Maximum DIY contents in the whole rig and never sounded this good….

[yogibear]

No feedback and dual monoblocks sounds like a great recipe for awesome sound

Pure Class A operation too…

Setting up a test bench. More precision instruments to be installed soon on a separate desk.

Already tested EL84 SE, EL34 SE, 6GB6 SE, all class A, no feedback. Next in line is 300B SET:



Things are turning up quite exciting ! All amps will be tested.

 

[yogibear]

Latest build 6X4 tube rectified 6SN7 Triode preamplifier with volume a gain control and a 3 source selector switch. This marks 50th Tube build in last 10 years.

 

[srinisundar]

Wow. Congrats on your 50th tube build and also a active DIYer.

 

[Hari Iyer]

Latest build 6X4 tube rectified 6SN7 Triode preamplifier with volume a gain control and a 3 source selector switch. This marks 50th Tube build in last 10 years.

View attachment 89579

Own or published design?

 

[yogibear]

Own or published design?

Own power supply execution of a copy righted design. Electra Print Audio.

 

[grindstone]

That ultrapath one that sits on a stack of diodes? Cool. Those UP caps are touchy and I was never happy with anything but old ASC motor runs (still oil, not wax) which got insane big for the high C value and even then wished I could try better boutique jobs. It was just all too much & too big for a one-tube pre (and still having phono pre!)--gave it up and threw more gain in the front of the amp with one more supply rail RC and bada-boom One of my many educational dead-ends that were fun when working crazy-hard to mix "seasoning" parts was fun. DC heater, too er no? Just wondering, no need to answer if it's all double top-secret. Congrats on another build--that's a lot of hole-punching and burr-filing, man

 

[yogibear]

That ultrapath one that sits on a stack of diodes? Cool. Those UP caps are touchy and I was never happy with anything but old ASC motor runs (still oil, not wax) which got insane big for the high C value and even then wished I could try better boutique jobs. It was just all too much & too big for a one-tube pre (and still having phono pre!)--gave it up and threw more gain in the front of the amp with one more supply rail RC and bada-boom One of my many educational dead-ends that were fun when working crazy-hard to mix "seasoning" parts was fun. DC heater, too er no? Just wondering, no need to answer if it's all double top-secret. Congrats on another build--that's a lot of hole-punching and burr-filing, man

Above is tube rectified and no diodes and no motor run caps and not even higher microfarad MKP caps (though I have stock of EU made 100 grams MKP high voltage caps too) Only high quality electrolytes and loads of them but multiples of moderate values bypassed by some high quality low value mkps….

I like my builds to be dead silent and AC heaters on the amps and DC for the preamps. The other version of this preamp is transformer coupled output, again a Jack Elliano design.

Third is my own design and is a DHT, rectified by a DHT.

Yes, one phono pre is nearly complete and two more designs are planned and may be one SS Phono Pre based on Germanium transistors.

 

[Hari Iyer]

It's quite easy to design a tube amplifier or any linear power supply if you learn how to use PSUD2 to design. Otherwise it's a nightmare.

 

[yogibear]

Bench tested a new build, Phono preamp today. Two 12AX7 tubes and one 12AU7 tube with RIAA. Tamura irons at power supply. Even without proper encasing hum or noise is not noticeable. Excellent output. Played directly connected to tube amp.

 

[yogibear]

Next stint is assembly and voicing of a new R2R DAC, chipless. It accepts optical, usb and coaxial inputs and I prefer to use it with usb to optical converter. It’s a 24 bit, non oversampling.

On the pine wood test bench !

 

[grindstone]

OK -- do I win if I guess your next thing is an outboard clock for everything

Just fooling...congrats on the stack and thanks for posting. Carry-on.

 

[yogibear]

OK -- do I win if I guess your next thing is an outboard clock for everything

Just fooling...congrats on the stack and thanks for posting. Carry-on.

Nope. That’s an expensive affair and kind of rabbit hole. I keep things simple. The laptop is already optimized for audio by the FM, we all know. Regular tweaks have taken the playback to another level.

Next could be balanced R2R and I would look at the possibility of replacing the opamps with Tamura Output transformers, 600:600.