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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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PostPosted: 04 Jan 2017, 13:04 
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Looks like the stain turned out rather well!

A trick I have recently learned (ironically from Matt aka Suncalc) is to use a coat of 1/2# wax free shellac (Zissner cut 50% with Alcohol) as a sanding sealer before stain. Really helps those difficult to stain woods. I also use it (uncut if not staining) before finishing with varnish oil blends (True Oil, Danish Oil, etc). Works well to prevent uneven coloring (blotching), and to get finish to adhere and cure on oily hardwoods like rosewood.

Make sure to study up on Matts vertical amp build before final layout & wiring.

Cheers,
Dan


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PostPosted: 04 Jan 2017, 13:07 
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After sanding, rub with a damp cloth (mineral spirits or water) to raise the grain (prickle) then lightly sand smooth again with fine paper (220 grit or higher) before applying beeswax / paste wax / finish.


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PostPosted: 04 Jan 2017, 17:54 
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I was amazed beeswax caused a prickle but easily fixed. My staining and lacquering job is a bit rough but I'm fine with that. I'm still trying different component layouts so no progress currently. Had to put some new T3 class D modules in an amp and other chores which has kept me from this project.

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Projects:”Calibre 834” - tube phono MM preamp | ”najah” - Raw 180W Tripath Class D power amp | "Icon" - Shuguang CV-181Z preamp | "Njira" - 180W Tripath Class D power amp


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PostPosted: 05 Jan 2017, 12:11 
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I have found with certain woods, just about any stain or finish applied will cause the grain to rise and prickle. I consider it a matter of standard process to dampen and knock the prickle off after sanding through the grits.


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PostPosted: 05 Jan 2017, 17:40 
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DanH454 wrote:
I have found with certain woods, just about any stain or finish applied will cause the grain to rise and prickle. I consider it a matter of standard process to dampen and knock the prickle off after sanding through the grits.


I think for the few extra processes it is worth the extra time.

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PostPosted: 06 Jan 2017, 12:44 
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In a recent article in stereophile they are reviewing a 300B Woo headphone and speaker amp. They draw a similarity between the 300B and 6L6 with relation to audio tube quality. Where the 300B is a respected audio tube, the reveiwer, also felt the 6L6 was in the same class. He did refer to the 6L6 being used in a PP amp and not SE.

In the past I have only had a brief listen to a 6L6 amp (a PP one of my own) and was not really impressed with what I heard. I'm building this 6L6 amp because I wanted to use metal tubes I have and some expensive Psvane 12AT7s. The stereophile comment now has me excited that what I'm about to build may bring a nice surprise.

I have other 6L6s which will allow me to roll a few. Time to push ahead with the amp.

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PostPosted: 08 Jan 2017, 17:37 
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Location: Northern Michigan
M. Gregg wrote:
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

Image

I have used Bar Top my EL84 amp. :up:
Here it is on the test bench.


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PostPosted: 08 Jan 2017, 21:11 
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I guess this answers the $64 Million dollar question, can I drill this wood. Not the prettiest amp I've built but a novelty.

I decided to use the lighter coloured box because I'm going to make matching speakers from the same boxes. I have a pair of 95db efficient wide range 5" twin cone drivers which will go in similar boxes. I'll stand the speakers up beside the amp.

These drivers I can purchase locally. There is also a pair of wide range 91db efficient drivers but would require tweeters. Much better bass though. Maybe next time.
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Projects:”Calibre 834” - tube phono MM preamp | ”najah” - Raw 180W Tripath Class D power amp | "Icon" - Shuguang CV-181Z preamp | "Njira" - 180W Tripath Class D power amp


Last edited by mwhouston on 08 Jan 2017, 23:34, edited 2 times in total.

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PostPosted: 08 Jan 2017, 21:44 
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mwhouston wrote:
Not the prettiest amp I've built but a novelty.


Hrm, inspirational!

I feel a project coming on.... :smoking:

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PostPosted: 08 Jan 2017, 23:31 
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Gregg. I nearly fell over, my wife liked it!

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