Photos of Commercial Hi-Fi Audio Gear, Components and Products.
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Capacitance-Multiplier-Power-Supply-Class-A-Amp.jpgCapacitance Multiplier Power Supply For Class-A Amp8099 viewsUsing Rod Elliot's Capacitance Multiplier Power Supply with Mark's DIY Class-A 2SK1058 MOSFET Amplifier.
This is a big improvement in heat dissipation, but I still may make more improvements to make it run cooler though.
Open-Baffle-Speaker-Fostex-FE206E-Eminence.jpgFostex FE206E / Eminence Open Baffle Speaker System7019 viewsThis open baffle speaker system is the latest creation from Keith's of Kickwood Audio. The drivers are the Fostex FE206E fullrange speaker and a 15" Eminence driver. Very nice looking and they sound as good as they look.
Push-Pull_6L6_Tube_Amplifier_Bottom.jpgUnderside - Push-Pull 6L6 Tube Amplifier1252 viewsUnderside view of my 6L6 tube amplifier. See the other photographs of my DIY 6L6 tube amplifier.
Panagiotis Gavriil (Greece)
See the DIY Audio Schematics page for more 6L6 amplifiers.
6EM7_Single_Ended_Triode_Amplifier.jpg“Paris” – 6EM7 Dual Mono Integrated Amplifier1259 viewsWhat started as a forum thread discussion (6EM7 power amp) ended in the construction of a 6EM7 (Sylvania tube) integrated triode amplifier. I used dual mono construction with two power transformers, two 5Y3 rectifier tubes and two separate power filter stages but with a shared single stage preamp. There is a single EMI/RFI power filter feeding both power supplies. Two chokes and two 15W Edcor audio output transformers are in the base of the enclosure. An Alps blue velvet pot after the preamp stage (4S Universal) controls volume to the power amp section. The colour is Sungold and the base Mirbue. The amp has a very detailed mid-range and produces about 2W.
Mark - retro-thermionic
6DJ8-6AS7-OTL-HP-Amp-Sanguine.jpgSanguine - 6AS7 OTL Headphone Amplifier80 viewsThe power supply and amp section are on two die-cast Al bases. A Sophia Mesh Plate Princess 274B rec. tube does the rectification. The PS has its own power filter to reduce EMI\RFI and the mains cable is choked. The power transformer is Hammond and the 20H choke is Hammond also and these are both isolated from the chassis by rubber grommets to control vibration. The 6AS7 power tube is NOS Winged "C" Svetlana and a NOS Tesla E88CC gold pin for the driver and is directly coupled. XLRs connect the HT and AC filament current to the amp section. A single 6.5mm input upfront with dual headphone output. Attenuation is provided by an Alps Blue Velvet pot. Both enclosures are dampened with bituminous Al foil and the paint is Epoxy Enamel. The attenuator knob is 4 ounces of solid brass.
The Sophia Mesh Plate 274B rec. tube and a 4uf PIO Russian filter cap start the filtering network with seven stages of filtering and storage in all. There is no PCBs or shielded wire used in this amp to dull the sound. Wiring is all point-2-point and component-2-componet. Fine silver plated wire warp wire carries all the audio. The only caps in the amp are the output caps. WBT silver solder is used throughout.Feb 10, 2014
6EM7-SE-Amp.jpgSE 6EM7 Power Amplifier294 viewsYet another 6EM7 power amplifier. This time some parts were down graded and a different internal layout technique was used. The power transformer and choke are isolated top and bottom by rubber grommets. This ensures no AC vibration reaches the tubes. The initial power supply filtering is preceded with a on-board power filter, a 20uF/450V electrolytic capacitor and a 20H/100mA Hammond choke. The HT is supplied by a Hammond power transformer and Sovtek 5Y3 rectifier tube. The second stage of filtering is 47uF and 100uF electrolytic with a large limiting resistor ensure the amp is totally free from of hum and noise. All power supply capacitors are snubbed.
This amp sounds better than the last and I think it may be the Sylvania NOS 6EM7 tubes. Sprague orange drops are used in the inter-stage coupling and once more large non-polarized capacitors for the bypass on the power tubes. For the first time I have used Chinese made H&K 15W audio output transformers, can't fault them. The look of the amp is almost under-stated "sexy" and the sound the same - sexy and natural.
Mark Houston – retro-thermionicNov 13, 2013
TDA7294-chipamp-6N3-tube-input.jpgTDA7294 Chip Amplifer with 6N3 Tube input347 viewsFrom a $48 printed circuit board and a bag of parts (eBay) I fashioned this very functional looking 80W amplifier. The parts include a 6N3 valve (preamp stage), two TDA7294 high performance power chips and all the parts required to populate the circuit board. You have to source the chassis, heatsinks and connectors yourself and that's where the expense starts.
The amplifier has been constructed in attractive charcoal black 2U 19" rack enclosure. Three sets of switchable RCAs on the back and 4 oz volume knob and Alps pot to control loudness. Speaker protection is included on the PCB and there is a delay (anti-thump) complete with flashing LED before the amp is ready for use. Very clean sound, holographic presentation.
For more details and impressions see the Chips and Tube - 6N3 and TDA7294 integrated amp thread.
Mark Houston – retro-thermionicOct 23, 2013
6EM7-Tube-Power-Amp-Arabella.jpgArabell - 6EM7 Tube Power Amp518 viewsInspired by a beautiful Acacia, heavy, chopping board I fashioned this excellent sounding single-ended 6EM7 tube power amp (Arabella). To hide wiring a shallow aluminum skirt is tucked up underneath. Smaller components also reside here. Larger power supply caps are housed in a “trunk” at the back where the RCAs and gold plated speaker binding posts are also located. Tubes are Dutch made AWA NOS and Sovtek 5Y3. A large Hammond power transformer (370EX) and Hammond 20H 100mA choke (193C) grace the gorgeous wooden top plate. Edcor GXSE (GXSE10-6-5K) audio output transformers stand proud and blue to give this build a striking look and super clean pure sound. I love the amp for its looks and sound, all 2.5W of it.