DIY HiFi Forum

Posted by NewbieBaby (A) on April 27, 2008 at 14:34:55

I have received the DIY HiFi Supply Ltd. Ultra Low Noise Filament Supply, and I have some questions:

I have the on-line spec/info sheet and refer to it below.

My application is a Dynaco ST70 converted to operate PP DHT 6B4G instead of PP EL34. Power trans has 2 sets of 3.15V - 0V - 3.15V windings (one set for each side of 2 tubes). The 3.15 legs are connected to the tube filaments for summed 6.3V. 6B4G spec is 6.3V for filament connections. The 0V center tap(s) for the filament windings go through a 750 Ohm cathode bias resistor to ground

About the AC winding wires, the spec/info sheet states “these wires should be floating (ie no centre tap connected to ground)”
?? I interpret that my current [ filament AC center tap > cat bias R > ground ] circuit topology is not appropriate for use with the DIY filament supply; is this interpretation correct?
?? I interpret that the for use with the DIY supply the circuit topology should reflect the spec/info sheet illustration showing the cathode resistor connecting directly to pin 1 of power tube(s)and ground, and the 0V center tap(s) remain(s) unconnected. Are these interpretations correct? In this context, how is the value of the cathode resistor established?

The spec/info sheet states: “The device needs about 1 to 1.5V headroom to regulate ...”
?? Since my power trans filament windings are nominally 6.3V, and the 6B4G filament V requirement is 6.3V, how can I concurrently satisfy the device headroom requirement and the tube filament requirement?

The spec/info sheet give two "options" for mode of operation: "Traditional Regulator" and "VCCS Regulator". I interpret that the delivered device is set up as VCCS Regulator.
?? Is this correct?

Thank you for your time.

• Update - NewbieBaby 12:47:17 05/04/08 (1)
  • RE: Update - bcherry 19:48:56 05/04/08 (0)
• Quick notes - Thorsten 04:01:25 05/02/08 (3)
  • Your response is most appreciated - NewbieBaby 04:23:03 05/02/08 (1)
    • RE: Your response is most appreciated - Thorsten 04:35:10 05/02/08 (0)
  • POST SCRIPTVM - Thorsten 04:04:24 05/02/08 (0)
• Fired it up, no smoke, no joy though - NewbieBaby 21:13:32 05/01/08 (2)
  • RE: Fired it up, no smoke, no joy though - bcherry 22:10:12 05/01/08 (1)
    • In an original response below, - NewbieBaby 04:09:17 05/02/08 (0)
• How about them 0.47 Ohm resistors - NewbieBaby 07:23:39 05/01/08 (1)
  • RE: How about them 0.47 Ohm resistors - bcherry 22:05:29 05/01/08 (0)
• RE: Have DIY HiFi Filament Supply and questions - bcherry 22:04:34 04/28/08 (2)
  • RE: Have DIY HiFi Filament Supply and questions - NewbieBaby 10:52:25 04/29/08 (1)
    • RE: Have DIY HiFi Filament Supply and questions - bcherry 22:02:07 05/01/08 (0)

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