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SE 6L6 power amp, 12AT7 driver (design by Suncalc)
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Author:  mwhouston [ 28 Nov 2016, 21:51 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

The first of the lacquer coats. Dust will always be a problem when I paint outdoors. Worst thing is I do it under a tree. Also runs proved an issue. Thank God I'm better with a soldering iron.
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PB293547 (800x600).jpg

Author:  mwhouston [ 02 Dec 2016, 20:31 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

I sanded after the first polyurethane coat. There was some prickling of the timber and then applied a second coat. I didn't re-sand but have now added a third coat of lacquer.

I'm not sure if the parts I want to use will fit in the box but I did do a rough mockup and initially it looks OK. Also I'm not sure how well the top of the box will drill seeing I need some big holes. I use a stepper drill and on other light timber this has worked OK in the past.

I have purchased a second box which I will give a light sand and beeswax. Then I will see how parts go and will this sacrificial box drill. Images to follow.

Author:  mwhouston [ 02 Dec 2016, 22:22 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

Here are some images of the new box and one after a light sand and beeswax. Good old Oz beeswax.
Attachment:
PC033548 (800x600).jpg
Attachment:
PC033550 (800x600).jpg

Author:  thehoj [ 07 Dec 2016, 16:51 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

I suppose it wouldn't provide enough gain for your power stage, but if I was going metal tubes, I've always wanted to do something with those fancy red RCA 5693 tubes.. Same as the 6SJ7 I believe. Datasheet specifies amplification factor of 19 in triode mode, the operating characteristics look pretty good from what I can tell from the datasheet.

Author:  mwhouston [ 07 Dec 2016, 18:52 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

My black metal can 6L6 are only a high temperature spray paint can away from being red. Not a bad idea though.

Author:  RossD [ 07 Dec 2016, 21:14 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

Mark, did I miss the schematic?

Author:  mwhouston [ 09 Dec 2016, 20:19 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

RossD wrote:
Mark, did I miss the schematic?

Try this: viewtopic.php?p=46470#p46470

Author:  mwhouston [ 10 Dec 2016, 18:50 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

An image of the two boxes for the amp. I am hoping to try my drilling techniques with the blond box before drilling big holes in the stained and finished box. But as you can see the two timbers are quite different. Drilling one may not predict what will happen when you drill the other. But ill give it a fare crack.

Attachment:
PC113556 (800x600).jpg

Author:  mwhouston [ 10 Dec 2016, 20:42 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

A possible internal layout. Filament tranni into a step up for the HT.
Attachment:
WP_20161211_12_16_19_Pro_LI (800x449).jpg

Author:  mwhouston [ 26 Dec 2016, 19:43 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

This project has stalled a bit. I'm was managing three projects. One was completed a short time back, the LM833 phono preamp, one half finished - a re-hack of an early chip amp, and one other completely stalled but dividing my attention.

The sacrificial wood box for the 6L6 amp was lightly sanded and beeswaxed. The other day I had to move it and realised it felt furry. The beeswax had caused the prepped timbre to prickle. I cant use sand paper as it will just clog with the beeswax so I used a rough metal pot scrubber. A very light wiz over with the scrubber removed the prickle and then I applied another beeswax layer.

Should be fine now.

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