Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Toxophilite on October 25, 2014, 01:18:31 am

Title: ECL 86 ?
Post by: Toxophilite on October 25, 2014, 01:18:31 am

Anybody do anything interesting with the pentode/triode ECL 86 ?
I have a few telefunkens still sealed in their original boxes. Wondering what to use them for.


Oh and could one use a EL84 single ended OT for a revibe as I have an old grundig reel to reel that might be good parts (PT and OT and choke) for a revibe build

Title: Re: ECL 86 ?
Post by: kagliostro on October 25, 2014, 02:22:12 am

This is only an example
(http://paulamps.com/Schematic6gw8.gif)


Full info here
http://paulamps.com/6gw8-2.html (http://paulamps.com/6gw8-2.html)

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One other possibility

http://el34world.com/Forum/index.php?topic=13337.msg124714#msg124714 (http://el34world.com/Forum/index.php?topic=13337.msg124714#msg124714)

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Tubenit for sure has someting of interesting to show to you


K

Title: Re: ECL 86 ?
Post by: tubenit on October 25, 2014, 07:08:53 am

This idea uses a 6BM8 but you certainly could substitute the ECL86 IF you have a lower B+ rail.

AND if you had a low enough PT like 190-0-190 with enough ma current,  ............ you could use a solid state rectifier and get the build down to just 3 tubes.

https://www.edcorusa.com/xpwr012 (https://www.edcorusa.com/xpwr012)

https://www.edcorusa.com/xpwr100 (https://www.edcorusa.com/xpwr100)

The schematic I'm showing you is pretty close to the topology on the SoLow Watt amp I built.

http://s28.photobucket.com/user/tubenit/media/SoLowWattampcab.jpg.html?sort=3&o=7 (http://s28.photobucket.com/user/tubenit/media/SoLowWattampcab.jpg.html?sort=3&o=7)

With respect, Tubenit

Title: Re: ECL 86 ?
Post by: tubenit on October 25, 2014, 07:11:57 am

There are a bunch of low watt push/pull ideas here:

http://el34world.com/Forum/index.php?topic=12526.0 (http://el34world.com/Forum/index.php?topic=12526.0)

Title: Re: ECL 86 ?
Post by: sluckey on October 25, 2014, 08:09:24 am

The Hammond AO-44 uses that tube. Here's my conversion project...

http://home.comcast.net/~seluckey/amps/PeeWee/peewee.htm (http://home.comcast.net/~seluckey/amps/PeeWee/peewee.htm)

That EL84 SE OT should work fine in the revibe circuit.

Title: Re: ECL 86 ?
Post by: tubenit on October 25, 2014, 10:03:59 am

Sluckey,

I forgot that you built that.  That's a really super nice amp design!  Thanks for sharing it!

Best regards, Tubenit

Title: Re: ECL 86 ?
Post by: DummyLoad on October 25, 2014, 01:56:50 pm

Oh and could one use a EL84 single ended OT for a revibe as I have an old grundig reel to reel that might be good parts (PT and OT and choke) for a revibe build

the OT probably. the PT probably as well, but it would be nice to know what the winding output specs are.

--pete

Title: Re: ECL 86 ?
Post by: tubeswell on October 25, 2014, 11:24:52 pm

ECL82 or ECL86 both make great reverb driver/recovery tubes in a 1 tube reverb

Title: Re: ECL 86 ?
Post by: TIMBO on October 26, 2014, 02:43:54 am

Hi Toxo, As tubeswell said, these TV type tubes were all our early amp builders could get there hands on and they made great amps with them.
http://www.ozvalveamps.org/goldentone3.htm#practice (http://www.ozvalveamps.org/goldentone3.htm#practice)
http://www.ozvalveamps.org/playmaster.htm (http://www.ozvalveamps.org/playmaster.htm)