• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

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wasabii

Member
2021-11-30 10:48 pm
Nice work. It looks like fine jewlery ^.

Heres the stainless (I better get back to working). The sheet is comparable to surgical grade. The good stuff is also non magnetic. I always thought Stainless gives audio the perfect amount of the right touch.

I'll continue buffing in a shiny brush finish and leave lettering out this time. Too much can sometimes be too much and take away from your project instead of add to it. I prefer subtle detail you have to look for instead of having it pop out at you. I'm a less is more kind of guy.
 

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wasabii

Member
2021-11-30 10:48 pm
Is that case oak?.... its a beauty of a case. Oak takes Danish oil like no other, very well though always sampling is the safest bet. I did this desk with it, step 1 shade, I dont remember exact colour it might of been "honey". It has a very subtle shine, the paste wax adds more. Simply an idea, I was not sure if its finished.
 

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wasabii

Member
2021-11-30 10:48 pm
Stainless is great! But so hard to drill into (for me and my tools)


Just go slow and its great to work I enjoy it, and it looks the best. I use new titanium drill bits to drill the holes, after I punch a dimple in it. Otherwise even sharp bits dance everywhere. It takes 7 or 8 light passes to avoid over heating it then it turns blue. I can cut nice true lines in it with an angle grinder. The bluing only looks cool on car headers (not always).
 

wasabii

Member
2021-11-30 10:48 pm
I thought I was under the amp I referred to m(sorry for that confusion).

It doesn't appear to have a finish yet.

workmanship and colour choices are excellent.

It looks more like bamboo however ;)
 

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wasabii

Member
2021-11-30 10:48 pm
I thought I was under the amp I referred to m(sorry for that confusion).

It doesn't appear to have a finish yet.

workmanship and colour choices are excellent.

It looks more like bamboo however ;)

Yea, I had been looking through pages full of different finishes. I accidentally confused something.

Your amp case does look like bamboo. But not so much on the inner sides. I take back my guess lol.

However bamboo is an excellent substitute for many applications for its strength and clean esthetics . It holds up to traffic well. I don't have much experience finishing bamboo and would test first. Or "hearing bamboo" for that matter.

It looks nice as is. But like most wood and synthetic wood its subject to airborne dust that gets trapped in the surface and looks old after a while. If using something more permanent some kind of clear.

Or a wax. Just mask the other parts off.

I started using this, I might make it a habit https://www.canadiantire.ca/en/pdp/...1LhjwsJkBoCyhwQAvD_BwE&gclsrc=aw.ds#store=152


The oil is useful but needs to be reapplied every few months https://www.canadiantire.ca/en/pdp/...-6n8jXhXxoCjPIQAvD_BwE&gclsrc=aw.ds#store=152
 
Last edited:

L0rdGwyn

Member
Paid Member
2019-12-14 6:20 pm
Cleveland, Ohio
Here is a very over-the-top headphone OTL amplifier using 6J5 inputs, 6336 / 6528 outputs.

It's a dual mono design with separate power transformers and HV regulators for each channel, stages are direct coupled, active loading of both 6J5 and 6336 / 6528 cathode follower outputs, 275mA bias of the power tubes for each channel with the sections paralleled, 600uF film output caps. I use a 40-second time delay circuit to allow cathodes to fully warm before B+ is applied, 50V DC elevation of the heater supply, also included a 5V 3-pin fan header on the power supply board, there are two 92mm Noctua fans directly below the power tubes to provide some active cooling. Output impedance with 6528 is 15ohm, 1mW into 300ohm dummy load results in 0.007% THD.

I use it with my ZMF headphones! 300ohm dynamics, pictured is the Vérité Closed.

PXL_20220325_234912726.NIGHT.jpg PXL_20220325_234614840.NIGHT-3.jpg DSCF6835-3.jpg
 
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