pls help me, Buil my first AMP with 6H5C (=6AS7) tube. - diyAudio
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Old 7th September 2009, 06:20 AM   #1
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Default pls help me, Buil my first AMP with 6H5C (=6AS7) tube.

Hi All,
I have:
- 10 tube 6H5C (6AS7)
- other tube: 6H6P, 6H8C (6SN7),6H1, ECC85, ECC83....
-1 pair of OPT 1,2k:8
-PSU: sec: 220V, Pri: 70-0-290V (200ma), 140V (2,4A), 480V(1A) and 8x 6,3V(3a)
pls show me some Schematic to build a PP Amp (4 or 2 tube 6H5C/channel)
many thanks.
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Old 7th September 2009, 08:34 AM   #2
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I have experience with the 6AS7 which shows that it sounds best at 100V 100mA. Since I would recommend a PP design for decent output (7-8watts), your power supply transformer is not up to the job. You would need at least 4x100mA or about 1/2 an amp. You need at least 165V of B+ to create a decent driver stage. This means you need a power transformer capable of 130V AC and 1A.

A suitable tranformer;

www.antekinc.com/

I built such an amp which used power toroidals as interstage transformers, I would not recommend that but if you can stretch to a pair of interstage transformers(Lundahl LL1660) this is a very good and simple circuit.

Shoog

Last edited by Shoog; 7th September 2009 at 08:40 AM.
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Old 7th September 2009, 11:04 AM   #3
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Quote:
140V (2,4A)
Hey Shoog, whats wrong about lieukiem´s PT?

Looks hefty enough for me. With a LC-filter it might be OK.
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Old 7th September 2009, 01:50 PM   #4
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is this Schematic ok?
Click the image to open in full size.
Click the image to open in full size.
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Old 16th October 2012, 10:13 PM   #5
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Default 6as7 parallel push pull searching

hello guys...
I m searching for a tested schematic in order to make a parallel push pull amplifier using 6as7....
Can you help me?
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Old 17th October 2012, 05:47 PM   #6
Bigun is offline Bigun  Canada
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Just so you know, this output tube can work well SE despite recommendations to the contrary. I built mine a couple of years ago and it's still doing service as my main amp - it is surprising how well it does.

my CELLINI triode amp
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Old 18th October 2012, 01:17 AM   #7
tomlang is offline tomlang  United States
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Quote:
Originally Posted by ikaros1978 View Post
hello guys...
I m searching for a tested schematic in order to make a parallel push pull amplifier using 6as7....
Can you help me?
BinaryMike says he will have a 6AS7 PPP circuit done by the end of the year using cheap 70v line transformers here (4th post).

Parsimon: An Ultra-Cheap DIY Class AB PP Pentode Power Amp - AudioKarma.org Home Audio Stereo Discussion Forums

Here are the transformers on sale $10 USD: 30W Speaker Line Matching Transformer | TR7025-30W (TR702530W) | Distributed By MCM
These transformers calculate to 1000 p-p ohms.

I'm also waiting on more info for the build.
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Old 18th October 2012, 06:46 AM   #8
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Quote:
Originally Posted by ikaros1978 View Post
hello guys...
I m searching for a tested schematic in order to make a parallel push pull amplifier using 6as7....
Can you help me?
No need to find a "tested" "certified" "approved" or whatever schematic, all you need is study a little and undestand, then you can design your own. It is much more enjoyable this way. My opinion.
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Old 18th October 2012, 07:15 PM   #9
Bigun is offline Bigun  Canada
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+1
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Old 22nd October 2012, 07:43 PM   #10
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thanks a lot , guys.I ll inform you whatever I do!
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