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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 06 Apr 2010, 07:19 
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Joined: 28 Oct 2009, 02:34
Posts: 501
Location: Utrecht Nederland
Hi guys,

I wanna try this amplifier with different tubes, maybe GU50, and see what happens. I have a 2 channel HP scope, no signal generator, but my software scope has a very good signal generator, so that will do for now. If you need that piece of software, please drop me a line and I will get some sort of FTP server going and you can download ii directly from me.

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Greetings from Holland, Ben

My DIY Audio Projects:
- Single-Ended 12B4A tube amp with ECC802S driver
- DIY Push-Pull KT88 tube amp (OddWatt amp from scratch)
- 832 / GU32 tube push-pull amplifier project


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PostPosted: 30 Mar 2013, 21:02 
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Joined: 12 Mar 2013, 06:07
Posts: 86
Location: Thunder Bay On.
I got a dumb question

what dose NFB mean


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PostPosted: 31 Mar 2013, 04:57 
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Joined: 06 Jun 2008, 18:23
Posts: 4835
Location: Australia
bsgd: Nice simple build of a nice and simple cct. This is the same cct. I used on my very first SE amp. I have built about amps using this and a slightly tweaked version of this schematic. It is just so simple and works so well. A good PS is critical for a class A SE UL amp.

Try removing the bi-pass cap on the 6N1P for a different sound (and bigger sound stage) or switch from pentode to triode mode on the power tube. Also you can plug in a few other power tubes. Try: 6V6, 6L6, EL34 (my new favorite) and 5881.

Enjoy.

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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "Mimic Carbon" - carbon resistors and PIO caps. MM phono preamp
Website: retro-thermionic


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PostPosted: 31 Mar 2013, 20:03 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
kitchi wrote:
what dose NFB mean

Negative FeedBack

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[ DIY Mains AC Power Cable Cord ] - [ Gobo LM1875 Amp Kit ] - [ Tang Band D4-1 Horn Speaker Kit ] - [ Monoblock Push-Pull KT88 Tube Amp Kit ]


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PostPosted: 01 Apr 2013, 00:42 
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Joined: 11 Oct 2011, 19:39
Posts: 195
If you need a quick signal generator, you can use a NE555 to generate a square wave. If you need more than that, look around for the XR signal generator chip. They are very versatile and cheap as well. You can build a generator with one of those for less than 20 bucks with what you have in your junk box.


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PostPosted: 27 Sep 2013, 20:42 
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Joined: 27 Sep 2013, 20:22
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Any update on this solving the high frequency issue.
Im thinking of building this amp as it seems quite simple.


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PostPosted: 01 Oct 2013, 06:22 
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Joined: 02 Sep 2008, 14:34
Posts: 527
Location: Rochester, NY
mwhouston wrote:
This is the same cct. I used on my very first SE amp. I have built about amps using this and a slightly tweaked version of this schematic. It is just so simple and works so well. A good PS is critical for a class A SE UL amp.


Mark, any links to your cct or threads in the discussion forum? I would like to be able to compare them.

mwhouston wrote:
Try removing the bi-pass cap on the 6N1P for a different sound (and bigger sound stage) or switch from pentode to triode mode on the power tube. Also you can plug in a few other power tubes. Try: 6V6, 6L6, EL34 (my new favorite) and 5881.
Swapping tubes is fun!

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Cheers, Alan
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Denon POA 2200 | Bottlehead Quickie with PJCCS | Integra CDC 3.1 | SOTA Sapphire-RG301-Grado Gold 1 | Soundwave Soliloquy Series I


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PostPosted: 01 Oct 2013, 07:40 
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Joined: 06 Jun 2008, 18:23
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Location: Australia
Just do a search on this forum for "pimp my amp". You will see the suggestions made to the basic KT88 amp to improve it. I did build two EL34 amps based on these suggestions. Both sold in a week. The owners love them.

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Projects: "Sanctum" - 12AU7 and 6AS7 direct coupled headphone amp | "retro-Oatley 6J6" - 6J6 push-pull headphone amp with OPTs | "Mimic Carbon" - carbon resistors and PIO caps. MM phono preamp
Website: retro-thermionic


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PostPosted: 01 Oct 2013, 13:59 
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Joined: 02 Sep 2008, 14:34
Posts: 527
Location: Rochester, NY
Thanks Mark. I'll get reading later today or tonight.

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Cheers, Alan
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Denon POA 2200 | Bottlehead Quickie with PJCCS | Integra CDC 3.1 | SOTA Sapphire-RG301-Grado Gold 1 | Soundwave Soliloquy Series I


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PostPosted: 19 Feb 2014, 19:47 
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Joined: 03 Oct 2012, 11:15
Posts: 11
Location: London, UK.
Hi all.

I have had a shopping list of parts to build this amp for way over a year now. The total is £375.72 and this is just the 4 transformers and a chassis, nothing else.
The only thing stopping me has been the price. The output transformers I am looking at are Hammond 1628SEA. A pair will cost £236 which makes up the bulk of the cost.

Does anyone have a better price for the output transformers or an alternative?

Cheers, John.


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