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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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EL84-Single-Ended-Tube-Amp.jpgTesting a DIY SE EL84 Tube Amp4984 viewsHere I am testing the Single Ended EL84 Stereo Amplifier. The whole AMP fits on a 100 by 160 mm DIY PCB. A double triode ECC88 / 6DJ8 or ECC82 tube is used to amplify the input signal. See other photo for the finished amplifier and more details.
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DIY-KT88-Single-Ended-Tube-Amp~2.jpgDIY KT88 Single Ended Tube Amplifier3876 viewsSingle Ended Tube Amplifier after Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier Schematic.
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0006sa0w.jpegOTL 6082 amplifier3955 viewsThis is my latest (work in progress) amplifier. It is a transformerless design using 6082's in the output stage. 6082's are 26.5 volt 6AS7GA's which were originally designed for series pass regulator service. More information can be found at the bottom this webpage.
http://userpages.bright.net/~geary/misc/radiohandbook.html

Steve Geary (z-strat)
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KT88-Push-Pull-Tube-Amplifier.jpgMonoblock KT88 Push-Pull Tube Amplifier2970 viewsPhoto of a KT88 Odd Block without the protective cage. This tube amp design will work with a number of octal tubes (KT77, 6CA7, EL34, 6L6GC, KT88, KT90 and 6550). SRPP driver stage using a 12SL7 tube. Output stage is a Class A Ultra-Linear SIPP with Gold Lion KT88 vacuum tubes. LM317 Regulators are used to provide the cathode CCS.

For more information, see the 12SL7 SRPP / KT88 Push-Pull DIY Tube Amp project page.
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KT88-Push-Pull-Tube-Amplifier-Cover.jpgKT88 Push-Pull Tube Amplifier (monoblock)2808 viewsThe third of the "OddWatt" tube amp projects. This one is the Odd Blocks which will work with a number of octal tubes (KT77, 6CA7, EL34, 6L6GC, KT88, KT90, 6550). The driver stage is an SRPP using a 12SL7 tube. For the amp shown above, the output stage is a Class A UL SIPP using Gold Lion KT88 vacuum tubes. LM317 Regulators are used to provide the cathode CCS.

For more information, see the 12SL7 SRPP / KT88 Push-Pull DIY Tube Amp project page.
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little-amp.jpg50L6GT Tube Amplifier3635 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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Simple-SE-6L6GC-Tube-Amp.jpgSimple SE 6L6GC Tube Amp Kit3430 viewsFront view of the Simple SE Tube Amplifier using a PCB from tubelab.com. Rectifier tube is 5AR4/GZ34, input tube is 12AT7/ECC81 and power/output tubes are 6L6GC. The audio output transformers are from Edcor.
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Simple-SE-6L6GC-Tube-Amplifier-Kit.jpgSimple SE 6L6GC Tube Amplifier Kit3090 viewsTop view of the Simple SE Tube Amplifier using a PCB from tubelab.com. 6L6GC tubes and Edcor output transformers.
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TubeLab-Simple-SE-6L6GC-Tube-Amp.jpgTubeLab Simple SE 6L6GC Tube Amp3500 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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OTL-Tube-Headphone-Amplifier.jpgOTL Tube Headphone Amplifier4153 viewsThis is a picture of a tube headphone amp that I was building but gave up as I could not get it to work properly.
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IMG_2675.JPG50EH5 / 25EH5 Tube Amplifier Internals3095 viewsFinally, the internals of the 50EH5 tube amp. I think I went a bit extreme on the fancy parts as I used 100uF Black Gate's and 62 ohm Riken's on the cathode bias of the tubes. As for the preamp I used more Riken's and a couple of 0.1 Mundorf plate caps. I also used a 12AT7 rather than the 12AX7, although they are interchangeable to what ever you decide. I then re-used a 500K pot as the volume control instead of the 100K (because that is what I had) and added a switch between preamp and line in.
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IMG_2678.JPG50EH5 / 25EH5 Tube Ampr with 12AU7 Mini Tube Preamp2677 viewsYet another picture of the 50EH5 Tube amp in action along side with the Mini 12AU7 tube preamp.
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IMG_2685.JPGDIY 50EH5 / 25EH5 TUbe Amplifier in the dark2274 viewsHere we have a picture of my 50EH5 / 25EH5 amp in the dark, along side with my Mini 12AU7 preamp.
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00005.jpg25EH5 / 50EH5 Tube Amplifier2739 viewsAnother view of the amplifier from the top. As you can see, I was using headphones as I took the effort of adding a jack with impedance matching resistors so I could listen to my music in peace. The funny thing is that I can apply just about any load to the amplifier without any audible change other than volume.
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IMG_2554.JPG50EH5/25EH5 Filament Reg. Power Supply2622 viewsThis is the inside of the regulated power supply for the 50EH5 / 25EH5 tube filaments. It uses an LM317 voltage regulator and an old VCR power transformer that had just the right voltage and current ratings for the filaments of the 50EH5 / 25EH5 tubes. The output from the regulator is set for 20 some volts for the 25EH5's, and the unregulated DC is about 45V for the 50EH5's.
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IMG_2142.JPGGlowing 12X4 Tube2433 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.
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IMG_1960.JPGMini 12AU7 Tube Preamp2830 viewsAnother picture of the 12AU7 tube preamp close up showing the input/output plugs on the side. The preamp got its name from being nearly impossible to wire the internal parts because of the small case.
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DIY-12AU7-Tube-Preamplifier.jpgMini 12AU7 Vacuum Tube Preamplifer2577 viewsThis is a simple 12AU7 tube preamp built using a couple of Hammond cases and a few reused parts.
By: Alan M.
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DIY-50EH5-25EH5-Tube-Amp.jpgDIY 50EH5 / 25EH5 Tube Amplifier2973 viewsThis tube amplifier project uses the parts from a junked Fleetwood console stereo. It uses a 6AX4 full wave bridge rectifier two 5A 400V fast recovery diodes. The preamp tube is a 12AX7 and the power tubes are 50EH5. I followed the basic ideas from Gio's DIY 50EH5 Tube Amplifier Project. This is my super sized version of the amp with all DC regulated filament supplies and even does a lower frequency response than usual because of larger output transformers (underneath the chassis).
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top1.jpgPush-Pull 6T9 Stereo Tube Amplifier4324 viewsThis is a project I started some time ago which was inspired by the Spare Time Gizmo's 6T9 Tube Amplifier Kit. I decided to make it push-pull using circuit ideas from my Eico HF-81 and my RCA Receiving tube manual. The combination wood and brass chassis came about when I found a small sheet of brass shoved under a cabinet and long forgotten about at work. It took a bit of work to clean it up and polish it to that shine! The wood is poplar purchased at Lowes, stained with Minwax Red Mahogany stain and finished with Amber Shellac.

Additional information: 6T9 Push-Pull Tube Amplifier
234 files on 12 page(s) 9


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