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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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Wooden-5687-Valve-Preamplifier.jpg
Wooden-5687-Valve-Preamplifier.jpg5687 Valve Line Preamplifier4211 viewsThis is the second DIY 5687 Valve Preamplifier that I built. The enclosure is a DIY wooden box and painted black.
Wooden-5687-Valve-Preamp-Rear.jpg
Wooden-5687-Valve-Preamp-Rear.jpg5687 Valve Preamp - Rear View4599 viewsMy second DIY 5687 Valve Preamp project. This one is housed in a wooden box.
6SN7-6L6-Tube-Amp-1.jpg
6SN7-6L6-Tube-Amp-1.jpg6SN7 / 6L6 DIY Tube Amp6186 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
6SN7-6L6-Tube-Amp-2.jpg
6SN7-6L6-Tube-Amp-2.jpg6SN7-6L6 DIY Tube Amplifier5777 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
6SN7-6L6-Tube-Amp-3.jpg
6SN7-6L6-Tube-Amp-3.jpg6SN7 / 6L6 Tube Amp6732 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
6SN7-6L6-Tube-Amp-4.jpg
6SN7-6L6-Tube-Amp-4.jpg6SN7-6L6 Tube Amp Top View5276 viewsTop view 6SN7, 6L6 Tube Amp.

Link to the schematics for this tube amp: Williamson 6SN7 - 6L6 (KT66) Tube Amplifier
9pin-to-octal-adapter.jpg
9pin-to-octal-adapter.jpg9 pin to octal tube adapter4471 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.
Underside.JPG
Underside.JPGPartial Wiring Close up5337 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.
2nd_monoblock.JPG
2nd_monoblock.JPGUnderbelly shot of the DIY OTL Tube monoblock4985 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
Mill_1.JPG
Mill_1.JPGFront View of the DIY OTL Tube monoblocks6470 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 )
Mill_2.JPG
Mill_2.JPGRear View of the DIY OTL Tube Amps 5196 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 )
Workshop_Heater.JPG
Workshop_Heater.JPG2nd DIY OTL monoblock being built7037 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.
Push-Pull-KT88-Tube-Amp.jpg
Push-Pull-KT88-Tube-Amp.jpgMillett UniAmp: Push Pull KT88 Tube Amplifier6568 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.
12AX7-Golden-Dragon-Valve-PreAmp.jpg
12AX7-Golden-Dragon-Valve-PreAmp.jpgTube Preamp with Golden Dragon 12AX712564 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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