pucho812

12V or 6V
« on: January 02, 2019, 08:14:36 PM »
current  draw  aside is there any benefit to running 12V heaters on a 12AX7 tube vs 6V heaters?
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.


JohnRoberts

Re: 12V or 6V
« Reply #1 on: January 02, 2019, 08:47:50 PM »
if the tubes don't fit you must acquit....

JR
Visit https://circularscience.com to hear what properly "cleared" drums sound like.

pucho812

Re: 12V or 6V
« Reply #2 on: January 02, 2019, 08:52:44 PM »
if the tubes don't fit you must acquit....

JR

if they don't fit just shove it in there anyway.
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.

Re: 12V or 6V
« Reply #3 on: January 04, 2019, 05:30:07 AM »
12V will normally result in more hum compared with 6V (when using an AC supply, obviously)

Audio1Man

Re: 12V or 6V
« Reply #4 on: January 04, 2019, 10:57:46 PM »
I don’t have a magic answer as other unknowns may tend me to take another path. We know that 12VAC has 2x the electric field while the 6VAC has 2x the magnetic field. What is the major pickup circuit, electric or magnetic in your design? We normally twist the heater leads to keep the magnetic fields low and the electric fields are routed away (or shielded) from the grid or other hi z  pickup places.  For preamps I generally would go for 6 VAC heaters as then both cathodes will tend to have the same electric fields. If the AC pickup is coupling into above the noise floor go for DC heaters.
Duke

buildafriend

Re: 12V or 6V
« Reply #5 on: January 05, 2019, 09:13:21 PM »
I won’t use AC heaters in preamps. When I’m using AC it’s whatever is available as long as it meets the spec for the heater or filament requirements

Cheers,


 

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