DIY Audio Projects Forum

Does anyone have a power supply circuit that would work for this!?

Any PS which produces a very quite and clean 250 -> 260V will work. Nothing special.

_________________
Projects: Oatley K272C - headphone amp in a tin can | "VoXDeuX" - Inexpensive two-way speaker | "VoXItBassO" - stereo 12" sub-woofers ]
Website: [ retro-thermionic ]

Hi all.

Is there an error on the circuit diagram? I calculate 0.4 mA of V1a plate current and 1.3 mA of V1b plate current. This then suggests (to my noob eyes) that a 5.8 kOhm resistor should be used instead of the 8.2 kOhm resistor to drop the 260 V to 250 V.

Apologies if this totally unimportant

Steve

you can use two 12 volts transformers...i built it this way and works perfect!!!
in the first transformer enter the 110 and the 12v outs to the 12 volts out the other transformer so you have 240 volts.

I just followed the original cct. But I built about 6 of them. All good!

_________________
Projects: Oatley K272C - headphone amp in a tin can | "VoXDeuX" - Inexpensive two-way speaker | "VoXItBassO" - stereo 12" sub-woofers ]
Website: [ retro-thermionic ]

This works alright. I tried it.

_________________
Projects: Oatley K272C - headphone amp in a tin can | "VoXDeuX" - Inexpensive two-way speaker | "VoXItBassO" - stereo 12" sub-woofers ]
Website: [ retro-thermionic ]

Sorry to Bother, but does anybody know where I may purchase one of these kits still?


THanks for your time,
Nicholas G.

Kits have not been available for years. You can wire them P2P or component-2-component. I have two borad made up which I can sell but they have Jensen and solen caps which are expensive. They are component-2-component wired. All you need is PS, encloure and hardware.

_________________
Projects: Oatley K272C - headphone amp in a tin can | "VoXDeuX" - Inexpensive two-way speaker | "VoXItBassO" - stereo 12" sub-woofers ]
Website: [ retro-thermionic ]

I made a component-2-component 12AX7 preamp (same as you are discussing here) with external tube PS over 12 months ago. The best preamp ever. Here are my boards. There is no additional wire used just the component wire. And of course no PCB. The caps are Jensen copper, paper and oil. The FB cap Solen.

_________________
Projects: Oatley K272C - headphone amp in a tin can | "VoXDeuX" - Inexpensive two-way speaker | "VoXItBassO" - stereo 12" sub-woofers ]
Website: [ retro-thermionic ]

Hi Everyone, It's been a while since I visited this thread. Nice build as always Mark. I like the Jupiters but would caution folks not to use the Jupiter "Vintage Tone" Caps in this circuit. They are great in guitar amps, but have a rather different sound characteristic that doesn't go well with hi-fi stuff. Even though I like this project, it is a bit more complicated than some others that I have come to prefer better. For simplicity in build and maximum performance check out the Forewatt project. Parts (notably in the PS) are easier to get. Be aware of the problems though that Benny had with using unusual tubes.

Good listening
Bruce

_________________
Some of my DIY Tube Amplifier Projects:

• PoddWatt: 5751 / EL84 Push-Pull DIY Tube Amplifier Project
• OddBlocks: KT88 Push-Pull DIY Tube Amplifiers (Mono Blocks)
• ForeWatt: ECC802S (12AU7 / ECC82) DIY Tube Preamplifier Project
• GrooveWatt: Tube (Valve) RIAA Phono Preamplifier Project