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[Unison845]

250TL amplifier

Not very popular tube for amplifier. Eimac 250TL amplifier with Tamura transformer, output 20W SE. Frequency response at full power 20W. I am surprised of the measurement, because the bass did not sound as deep as measured. In fact my other 845SE measured worse in the bass but sound much much better.

Unison845 and Soundstorm: off the planet!!

 

[JP]

This is SY's HMN using Jack's boards. The XLRs are for the phono and the rest of the inputs are passive. The last pic is the layout test before making it pretty - there's a Landfall Systems chassis under there.

 

[mhouston]

Jpjones3318: classy build.

 

[SY]

It looks a bit better than mine...

 

[6L6]

It looks fantastic! I would love to see it in person...

 

[JP]

That could be arranged, though would need to happen within the next couple weeks, after which it'll be in the possession of the person I built it for.

 

[planet10]

It looks a bit better than mine...

It probably looks ALOT better than yours

dave

 

[SY]

OK, I can concede that point. My current version is built into the cabinet of an old subwoofer amp...

 

[JP]

It took me ~8 hours to machine each of those corner pieces. The build for the BK Lounge in Austin was far easier.

My next builds will follow SY's methodology.

 

[mhouston]

Single stage tube preamp with jFet buffer

In order to drive a UX-171A power amp, with an input impedance of 400ohms, I added a Pass B1 to the back end of a tube preamp. This is all contained in a 2U 19" rack enclosure. Three inputs on the back and a classy black stippled finish enclosure. Alps pot and 4oz brass knob. Matches my tube and chip amp ("Number 9") in looks front and back. First image is Number 9.

 

[TheTubeAmper]

In order to drive a UX-171A power amp, with an input impedance of 400ohms, I added a Pass B1 to the back end of a tube preamp. This is all contained in a 2U 19" rack enclosure. Three inputs on the back and a classy black stippled finish enclosure. Alps pot and 4oz brass knob. Matches my tube and chip amp ("Number 9") in looks front and back. First image is Number 9.

What tube is that and at what voltage? Or a schematic would be nice.

 

[mhouston]

What tube is that and at what voltage? Or a schematic would be nice.

OK. A schematic to be posted. I got the original from Audio eXpress many years ago and swore I would build it. I now have a few pairs of UX-171A tubes and 80 rec. tubes. Here is an images of the amp. The base is a 1940s flower pot base.

 

[davorin]

Small stereo push-pull amplifier with 2x6DZ7 and 2xE80CF tubes build on kitchen curtains!

 

[mhouston]

Small stereo push-pull amplifier with 2x6DZ7 and 2xE80CF tubes build on kitchen curtains!

Curtains?

 

[overtheairbroadcast]

Curtains?

Probably meant, "counters".

Just means either auto-correct was too handy or a dictionary wasn't.

 

[davorin]

Sory for bad english! Maybee is bether "kitchen chopping board"!

 

[mhouston]

Sory for bad english! Maybee is bether "kitchen chopping board"!

I have built a number of amps on cutting boards, chopping boards and bread boards. There is some nice cheap wood boards out there that make great amp top plates.

 

[Triodethom]

Small stereo push-pull amplifier with 2x6DZ7 and 2xE80CF tubes build on kitchen curtains!

Nice interesting transformers.

 

[davorin]

Nice interesting transformers.

Thanks, transformers are my home work!

 

[felixx]

Jpjones3318
Looks very good and the TKD attenuator used is one of the best ...built to last forever.
I use it similar in this preamp:
https://picasaweb.google.com/115586837612433686520/MyPreamp#