Photos of Commercial Hi-Fi Audio Gear, Components and Products.
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DIY-Silver-Wire-RCA-Interconnect-Cables.JPGDIY Interconnect Cables with Silver Wire4950 viewsSimple DIY RCA interconnect cable project made using pure silver wire.
Related: DIY Silver RCA Interconnect Cables
K-12-Tube-Amp-Kit-with-Enclosure.jpgK-12G Tube Amplifier Kit with "G" Series Case3557 viewsFinished build of a S5 Electronics K-12G Tube Amplifier kit by Rudi Slejkovec in Slovenia. The enclosure is a "G" series case which is also available from the manufacturer.
rectifier_tube_150_amp_6_phase.jpgMassive Rectifier Vacuum Tube (Valve)1804 viewsWhat a tube! This is a vacuum tube rectifier. 150 Amps with 6 channels.
12au7_4S_preamp.jpg12au7 preamp942 viewsIn this build I employed a single stage tube preamp to provide gain and volume control to my 3W 6AS7 SET amp. This preamp uses a 24VAC wall wart and by configuring a 24/240V step down tranni to work backwards I can gain 280VDC across the 12AU7. No hook-up wire is used in the amp cct. only component-2-component wiring. The preamp produces no hum or buzz. It extends to a deep rich bass and very natural mids and highs. The frequency response is flat from 10hz to 130KHz and square way performance is exceptional. There is more information in the Super simple single stage tube preamp thread on the forum.
6EM7-SE-Amp.jpgSE 6EM7 Power Amplifier52 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 input104 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 Amp261 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.
Mark Houston – retro-thermionicSep 03, 2013
S-5-Electronics-K-16LS-kit-enclosure.jpg221 viewsI'm running this stock apart from the Alps Blue volume pot which I upgraded after the original sprang a leak. I'm using quite a few components bought from: http://www.mafaudio.com/pro/propage.aspx.
There are seven LED's that light up the feet and fronts of the brushed aluminum transformer cases. The LED's are powered from a 12v mains transformer bought from Maplin in the UK. The VU meters also run from the extra transformer. The chassis is made from wood bought from the local yard. To cut the VU meter holes I used a 32mm Spade bit then used a file to open the hole up to just under 34mm. The main volume control area was drilled using a 50mm Forstner bit and the tone controls a 30mm Forstner bit. It's coated in about 5-6 coats of clear varnish and involved an awful amount of sanding.
There are more photos available in my photo library.