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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: 23 Mar 2010, 01:32 
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man... those are big amps.

C


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PostPosted: 23 Mar 2010, 01:37 
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Can you show me the Schematic ? what tubes are you using with the breadboard amp ?

Cal

cheap-Jack wrote:
I think I have breadboarded the world's "smallest possible amp" & also 'simplest possible amp' todate - a one-stage MM cartridge tube phonostage/passive linestage. I have enjoying listening to it for many months, seated it right on top of the metal mesh top cover of my super-upgraded Dynaco ST-70 power amp. I just take it easy as it is a breadboard anyway.


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PostPosted: 23 Mar 2010, 03:19 
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Location: Vänersborg, Sweden
Some of my smaller amps.
This one is a PP 6AQ5-amp. Irons are Edcor and an old Heathkit. Design is from Frank Nachbaur.
Size is approx 6" by 7" by 2".
Image


I accidently managed to obtain an aluminium plate for mounting tube sockets from vt4c.com. If I use this right and I design a new chassis, I think I can make this amplifier much more compact.
Image

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PostPosted: 23 Mar 2010, 15:25 
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And this will be a 6AQ5-SE amp.
Image

All is mounted a smallish piece of aluminium
Image

And the mains transformer (an R-core tranny from VT4C.com) on the underside.
Image

I wanted to make a wooden chassis, but this is a bit too big. Or not. :confused:

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“If you don't know where you are going, any road will get you there.”
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PostPosted: 23 Mar 2010, 15:37 
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CrazzyAbtTubes wrote:
If you have any pictures of this phono stage

Hi.

NO, but I can easily take some 1080P HD images of the tiny phono/linestage breadboard. But I don't know how to post them here, being pretty new here.
CrazzyAbtTubes wrote:
what tubes are you using

Using one only vintage Telefunken ECC83, just 50-years-plus young. Still kicking around like a kid!
CrazzyAbtTubes wrote:
how much gain do you actually get from it?

Good question. Only half tube for one-stage RIAA amp per stereo channel, with 440V HV to get the max votage gain. Of couse, it does not provide the enough dB gain as per all the textbooks on this planet. But my question is: how much dB gain do we really NEED considering there are always voltage gain stages in those active linestages/power amp hooked up downstream ??????

I know zillion tube DIYers may step up showing me the finger, citing it is impossible technically to get a single-stage RIAA working. But I have edone, with high flying colours last summer.

It sounds so airy, & transparent that it makes my super-upgraded Dynaco SP-2 (again with 50-year-plus young Telefunken ECC83s) a shame, sonically.

GAIN is not everything. Less gain, more headroom, more music. My very picky ears tell me so.

c-J

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PostPosted: 29 Mar 2010, 22:19 
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Hi Magnus,
This small Amp thread is just what I needed to fulfill my apatite !
I looked at pictures that you posted, Do you have the specs. on this amp that you built 6AQ5-SE ?
I was thinking about building this amp as a starting project.
Just a thought...

Robbie


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PostPosted: 30 Mar 2010, 02:51 
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No specs, but a schematic possible ....( :confused: :confused: :confused: )


....here I have it but ... :confused: ... I have forgotten what schematic I am using. :x

Any of these, but they are very similar:
http://www.pastisch.se/EF/6AQ5SE-1.gif
http://www.pastisch.se/EF/6AQ5SE-2.gif
http://www.pastisch.se/EF/6aq5.gif
http://www.pastisch.se/EF/amp.gif
http://www.pastisch.se/EF/se6aq5schem.gif

Plz, not that the power figure of 4W is propably ovverrated. 2,5W is maybe more relevant.

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“If you don't know where you are going, any road will get you there.”
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PostPosted: 30 Mar 2010, 05:59 
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Soundbrigade wrote:

Heja 8-)

It seems that the two last link, are the same schematics, as the two first link. :geek:

Do you have any good links, to some "very simple" SE amp's, with ecc83 / el84 ( 12ax7 / 6bq5 ) ?


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PostPosted: 30 Mar 2010, 06:31 
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Location: Vänersborg, Sweden
I am no fan of ECC83, though the tube may have a function in a phono amp, so what I have uses all kinds of tubes for drivers (even the ECC83). I have not sorted the schematics:

http://www.pastisch.se/faktiskt/6bq5sch.gif
http://www.pastisch.se/EF/1961_02_1.gif
http://www.pastisch.se/EF/1961_02_2.gif
http://www.pastisch.se/EF/amp-pcb.gif
http://www.pastisch.se/EF/amp.jpg
http://www.pastisch.se/EF/C_spsq5.jpe
http://www.pastisch.se/EF/el84_2.gif
http://www.pastisch.se/EF/el84_3.gif
http://www.pastisch.se/EF/plan.jpg
http://www.pastisch.se/EF/sch.gif

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PostPosted: 30 Mar 2010, 07:28 
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Soundbrigade wrote:
I am no fan of ECC83, though the tube may have a function in a phono amp, so what I have uses all kinds of tubes for drivers (even the ECC83). I have not sorted the schematics:

Thanks Magnus, i like this simple one:
http://www.pastisch.se/EF/C_spsq5.jpe :up:

Actually, the two ECC83 i've still got back, are coming from a L.A Audio RIAA, that i'm not using, because i don't have a turntable anymore.

Should i prefere schematics with ECC82 or ECC81, in combination with EL84, instead of ECC83 ? :trumpet:


Last edited by KrammeAcoustics on 30 Mar 2010, 07:53, edited 1 time in total.

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