Preamp tube DC heater circuit - Page 2 - Electronic Circuits Projects Diagrams Free

Roff · 24th October 2009, 03:48 AM

Quote:

Originally Posted by gabeNC

Dude... this is more than a preference... it's a Jihad!

Not for me. I have a tin ear, and could give a rat sass.

Andrew Leigh · 25th October 2009, 05:39 AM

To the OP,

make sure you follow convention with the wiring. Keep the two wires twisted and as close to the valve sockets as possible. Solid hookup wire is prefered so that you can position the twisted pairs and keep them there.

Cheers

MikeMl · 25th October 2009, 06:59 AM

Quote:

Originally Posted by Andrew Leigh

To the OP,

make sure you follow convention with the wiring. Keep the two wires twisted and as close to the valve sockets as possible. Solid hookup wire is prefered so that you can position the twisted pairs and keep them there.

Cheers

Now you got me going. Why bother twisting filament wires if the OP is powering them on DC? Twisting the filament wires is supposed to be a hum-bucking technique, but it can only apply if the filaments are heated with AC.

Mr RB · 25th October 2009, 07:34 AM

Won't it stop externally induced currents INTO the heater?

Andrew Leigh · 25th October 2009, 10:17 AM

Mike,

I did not read the OP message properly and missed the "regulated part", my bad.

Andrew

**Nigel Goodwin** · 25th October 2009, 01:00 PM

Quote:

Originally Posted by MikeMl

Now you got me going. Why bother twisting filament wires if the OP is powering them on DC? Twisting the filament wires is supposed to be a hum-bucking technique, but it can only apply if the filaments are heated with AC.

Quite right - no need to do it for DC heaters - wxcept it looks pretty cool

Roff · 25th October 2009, 03:32 PM

Quote:

Originally Posted by Mr RB

Won't it stop externally induced currents INTO the heater?

Potentially, but the heater/cathode thermal time constant is so long that any current induced would not have a measurable effect on cathode emission.

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25th October 2009, 05:39 AM	#17
Andrew Leigh	To the OP, make sure you follow convention with the wiring. Keep the two wires twisted and as close to the valve sockets as possible. Solid hookup wire is prefered so that you can position the twisted pairs and keep them there. Cheers

25th October 2009, 07:34 AM	#19
Mr RB	Won't it stop externally induced currents INTO the heater?

25th October 2009, 10:17 AM	#20
Andrew Leigh	Mike, I did not read the OP message properly and missed the "regulated part", my bad. Andrew