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SE 6L6 power amp, 12AT7 driver (design by Suncalc)
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Author:  mwhouston [ 26 Nov 2016, 02:50 ]
Post subject:  SE 6L6 power amp, 12AT7 driver (design by Suncalc)

I was given a couple of pairs of metal bodies 6L6(s). Some were in quite rough condition with some rust others much better preserved. I cleaned up the rustlies and applied some black high temp paint. I asked Suncalc to design me a 6L612AT7 power amp and graciously he did. I accidently bought two pairs of Psvane top of the range 12AT7s and that's why is asked for a schematic with this tube compliment. Thanks Matt.

The final schematic allowed me to use some, onhand, Edcor 10W OPTs and more especially a big Sophia Princess mesh plate (really punch plate) rec. tube. BUT I may be building the amp on a bottle gift wooden bottle box. This will restrict how I can build and what I can bring to this amp.

I have only ever stained once before. Recently I put together a tube headphone amp for a local who had bought the kit and was looking for an assembler. The blond base he wanted a deep brown stain with many varnish layers. A lot of work; sanding staining, sanding, lacquering, sanding, laquering..... I would never say the finish was perfect but it did look good and the owner liked it and the tarnished copper top (more of my handy work) plate. It made me think; I can do this!

I have a a bottle box (blond low grade timber) I'm am staining and laquering. The amp may end up in on this.
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Author:  wdecho [ 26 Nov 2016, 08:36 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

What kind of wood is the box made of. If it is pine I would reconsider. Pine does not stain well. There is some stain that would possibly work on pine but from my experience it is mostly just paint and my results were not what I wanted.

Author:  M. Gregg [ 26 Nov 2016, 15:26 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

just for interest,

you can use coffee to stain wood, it works quite well.
Tea also works.

Regards
M. Gregg

Author:  mwhouston [ 26 Nov 2016, 17:20 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

Yes it's pine. I must admit my only other staining experience was with American spruce though a very low grade. It appeared to stain well. So far it looks OK. Today I going to lightly sand after the first staining to re-stain. The stain is about the best we have in Oz and I'm paying attention to evenness. My intention is to put about five coats of lacquer.

Thanks for the coffee and tea suggestion. I use to do wedding photography and one bride stained lace on her dress with coffee just to get the right tone.

Author:  mwhouston [ 26 Nov 2016, 18:36 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

A light sand and now a second coat. Should look better once I start the lacquer coats.
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Author:  M. Gregg [ 26 Nov 2016, 18:43 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

I have never used this,

however its something I want to try (Bar top lacquer)
https://www.google.co.uk/search?q=bar+t ... CuX1ujM%3A

It seems to have a glass finish with depth that reminds me of the old TV cabinets that always seemed to be impossible to achieve.

Regards
M. Gregg

Author:  gofar99 [ 26 Nov 2016, 21:41 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

Hi Mark, funny you should mention the metal 6L6s....I just got a batch (cheaply too) of 12L6s. I was hunting for some metal triodes to go with them but they seem a bit scarce. A dual triode would be cool, but the best I have found so far are singles.

Nice box for an amp. I still prefer metal chassis with wood trim pieces or fully enclosed.

Good listening
Bruce

Author:  mwhouston [ 27 Nov 2016, 02:00 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

I really only started this because my son who I built a KT88 and Fostex speakers for gave them back and now wants to another tube amp in a wood box. But he wants to build the box. He only has a very narrow shelf for the amp.

Author:  Chris65 [ 27 Nov 2016, 08:19 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

gofar99 wrote:
....I just got a batch (cheaply too) of 12L6s. I was hunting for some metal triodes to go with them but they seem a bit scarce. A dual triode would be cool, but the best I have found so far are singles.

Don't think there were any 'metal' octal dual triodes (no pin for the metal case). 6C5, 6/12J5 & 6N7 single triodes aren't too hard to find, and usually cheap.

Author:  mwhouston [ 27 Nov 2016, 15:43 ]
Post subject:  Re: SE 6L6 power amp, 12AT7 driver (design by Suncalc)

I have some metal can 6N7s. Have them in a preamp designed by Suncalc.

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