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"The Beast" 6336 Dual SET Amplifier
http://www.diyaudioprojects.com/Forum/viewtopic.php?f=9&t=5896
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Author:  ToddD [ 03 Jun 2018, 12:53 ]
Post subject:  Re: "The Beast" 6336 Dual SET Amplifier

Matt,
Anymore comments on its performance or changes you would consider, now that you have lived with it for awhile?

Thanks,

Author:  Suncalc [ 05 Jun 2018, 19:22 ]
Post subject:  Re: "The Beast" 6336 Dual SET Amplifier

ToddD wrote:
Anymore comments on its performance or changes you would consider, now that you have lived with it for awhile?
Not really. I don't have any changes I'd make to the electrical design. I might make the chassis a little larger just for esthetics.

I will say that the amp plays best putting out a little volume. When that's what I want, in it goes. However, when I'm just listening quietly or for background music, I'm much more likely to be listening to my 6EM7 or Marblewood depending on the music.

I will also add that the 6336 is not a quick start kind of amp. Every 6336 I've used takes at least 5 minutes to stop "tinging" and "squeaking" (the tube not the amp) and for the sound to settle down. I think this is just a function of the size and power level of the output tube. After about 5 minutes it's all good.

Author:  ToddD [ 05 Jun 2018, 19:34 ]
Post subject:  Re: "The Beast" 6336 Dual SET Amplifier

Matt,
I don't need another amp, but this looks like a fun amp. Most likely use in my garage system to play rock n roll, but may move it to the main room to play blues.

Probably purchase parts between now and Christmas and hopefully have a picture to add some time after that. I was also looking at the lacewood also. Right now I think I will build both in time.

Thanks for all you contribute to this website. This noob appreciates it

Author:  jocelys1 [ 28 Jun 2018, 04:03 ]
Post subject:  Re: "The Beast" 6336 Dual SET Amplifier

Matt's design says 2.5K OPT for this design. I have a pair of Edcor CXSE25-5K. Can these be used here ? A parallel S.E maybe ?

Author:  Suncalc [ 28 Jun 2018, 18:02 ]
Post subject:  Re: "The Beast" 6336 Dual SET Amplifier

jocelys1 wrote:
Matt's design says 2.5K OPT for this design. I have a pair of Edcor CXSE25-5K. Can these be used here ?
The short answer is yes. I would expect about 15% to 20% less power but lower distortion.

I originally played with 1.7kΩ and 2.5kΩ because I thought that the higher impedances overly constrained the big triode. I finally settled on the 2.5kΩ as the best tradeoff between power and distortion given what I generally like. The 5kΩ outputs should be very clean but about 1dB less power (not enough to worry about, IMHO).

Let us know how it goes.

Author:  jocelys1 [ 10 Aug 2018, 09:22 ]
Post subject:  Re: "The Beast" 6336 Dual SET Amplifier

Hi Matt, I'm itching to give this a go either with the CXSE25-5K I have or get the GXSE15 in your original design. Is there any way to squeeze more power out of the design ?

Will a parallel single-ended work ?

Author:  ToddD [ 07 Jan 2019, 23:00 ]
Post subject:  Re: "The Beast" 6336 Dual SET Amplifier

Update
I finished my Beast this weekend. Initial impression is that this amp has some grunt and has a full body sound. I am breaking it in, but I like it so far.

I have some photos but I am having a difficult time posting.

Thanks to Suncalc for posting your designs and the level of detail you provide in your write ups.

Author:  ToddD [ 07 Jan 2019, 23:39 ]
Post subject:  Re: "The Beast" 6336 Dual SET Amplifier

Photo of my version of the Beast.
This amp was built for my garage system so I wanted it to look kind of industrial and I may leave the wood unfinished. It is diamond tread and poplar from Home Depot.

I stuck to the schematic for the most part. I will post more details on the build later.

Author:  mwhouston [ 08 Jan 2019, 03:58 ]
Post subject:  Re: "The Beast" 6336 Dual SET Amplifier

Why not just rub the base with a little natural wood oil. It will bring up the grain and offers a little protection. Such a good build shame not to finish off the base.

Author:  ToddD [ 08 Jan 2019, 20:34 ]
Post subject:  Re: "The Beast" 6336 Dual SET Amplifier

But if I finished off the base it wouldn't match the rest of the system with unfinished speaker boxes.

As for build details. I kept it pretty close to the schematic. I decided to go with no electrolytic caps anywhere. The cap sizes as specified were not that big and I had room in the chassis for the larger size film caps. and it is something I wanted to try.

On the power supply schematic, I used a 10uf for C1 because I had one and I used 60uf motor run caps for C2, C3, and C4.

On the signal schematic, I used 1uf caps for the coupling caps because I had them. For the power tube, I used a 3.3K grid resistor and a 820 ohm cathode resistor, because I was not able to find a 910 ohm, 10 watt resistor.

Otherwise I followed the schematic and parts lists.

The amp is still burning in and I don't have it in its final location yet. So review is to come later.

thanks again to Suncalc for his level of detail and the designs he shares.

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