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PostPosted: 05 May 2017, 15:24 
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Joined: 05 May 2017, 14:40
Posts: 4
Hello all,

This is my first post here.
After realizing that my first DIY audio project came from here (solid State SE Mosfet Amp) I think its only right to hope and try to contribute something to this forum.
I am not the most conservative when it comes to traditions, but I do try to stay pure to the amp.

Anyway,
Here is the newest amp I just completed.
It is a SE Triode strapped 1625.
It is made with Goncalo Alves - a sustainable tropical wood that has a class A fire rating.
The sound is very clear and transparent with nice timbre.
I designed it to put out an estimated 5W, though I need to take measurements on it.
The power supply is a voltage doubler configuration using 2 3DG4 rectifiers.
I used mainly magnet wire due to it being solid and it's high voltage rating.
Cat VI wires are used for RCA to Potentiometer due to good copper and teflon dielectric.

It has a MOV (varisistor)voltage surge protector and a current limiter (thermistor) installed as well.

All Comments and questions are welcome.


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PostPosted: 06 May 2017, 01:02 
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Joined: 06 Jun 2008, 18:23
Posts: 4833
Location: Australia
Firstly welcome to the forum. Let me start with the only bit, the only bit I don't like. I dislike bare frame trannies which are visible. Can you find a cover, do you care? Also cover the toroid while you at it.

BUT and its a BIG but, I love the amp. I think it looks excellent and has a retro feel about it. Never heard of the power tube and never heard of the timbre. But nice, really nice. Unusual way to connect partssections of the amps with the multi-way screw connectors, cant see the reason.

Good work keep it up.

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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: 06 May 2017, 11:10 
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Joined: 04 Jun 2008, 20:59
Posts: 3551
Location: Arizona, USA
Hi, Welcome to the forum. I too like the look. I too would cover the trannies. A 1625 as I recall is the 12 volt version of the 807. A common power tube often found in old transmitters. Specs are similar to a 6L6G. Voltage ratings are a bit higher though.

Good listening
Bruce

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PostPosted: 06 May 2017, 13:07 
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Joined: 08 Aug 2009, 03:11
Posts: 2159
Location: Chilliwack, BC
Lovely build! :up:

gofar99 wrote:
Specs are similar to a 6L6G. Voltage ratings are a bit higher though.


And a heckuva lot tougher. As an RF version of the 6L6, it could take peak voltages that would make a 6L6 a plasma ball :hot:

But like the 807, it takes an oddball socket.

Cheers!

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-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


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PostPosted: 06 May 2017, 17:13 
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Joined: 05 May 2017, 14:40
Posts: 4
Hi all,

Thank you for the compliments.
I kept the transformers bare for cooling. The owner (my mother) likes the bare look. This is a transformer I have used for years on my amp...so I know it's good.

The terminal strips allow for easy tweaking, changes and repair. This is also the reason for separate transformers... if one were to go...only one would have to be replaced.

I had an owner of another amp I made put in the power tube wrong, due to a broken alignment pin. It popped a bypass capacitor. I easily replaced it without any soldering. Plus I tweaked the amp several times to mate specifically to his speakers.


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PostPosted: 06 May 2017, 19:11 
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Joined: 06 Jun 2008, 18:23
Posts: 4833
Location: Australia
If it is a version of the 807 then it should be a good sounding amp. And if it's like a 6L6, a tube I have now fallen in love with, then it should be a very good sounding amp.

Once again a good looking build. What's next?

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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: 06 May 2017, 23:07 
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Joined: 05 May 2017, 14:40
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Another Triode strapped SE is next.

Either a high voltage EL34.
Or high voltage 6BQ6/ 6DQ6....Maybe even 6146's.

I already started the Hickory chassis.
Maybe I should do a step by step.... Watcha think?


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PostPosted: 07 May 2017, 02:49 
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Joined: 06 Jun 2008, 18:23
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Location: Australia
rcollege wrote:
Another Triode strapped SE is next.

Either a high voltage EL34.
Or high voltage 6BQ6/ 6DQ6....Maybe even 6146's.

I already started the Hickory chassis.
Maybe I should do a step by step.... Watcha think?


I'd go for an EL34 SE UL next. The 34s are excellent sounding tubes with the lushes mid-range ever.

_________________
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: 07 May 2017, 06:41 
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Joined: 08 Aug 2009, 03:11
Posts: 2159
Location: Chilliwack, BC
x2 for EL34, because...

rcollege wrote:
Or high voltage 6BQ6/ 6DQ6....Maybe even 6146's.


Are trickier to build with and watch the screen voltages on those ;)

Cheers!

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


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