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    • Home
    • WELCOME to DEATHTUBE 667
    • Green God: Manifesto SE
    • Green God: Son of God
    • Green God : Born Again
    • SE Output Stage Only Amp
    • SE DC Breadboard Amp
    • Magnavox S-8756 Speakers
    • DT667's Altec Mini VOTT's
    • Electrohome Speakers
    • Penncrest SE 50C5 AMP
    • Altec 34627 Diaphragm Kit
    • ARTA Interface
    • New Magnetics by The MLP
    • SE DC E-Linear
    • SMPS DC Heater Supply
    • Preamps & Headphone Amps
    • SE 2A3 schematics
    • Montana SE Amp Shootout
    • High Voltage Amp Parts
    • PSE 6SN7 DC 6SN7 AMP
    • LSES Experiment SE 6CB5
    • The RH84 experiment ...
    • SE 7B4 DC 2A3 Experiments
    • Mullard 3-3 6V6 6SJ7
    • Early LSES Experiment
    • SE Design & Construction
    • Low DCR Filter Chokes
    • Flywheel or LSES Filter?
    • Hammond Power Transformer
    • Feedback in SE Amplifiers
    • Deathtube 667 Biography
    • Contact DEATHTUBE 667
  • Home
  • WELCOME to DEATHTUBE 667
  • Green God: Manifesto SE
  • Green God: Son of God
  • Green God : Born Again
  • SE Output Stage Only Amp
  • SE DC Breadboard Amp
  • Magnavox S-8756 Speakers
  • DT667's Altec Mini VOTT's
  • Electrohome Speakers
  • Penncrest SE 50C5 AMP
  • Altec 34627 Diaphragm Kit
  • ARTA Interface
  • New Magnetics by The MLP
  • SE DC E-Linear
  • SMPS DC Heater Supply
  • Preamps & Headphone Amps
  • SE 2A3 schematics
  • Montana SE Amp Shootout
  • High Voltage Amp Parts
  • PSE 6SN7 DC 6SN7 AMP
  • LSES Experiment SE 6CB5
  • The RH84 experiment ...
  • SE 7B4 DC 2A3 Experiments
  • Mullard 3-3 6V6 6SJ7
  • Early LSES Experiment
  • SE Design & Construction
  • Low DCR Filter Chokes
  • Flywheel or LSES Filter?
  • Hammond Power Transformer
  • Feedback in SE Amplifiers
  • Deathtube 667 Biography
  • Contact DEATHTUBE 667

Adjustable B+ Power Supply Part 1

Superior Electric Powerstat 10C

For my next breadboard amp project, I wanted the ability to adjust B+ voltages but I didn't need  DC voltage regulation. 


On EBay, I found a Superior Electric Powerstat 10C rated for 120VAC &  2.25A. 


The Powerstat variac autoformer will go between the AC Line IEC socket and the 800VCT B+ transformer that I recently purchased. 


This seemed like a safer alternative that using a dropping resistor on the HOT side of the AC line.


DT 667   July 2019



Adjustable B+ Power Supply Part 2

Powerstat 10C Installed on Breadboard

I received the Powerstat 10C autoformer and installed it in my SE DC 6AQ5 project breadboard circuit on 7/9/2019.  Wired up the  B+ and filament transformers to run off one AC line IEC socket, each transformer having its own power switch and indicator lights. Important for a directly coupled circuit.


This robust variable transformer does the job and compared to my older TENMA 15A variac is totally silent during operation. No hum or mechanical buzzing of any kind.


Very easy to adjust B+ by turning the control knob which operates perfectly. 


DT 667 July 10, 2019

GE 800VCT Plate Transformer

High Voltage B+ Transformer


I was searching for a  B+ transformer that would allow me to generate 480-500VDC with a 5U4G directly heated tube rectifier.


EBay had a GE Plate Transformer : 800VCT @ 300mA Weight 20LBS for $52, so I bought it. The 300mA DC rating is probably a bit conservative.

Hammond has a similar model that weighs 12-13LBS and is rated at 535mA.


The GE transformer should function well in a SE 7B4 DC 2A3 stereo circuit, should I decide to work on that project in the future.


DT 667   June 2019



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