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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: 30 Mar 2010, 07:40 
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Joined: 24 Feb 2009, 03:24
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Location: USA
I prefer 5670 /6Н3П/ instead ECC......

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Hi End is back proportional to the number of composite parts!
Projects: OTL 6AS7 Gen, Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, PP 6005 Gen. Ellectric , headphone ampl. OTL Loftin White 6AS7 RCA....SE E84L& E80CC Siemens&Tel-n.
http://azazello-sound.blogspot.com/


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PostPosted: 30 Mar 2010, 07:52 
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Joined: 31 Dec 2008, 15:34
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azazello wrote:
I prefer 5670 /6Н3П/ instead ECC......

5670 and 6N3P, both double-triode tubes, with an amplification-factor around 35 ...i'll notice. Thanks azazello. :up:

Soundbrigade wrote:
Consider this as a thread where pics and descriptions of small amps could be published.
There will be no rules as amplifiers can have various sizes depending on output power and choice of tubes.

This one is small, it's build into a harddrive-cabinet: http://www.loewenkatapult.de/hrdmp10.htm . Also a PC PSU are modified to supply the tube amp. :P


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PostPosted: 30 Mar 2010, 08:26 
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Joined: 24 Feb 2009, 03:24
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Location: USA
Krammeaccoustics,
Seeing to Your schematic, I prefer use output tube maybe in UL mode, connecting second grid
to wire 4K of output transformer, disconnect feedback 22 kohm /sound will be whit more scene/
and use rectifier fast diodes BYV26E.
Good luck!

_________________
Hi End is back proportional to the number of composite parts!
Projects: OTL 6AS7 Gen, Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, PP 6005 Gen. Ellectric , headphone ampl. OTL Loftin White 6AS7 RCA....SE E84L& E80CC Siemens&Tel-n.
http://azazello-sound.blogspot.com/


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PostPosted: 30 Mar 2010, 08:36 
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Joined: 02 Mar 2009, 12:41
Posts: 1110
Location: Vänersborg, Sweden
It's a good idea using a HDD-chassis for the amp, I have had that plans for some projects, but it is defenitly to cheat by using a separate PSU. ;)

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Magnus

“If you don't know where you are going, any road will get you there.”
―Lewis Carroll


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PostPosted: 30 Mar 2010, 09:04 
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Joined: 24 Feb 2009, 03:24
Posts: 562
Location: USA
My tube guitar apl. on CDRom box /with PS/.
http://picasaweb.google.bg/azazello52/A ... 2327201490

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Hi End is back proportional to the number of composite parts!
Projects: OTL 6AS7 Gen, Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, PP 6005 Gen. Ellectric , headphone ampl. OTL Loftin White 6AS7 RCA....SE E84L& E80CC Siemens&Tel-n.
http://azazello-sound.blogspot.com/


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PostPosted: 30 Mar 2010, 09:09 
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Joined: 31 Dec 2008, 15:34
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azazello wrote:
Krammeaccoustics,
Seeing to Your schematic, I prefer use output tube maybe in UL mode, connecting second grid
to wire 4K of output transformer, disconnect feedback 22 kohm /sound will be whit more scene/
and use rectifier fast diodes BYV26E.
Good luck!

Thanks, i'm more to NF, so it's great that you tell this Azazello. Could the EL84 ( EL84 wired as a triode ) be coupled to a 2,5 k SE transformer ? i have some small one's, for this purpose. :xfingers: I've noted BYV26 as rectifiers.

Soundbrigade wrote:
It's a good idea using a HDD-chassis for the amp, I have had that plans for some projects, but it is defenitly to cheat by using a separate PSU. ;)

Thanks, it's good to know ...it bring things into perspective. :up: Then i'll throw away the empty matchstickbox and find a shoebox, for enclosure instead. :mrgreen:


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PostPosted: 30 Mar 2010, 09:29 
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Joined: 02 Mar 2009, 12:41
Posts: 1110
Location: Vänersborg, Sweden
<laughing>

I have had the idea with the submin tubes; get it all in two boxes - a smaller for the amp and a slightly bigger for the pSU, but have them stackable. I even thought of mating them electrically with the old fashion DIN connector. But I am about to use one box for the lot.

IF you want a physically small amplifier, use R-core transformers, like those available from www.vt4c.com - they are very small. Or use toroids.

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Magnus

“If you don't know where you are going, any road will get you there.”
―Lewis Carroll


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PostPosted: 30 Mar 2010, 09:41 
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Joined: 31 Dec 2008, 15:34
Posts: 441
Soundbrigade wrote:
<laughing>

I have had the idea with the submin tubes; get it all in two boxes - a smaller for the amp and a slightly bigger for the pSU, but have them stackable. I even thought of mating them electrically with the old fashion DIN connector. But I am about to use one box for the lot.

IF you want a physically small amplifier, use R-core transformers, like those available from http://www.vt4c.com - they are very small. Or use toroids.

One box is the easiest way, but two boxes is a good solution ( separation of PSU and amp ) to avoid hum and electromagnetic radiation ( shielded steelboxes ).

Magnus:
About rules "smallest possible amp", one box with all included ( checked ). :exclaim:
Will it be okay, to make it OTL ? then it's possible to get the amp small. :lightbuilb:


Last edited by KrammeAcoustics on 30 Mar 2010, 09:53, edited 2 times in total.

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PostPosted: 30 Mar 2010, 09:48 
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Joined: 02 Mar 2009, 12:41
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Location: Vänersborg, Sweden
There's no rules other than keeping it small. I remeber a cartoon where visitors at a museum were standing in front of a painting, 5ft by 7ft and the guide told the group that it was the biggest miniature painting in the world.


The thread is created just to have a place towhere to put pocs of small amps. Of course an amp with 6AQ5 can be made much smaller than something made of 845. But an 845 SE can also be made small(er) ... to a limit.

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“If you don't know where you are going, any road will get you there.”
―Lewis Carroll


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PostPosted: 30 Mar 2010, 15:34 
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Joined: 28 Oct 2009, 02:34
Posts: 501
Location: Utrecht Nederland
Hallo everybody,


well you will find this amplifier in a different thread, but the photo does fit here, too. Just like my friend Magnus, I am crazy about little amps, knowing that too small will add hum, but here is my smallest amp ever build so far. It didn't last but a few hours and someone bought it. Because it sounds so good? Hell no, because it is cute as a button and it still sounds good, but it looks very nice, I believe. I will build another one just like it for myself, hiding it, when I get guests, haha.


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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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