Vacuum Tube (Valve) Audio Projects
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Wooden-5687-Valve-Preamplifier.jpg5687 Valve Line Preamplifier4969 viewsThis is the second DIY 5687 Valve Preamplifier that I built. The enclosure is a DIY wooden box and painted black.
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Wooden-5687-Valve-Preamp-Rear.jpg5687 Valve Preamp - Rear View5265 viewsMy second DIY 5687 Valve Preamp project. This one is housed in a wooden box.
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6SN7-6L6-Tube-Amp-1.jpg6SN7 / 6L6 DIY Tube Amp6950 viewsThe valve lineup for each channel is a 6SN7 as first amplifier and phase splitter, followed by another 6SN7 driving a pair of 6L6s. Bias is set by active semiconductor current sinks. The 400V HT is generated by a double anode diode (5R4) driving a choke input filter. The audio output transformers are Hammond Manufacturing 1620s. With a conservative rating of 20W per channel, measured frequency response is 10Hz to 40KHz with minimal square wave overshoot. I'm very pleased with how this unit sounds and looks.
Schematic Drawing: Williamson 6SN7 - 6L6 (KT66) Tube Amplifier
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6SN7-6L6-Tube-Amp-2.jpg6SN7-6L6 DIY Tube Amplifier6571 viewsThis amplifier uses a Williamson front end and phase splitter, with an ultralinear output stage. The valve lineup for each channel is a 6SN7 as first amplifier and phase splitter, followed by another 6SN7 driving a pair of 6L6s. Bias is set by active semiconductor current sinks. The 400V HT is generated by a double anode diode (5R4) driving a choke input filter. The audio output transformers are Hammond Manufacturing 1620s. Conservative rating of 20W per channel.
Schematic: Williamson 6SN7 - 6L6 (KT66) Tube Amplifier
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6SN7-6L6-Tube-Amp-3.jpg6SN7 / 6L6 Tube Amp7450 viewsWilliamson front end and phase splitter, with ultralinear output stage. 6SN7, followed by another 6SN7 driving a pair of 6L6.
Tube Amp Schematics: Williamson 6SN7 - 6L6 (KT66) Tube Amplifier
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6SN7-6L6-Tube-Amp-4.jpg6SN7-6L6 Tube Amp Top View5934 viewsTop view 6SN7, 6L6 Tube Amp.
Link to the schematics for this tube amp: Williamson 6SN7 - 6L6 (KT66) Tube Amplifier
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9pin-to-octal-adapter.jpg9 pin to octal tube adapter5111 viewsI wanted to verify that a 12AT7 was equal to a 6SL7 in the OD2.5. So this is an adapter made from an old octal tube base and a 9 pin socket. It worked and yes the tubes are interchangeable. I will check the frequency response and distortion and see if there is any difference, but sound wise they seem the same.
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Underside.JPGPartial Wiring Close up6002 viewsPoint to point wiring is a must in my opinion to achieve what you owe yourself , when it comes to turning the piece of art on . I just wish I could of shown my grandfathers what I have built. This shot shows some of the input stage power supply , Hexfreds , Precision resistors from PRP , and a snippet of the output power supply cap banks for the + / - DC rails that make up the 140 VDC supply.
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2nd_monoblock.JPGUnderbelly shot of the DIY OTL Tube monoblock5630 viewsStrangely enough , the second was made intentionally Mirror Image , but I had neglected the fact that the Toroids had the same winding tail positions , so the build wasn't perfectly mirror image after all . This actually was a bit of a headache , since the first was more ideally layed out in electrical design & visual eye candy
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Mill_1.JPGFront View of the DIY OTL Tube monoblocks7138 viewsWeighing in at 18.5kg's each , these chassis are milled out of Aluminum plate and form part of the main heat sink for the tube sockets that are a precision fit . 6mm thick plate was used through out . The feet are solid with machined slots using cap screws to capture from the inside ( so no holes can be seen )
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Mill_2.JPGRear View of the DIY OTL Tube Amps 5845 viewsThe chassis of my amps were machined in this German Milling machine - a real beast . It had to be repaired at a few stages just to complete the build. You can see the torodials that are used for the Driver stage ( smallest ) ..The Heaters ( next largest 6.3vac @ 32A ) and the Output Power supply ( the largest toroid - 1KVA @ 100 VAC )
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Workshop_Heater.JPG2nd DIY OTL monoblock being built7704 viewsFreezing cold in the workshop , it was a pleasure to be right next to the first monoblock that was pre heating and breaking in the output stage.
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Push-Pull-KT88-Tube-Amp.jpgMillett UniAmp: Push Pull KT88 Tube Amplifier7349 viewsPete Millett UniAmp with KT88
Transformer input (phase splitter) 6SN7 driver / 6SN7 voltage gain. Push-Pull KT88 Amplifier section. 5AR4 power supply into 47uF then 10 H (draws about 165mA from 620V CT transformer) then 2700uF @ 400VDC.
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12AX7-Golden-Dragon-Valve-PreAmp.jpgTube Preamp with Golden Dragon 12AX713806 viewsThis is a 12AX7 Tube preamp kit with many upgraded components. The tube is a Golden Dragon 12AX7. The capacitors are Sprague "Orange Drops".
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