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Speaking of dangerous voltage. The 304tl is alive!

108.247.77.70

Posted on May 4, 2020 at 17:35:48
Chip647
Audiophile

Posts: 2633
Location: The South
Joined: December 24, 2012




+100 lbs, each stack (I need wheels)
The big big Hammond OPT
5 independent power supplies per side B+ 1,100v @ 120mA
2 Mean Well 5v power supplies per tube
6SN7 Interstage 304tl

First hour was a little muffled but then it opened up.

Dead quiet at idle.
It makes me smile




One channel (There is a cover for the power supply)

 

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Cool! Watts per channel? nt, posted on May 4, 2020 at 18:04:50
vinnie2
Audiophile

Posts: 4481
Location: North Carolina
Joined: September 28, 2013
nt

 

If i turn it up to 200mA I estimate the upper 20s, posted on May 4, 2020 at 19:39:53
Chip647
Audiophile

Posts: 2633
Location: The South
Joined: December 24, 2012
It is a very stout amp.

The used tube I am testing with has one of the four filaments open. Pretty cool that the other three are unaffected and the tube can still be used. It opened the second time I powered up the tube.

The first old tube I used was fine until 50mA then it went to full plate short. I had a meter on it when it was shorting and the tube was pulling over 2 amps out of the 1,100 volt supply. It is overbuilt.

 

RE: Speaking of dangerous voltage. The 304tl is alive!, posted on May 4, 2020 at 23:53:50
Stephen R
Audiophile

Posts: 1427
Joined: January 11, 2002
Fantastic job. Have you a circuit you can show. Casters are almost a necessity under a boat anchor like this.

 

RE: Speaking of dangerous voltage. The 304tl is alive!, posted on May 5, 2020 at 03:54:31
vinnie2
Audiophile

Posts: 4481
Location: North Carolina
Joined: September 28, 2013
Just have to ask.... why that tube?

 

very cool chip, posted on May 5, 2020 at 08:54:56
Posts: 892
Joined: June 16, 2006
I once wanted to use this tube in a amp, then I decided to switch to the 75tl. I haven't
built it yet but it is still on the "to do" list. I love eimac tubes.

Cal

 

Why would someone use a giant thoriated tungsten triode that looks like that?, posted on May 5, 2020 at 13:53:28
Chip647
Audiophile

Posts: 2633
Location: The South
Joined: December 24, 2012
Because it is cool.

And they sound good.

And it is really hard to build.

 

My main amp right now uses a 35t Eimac, posted on May 5, 2020 at 13:57:07
Chip647
Audiophile

Posts: 2633
Location: The South
Joined: December 24, 2012
I have a 100TH bread boarded with a MOSFET driver. The TL tubes are easy to drive. They are definitely worth it as they have a type of sonic and physical presence that draw you in.

Hardest part is trying to build in enough safety.

 

RE: Speaking of dangerous voltage. The 304tl is alive!, posted on May 6, 2020 at 21:00:06
Iain42
Reviewer

Posts: 895
Location: Arcansaw
Joined: February 10, 2004
Can you give info on the output transformer? Model number? Size? They look HUGEMONGUS!!!



High sensitivity, wide dynamic range, low distortion, and smooth frequency response. Pwk

http://www.itishifi.com

 

All good reasons! NT, posted on May 7, 2020 at 18:39:18
vinnie2
Audiophile

Posts: 4481
Location: North Carolina
Joined: September 28, 2013
nt

 

RE: Speaking of dangerous voltage. The 304tl is alive!, posted on May 8, 2020 at 17:26:52
Chip647
Audiophile

Posts: 2633
Location: The South
Joined: December 24, 2012



The monster 1642SE Hammond
It is bigger than life, 28 Pounds.

 

RE: Speaking of dangerous voltage. The 304tl is alive!, posted on May 9, 2020 at 13:36:41
griboon
Audiophile

Posts: 449
Location: Lynchburg Va.
Joined: October 14, 2003
That is just incredible! You should feel ecstatic with what you did. Damn son not many go that far and that is why this place exists and why I exist as well! Thank you for that!

 

RE: Speaking of dangerous voltage. The 304tl is alive!, posted on May 11, 2020 at 11:47:57
Iain42
Reviewer

Posts: 895
Location: Arcansaw
Joined: February 10, 2004
Good grief LOL!!!!!!!!!!
Thanks for the pic..
High sensitivity, wide dynamic range, low distortion, and smooth frequency response. Pwk

http://www.itishifi.com

 

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