Making my first hifi tube amp.

Torben · 2nd August 2010, 07:57 AM

Hi.

I wanna try making a hifi monoblock tube amp. I have two 807 tubes and one ecc83s tube, 5 powersupply transformers with a 220v primary and two secondary outputs, a 250v(20 mA) and a 6.3v(0.6 mA). I dont have an audio transformer, but will have it made when i know what i need.
I have been looking everywhere for a schematic, but no luck. Then i found this site and thought, these guys can help me for sure.

I'm thinking class AB1, because i need the power, and as far as i've read a Class A wont give me that much power.???

Hope someone can help.!!???

20to20 · 2nd August 2010, 02:35 PM

Quote:

Originally Posted by Torben

Hi.

I wanna try making a hifi monoblock tube amp. I have two 807 tubes and one ecc83s tube, 5 powersupply transformers with a 220v primary and two secondary outputs, a 250v(20 mA) and a 6.3v(0.6 mA). I dont have an audio transformer, but will have it made when i know what i need.
I have been looking everywhere for a schematic, but no luck. Then i found this site and thought, these guys can help me for sure.

I'm thinking class AB1, because i need the power, and as far as i've read a Class A wont give me that much power.???

Hope someone can help.!!???

You need to study some basic electronics formulas first. Your 20ma secondary won't power anything.

You need to understand the relationship between voltage and amperage and wattage before you spend any money on other amp parts.

807tubenut · 2nd August 2010, 02:41 PM

Indeed, I love the 807's, But 250v, and 20ma wont be enough to properly "fire" the 807's

I like mine @ 400+v

Torben · 2nd August 2010, 03:06 PM

Ok i see.. But what would do you recommend for main power then?

20to20 · 2nd August 2010, 03:32 PM

Quote:

Originally Posted by Torben

Ok i see.. But what would do you recommend for main power then?

If you have no basic electronics knowledge then your best course is to build a kit. Don't bother trying to build something from scratch. You can't take all the "advice" you will get from many people here and build something you'll understand. Get your feet wet with a small proven design. You will learn much by just looking for a kit, long before you actually buy it and build it. Go slow for now.

807tubenut · 2nd August 2010, 03:39 PM

Yup, I'm a EE/network eng by trade, and the first thing I was told to do, and that I did, was go and build a nice kit, (I built 2 or 3) and start learning tube electronics! As they are quite different from "modern" electronics.

I built a few pre-amps and 1 amp kit, try flea-bay for a good PCB based kit, then later you can move to turret boards, point-to-point wiring, and much more!

DougL · 2nd August 2010, 05:06 PM

The very best thing to do is buy a copy of "Designing valve amplifiers" by Morgan Jones.
This will walk you through 75% of the questions you have.
Next Download PSUD2 from Duncan amps. Great sanity check for power supply designs.
Also download the Tube data finder from Duncan Amps. This will allow you to find the data sheets for the tubes you have.

Good luck.

Doug

trondareo · 2nd August 2010, 10:52 PM

May I recommend Fred Nachbaur´s MiniBlok designs as some very informative writing on how to design and build a tube amp. It wont cost you much if you try to build it. Or you could just read the descriptions, they are very good. I built one and love it!

leadbelly · 3rd August 2010, 12:56 AM

Quote:

Originally Posted by Torben

5 powersupply transformers with a 220v primary and two secondary outputs, a 250v(20 mA) and a 6.3v(0.6 mA)

I think you're probably misreading some information, as I really doubt you have a 0.6mA winding. How did you determine this? It could be that your transformers are adequate.

tweakk · 3rd August 2010, 01:05 AM

I say go for this kit. TPower1

Find it here: Dantimax (elektronik) - Tube_pre-_-_poweramps

The company is in Denmark and the price is right!

2nd August 2010, 07:57 AM	#1
Torben diyAudio Member Join Date: Aug 2010 Location: Denmark	Making my first hifi tube amp. Hi. I wanna try making a hifi monoblock tube amp. I have two 807 tubes and one ecc83s tube, 5 powersupply transformers with a 220v primary and two secondary outputs, a 250v(20 mA) and a 6.3v(0.6 mA). I dont have an audio transformer, but will have it made when i know what i need. I have been looking everywhere for a schematic, but no luck. Then i found this site and thought, these guys can help me for sure. I'm thinking class AB1, because i need the power, and as far as i've read a Class A wont give me that much power.??? Hope someone can help.!!???

2nd August 2010, 05:06 PM	#7
DougL diyAudio Member Join Date: Feb 2004 Location: Wheaton IL. Blog Entries: 25	The very best thing to do is buy a copy of "Designing valve amplifiers" by Morgan Jones. This will walk you through 75% of the questions you have. Next Download PSUD2 from Duncan amps. Great sanity check for power supply designs. Also download the Tube data finder from Duncan Amps. This will allow you to find the data sheets for the tubes you have. Good luck. Doug __________________ Scienta sine ars nihil est - Science without Art is nothing. (Implies the converse as well) Mater tua criceta fuit, et pater tuo redoluit bacarum sambucus

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2nd August 2010, 02:41 PM	#3
807tubenut diyAudio Member Join Date: Jun 2010 Location: SinCity	Indeed, I love the 807's, But 250v, and 20ma wont be enough to properly "fire" the 807's I like mine @ 400+v

2nd August 2010, 03:06 PM	#4
Torben diyAudio Member Join Date: Aug 2010 Location: Denmark	Ok i see.. But what would do you recommend for main power then?

2nd August 2010, 03:39 PM	#6
807tubenut diyAudio Member Join Date: Jun 2010 Location: SinCity	Yup, I'm a EE/network eng by trade, and the first thing I was told to do, and that I did, was go and build a nice kit, (I built 2 or 3) and start learning tube electronics! As they are quite different from "modern" electronics. I built a few pre-amps and 1 amp kit, try flea-bay for a good PCB based kit, then later you can move to turret boards, point-to-point wiring, and much more!

2nd August 2010, 10:52 PM	#8
trondareo diyAudio Member Join Date: Feb 2009 Location: Trondheim	May I recommend Fred Nachbaur´s MiniBlok designs as some very informative writing on how to design and build a tube amp. It wont cost you much if you try to build it. Or you could just read the descriptions, they are very good. I built one and love it!

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