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About heater regulated supply
About heater regulated supply
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Old 11th March 2019, 02:06 PM   #11
Eli Duttman is online now Eli Duttman  United States
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Victor, many commonly used preamp tubes operate at either "6" or "12" V. Building a 12 V. regulated supply is very easy. "Full wave" voltage double 6.3 VAC, using 2X Schottky diodes into a large valued cap. stack. Follow the rectifier setup with a 7812 3 terminal regulator. The AC RMS current capability of the filament trafo should be 4X the 12 VDC draw.
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Old 11th March 2019, 02:20 PM   #12
kodabmx is offline kodabmx  Canada
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About heater regulated supply
Half the price, and almost twice the current:

MIC29752WWT Microchip Technology | Integrated Circuits (ICs) | DigiKey

Last edited by kodabmx; 11th March 2019 at 02:35 PM.
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Old 12th March 2019, 06:34 AM   #13
refference is offline refference  Brazil
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Hi Victor ,

You do not need to spend USD$ 59.00 (!!!!) to have good regulation and low ripple in a simple "heater voltage regulator" !!! It's a waste of money !!! Use the simple , easy do find and cheap LM317T voltage regulator !!! The circuit use only two resistors , one capacitor and two diodes !!! The circuit is on the manufacturer's datasheet , and you will find it here : Datasheet4U.com - 900,000+ datasheet pdf search and download
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Old 12th March 2019, 06:56 AM   #14
mindutis is offline mindutis  Sweden
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LM317 does not always work, same with LM337. Cold heater inrush current activate overload protection. Not with all tubes, but with some it will happen.

I always thought that well filtered heater supply is better than simple AC. Yes it is more simple with AC and it quite works well with a separate heater in a tube bulb. It also depends on an amplifier topology of course, a hard driven tube can add an intermodulation products etc.
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Old 12th March 2019, 07:33 AM   #15
refference is offline refference  Brazil
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Quote:
Originally Posted by mindutis View Post
LM317 does not always work, same with LM337. Cold heater inrush current activate overload protection..........
I'm sorry to say that Mindutis , BUT you are completely wrong !!! If you operate the LM317T within their current limits (with conservative values) may be 0,7 Ampére (+/-) at nominal tube heater voltage and nominal tube current demand , the overload protection WILL NOT act !!!! If the current demand is bigger than that you can use 2 separate pcs of LM317T , you will save a lot of money and get a very fiable source of heater voltage !!! ALL of my preamplifiers ( I made them to sell) use this system and NEVER had any kind of problem !!!! Listen to my experience !!! It will work fine !! OK ???
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Old 12th March 2019, 08:04 AM   #16
victordascalescu54 is offline victordascalescu54  Romania
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Thanks a lott, I intend to use two of them as I am working at my Anzai SRPP which consist in 4xEcc83 + 2xEcc82 aprox 1 Amps needed.

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Old 12th March 2019, 08:38 AM   #17
Eli Duttman is online now Eli Duttman  United States
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Regardless of which heater voltage is settled on, a 4 A./6.3 VAC filament winding is needed to power the supply. However, if a voltage doubler is employed, a single 1.5 A. version of the 7812 regulator will be adequate, provided it is well heat sinked.

2X of Taiwan Semiconductor's SR510 Schottky diode will easily handle the rectifying chore.
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Old 12th March 2019, 02:16 PM   #18
Tubelab_com is offline Tubelab_com  United States
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Half the price, and almost twice the current:

The Micrel / Microchip MIC29752WWT regulator linked to in this post is "not recommended for designs" on page 3 of it's own data sheet.

The TO220 versions, one of which is good for 5 amps are not on the endangered species list. I can confirm that one MIC29502 will run a pair of 2A3's with a dropout voltage of about half a volt. The large heat sink to the left of the 2A3's is for the regulator and the smaller heat sink is for the dual Schotkey diode that provides FWCT rectification from a 6.3V CT winding. I haven't tested to see if there is enough headroom for 6.3 volt filaments from 6.3V feeding a FWB yet, since it's not necessary in my application.
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Old 12th March 2019, 02:34 PM   #19
popilin is offline popilin  Argentina
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Quote:
Originally Posted by victordascalescu54 View Post
Thanks a lott, I intend to use two of them as I am working at my Anzai SRPP which consist in 4xEcc83 + 2xEcc82 aprox 1 Amps needed.
What voltage is available for filaments on the transformer winding?

LM317 is a bit noisy, but ECC82 and ECC83 are a bit noisy either so I think that the LM317 is enough for the task.
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Old 12th March 2019, 02:41 PM   #20
victordascalescu54 is offline victordascalescu54  Romania
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Quote:
Originally Posted by popilin View Post
What voltage is available for filaments on the transformer winding?

LM317 is a bit noisy, but ECC82 and ECC83 are a bit noisy either so I think that the LM317 is enough for the task.
I have more than 17 V DC after the rectifier, but I think to take a chance with LT1084
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