© diyAudioProjects.com - Terms of Service - Privacy Policy