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| 569 files in 8 albums and 1 categories with 5 comments viewed 1,704,265 times |
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K-12M-Tube-Amp-Test-Listen.jpgK-12M Tube Amp - First Listen3450 viewsThis is my first listen with a K-12M Tube Amp Kit. The source is a NAD C542 cd player, with 3 way 12" 92dB efficient speakers and Transparent 200 interconnect cables. A cool way to get into valve amps. I lost 1000 hours here!
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Finish.JPGTandy Optimus 77 Upgrade9891 viewsThese Tandy Optimus 77, though many years old, had never been used. They were in as new condition but the woofer surround had rotted. I replaced the 5” woofer with an inexpensive 4” driver. I made clamps to hold it in place and heavy foam to ensure a good seal. The Xover 4.7uf cap was replaced with a quality cap and additional dampening added. They good but not stunning.
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12AU7-Tube-Cathode-Follower-Preamp.JPG12AU7 Cathode Follower Tube Preamplifier2305 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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KitAmpTopSmall.jpgKT88 SE UL Tube Power Amplifier1367 viewsI had put the partially finished amp in the gallery some weeks back. Now finished not a lot of difference on the outside except for the many silver colored screws on the top plate and some feet. See the other image for the underside shot. After a number of hours of careful listening and listening to it though others CD players, pre-amps and speakers I can say that most liked the sound. SE tube amps produce absolute and exquisite mid-range and silky highs and deep sound stage but this amp has a slightly narrow sound stage presentation. Bass improved and hum vanished with additional PS filter caps. With a brushed Al top plate and Mirabue timber thick timber base, Edcor XSE OPTs and component-2-component wiring on all circuit boards (including rectifier broard) this amp represents a clean and easy build with in-expensive parts. Though low powered (6W+) for a few hundred dollars you can experience the benefits of a tube SE UL design. So easy, so nice!
Here is a link to the KT88 Single-Ended (SE) Schematic I followed.
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Spin-Clean-Record-Washer-System-MKII.jpgSpin-Clean Record Washer System (Mk II) Kit Contents4 viewsHere are the contents of the new Spin-Clean Record Washer System (Mk II) which is available for $80US. We have completed a full review of the Spin-Clean LP Record cleaning system. The Spin-Clean record cleaner is fully manual and does a very thorough job of cleaning your records.
See the Spin-Clean Record Washer System (Mk II) review for more information about the Spin-Clean.
If you have any questions about the Spin-Clean, you can ask them in the Spin-Clean LP Record Cleaning System (Mk II) thread on the forum. May 15, 2012
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OddWatt-225-6SL7-KT77-PP-Tube-Amp.jpgOddWatt 225 (driver 6SL7, output KT77 push-pull)43 viewsThis is my version of the OddWatt 225 (push-pull) tube amplifier project that I built following the instruction on this website. The output power is 15W in pure class-A operation. The amplifier can be used with KT77 and 6L6GC output tubes.
I'm using the push-pull KT77 tube amplifier with my DIY Turntable (record player) which is a featured project on the website.
Nandor Szabo (Hungary)May 07, 2012
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Scott-299-Amplifier.jpgScott 299 Amplifier Rebuild38 viewsThis is a picture of my 299 Scott Amplifier. I made the whole enclosure case using 1/2" (13 mm) aluminum. The knobs are made of one and 1-3/8" roll aluminum. The face plate is made from a piece of stainless steel with silk screened lettering. The Scott 299 amplifier was completely re- built from the ground up and it sounds great.
Thank you,
Ken Valeo (USA)May 06, 2012
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DIY-Dynaco-ST70-Tube-Amp.jpgDIY Dynaco ST-70 Tube Amp Rebuild52 viewsThis ain't your father's Dynaco ST-70 amplifier. Mahogany case with toroidal power tranny.OPTs are original Dynaco 470s purchased via auction. Trannies "capped" with same wood. Features the tubes4hifi 12AU7 version of their driver board (and I woud never go back to the 12AT7 version now).
Re-issue GoldLion KT88s, Mullard 12AU7s. Fused with an IEC and on-off switch up front. Bias adjusting performed via Red Test Jacks perpendicular to holes cut for trimmers Ground/Common is Black test jack behind center driver tube. Tubes colored with LEDs.
Charlie Mooradian
USAMay 05, 2012
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