Weird looking amp! What output transformers are used for the single-end 6V6 tubes? 

Interesting looking. Not sure if it’s a good looking interpretation of steam punk but kudos for going out on a limb. I’d appreciate it more if the astethics were based more on function than mere add ons to look the part. Dual amp is a good idea. Tubes look vulnerable and a bit unsafe. Chinese boards are a bit meh unless you’re thinking of low prices. With your skill maybe aim higher. More profit selling to the well-heeled.

I like it.  More old 60s dragster look than "steampunk" in my opinion.  I would bet Big Daddy Roth would be playing The Ventures cranked to 11 if given the chance.

Great craftsmanship and a well thought out design.

Love the 'magic eye', personally... *S*  It adds 'tech' to its' Spunk cred, which I've enjoyed some of the wildness that genre generates...

And if one desires a pilot light, it fills the bill and more. ;)

Not familiar with jarrah wood, but looks similar to mahoganey in my eyes.  I'd make the base a tad more 'agressive', but that's just my tastes showing...

"If you build them, will they come?"

Good question.... I've the same thoughts about my diys',  but know that speakers are subject to similiar critiques on technical issues AND the all-important WAFs when and when applicable.

And then....the cost.

Pricing anything so not to give it away v. making rent v. buying that M/Benz you fancy....

That, in itself, can make you crazy if not already.  'We' (Yours unruly, spouse, and staff) make play structures for kids that their parents pay for from concept to installation.

We're not cheap, but still experience the occasional project that can't manage 'breaking even' due to weather, unseen issues in the soil (like major boulders, roots, mud....I can rant more, but won't...), and the occasional employ that doesn't read drawings and/or HAD a 'better idea' that wasn't....

Just a dip in the reality pool...;)

Meanwhile.....enjoy your baby the way I do mine, 👍😃

Btw, 'that employee' doesn't work here anymore.

Present crewe does, and is doing much better without.... ;)

I think the design is really slick.  The tubes on top with the copper tubing remind me of an engine on a Funny Car -- cool concept.  I'd like to see more tubes on each side to really pull off an engine look.  Congratulations. 

Good times! 

Great solution to your set up.

Question.

How did you deal with the switching between the two? Asking, because tube amps don’t like not seeing a load on the output. Can both the amps be on at the same time, or can only one be powered up at a time?

Awesome! Even more so that you made it. 

Very cool!

Looks great! 

electrofelis,

As a manufacturer I am very awaree of how difficult it is to go from concept to product. To do what you did is an accomplishment. 

“He who works with his hands is a laborer.
He who works with his hands and his head is a craftsman.
He who works with his hands and his head and his heart is an artist.”

I like it!  I think it would have some appeal to folk with limited space.. . . And then the question will be economics. With the labor involved, the price would have to be up there. OTOH, it’s a display piece - art. I would pay for that rather than have a plastic boom box occupying shelf space.

I really like the design. I think you should mount a vu meter on some pipe to accent the steam punk design!

Congratulations on building the amplifier and it does look great. Having looked at the STA 540's datasheet, I think you might want to consider a higher quality solid state section if you were looking at marketing the amplifier for hi fi purposes. [That's assuming I'm looking at the correct component - a single chip amplifier selling for about $6.]

In terms of commercialisation, it's worth totalling the cost of all of the components, the cost of your labour and the cost of having the amplifier certified for safety and electromagnetic conformance purposes. You can then add distribution cost, warranty costs, your profit  margin and sales tax to that to get a retail price. That done you can research how it stacks up against potential competitor products to assess if it is a viable commercial proposition.

Congratulations, that's quite an achievement! I love it and the magic eye is brilliant.

Dr. Zarkov has found his amplifier!

I think it’s cool looking.  Reminds me of a dragster engine and the eye is reminiscent of early tuners.   Nice job

I used these output transformers: 

Very, very cool. How much power? Headphone amp?