I heard someone used a sugar cube once. Abrasive, but not too hard.
Try it somewhere where it is not noticable first.
If it works, try to go with the grain. It seems to run horizontal.
Worse that can happen is you have extra sugar for your coffee! 🙂
Worse that can happen is you have extra sugar for your coffee! 🙂
Pass DIY Addict
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I would try some liquid solvents before messing with a solid abrasive to remove that old logo. Nail polish remover? Paint thinner?
If that doesn't work, you'll probably need to re-brush the entire front surface. You can do some nice work with a sanding block and 400-600 grit sand paper. Use a block of wood as an edge guide so you get nice straight lines when you sand.
If that doesn't work, you'll probably need to re-brush the entire front surface. You can do some nice work with a sanding block and 400-600 grit sand paper. Use a block of wood as an edge guide so you get nice straight lines when you sand.
Re-brushing it would remove the golden anodized layer and the natural(silver) color will appear.
To remove silkscreen take a coin, cover with a bit of paper towel, and use Acetone. Rub against the silk and it will come off fairly easily.
The paper towel is used to keep all the Acetone from evaporating away in seconds.
The paper towel is used to keep all the Acetone from evaporating away in seconds.
I guess I should have quoted who I was talking to. That looks like a slab of granite, on a couple metal rails.
Myself, I would leave the Krell Logo. But if you want to remove it try Acetone first. If that doesn't work try Xylene. Be careful it's highly flammable. And use it outside so you don't get high.
Liquid cooling the F5 Turbo
All,
I've read recent postings about liquid cooling of Pass DIY amps.
My next door neighbors--Wilbur and Orville Wong--recently developed a liquid helium (H3) cryostat cooling system for the F5 Turbo V3. It works at 0.365 degrees Kelvin--and thanks to superconductivity, is 132.78% efficient. Working in their garage workshop (picture shown) they developed the cooling system for $3.23 (US) using parts from a Maytag washing machine, Yugo station wagon, and a Mercury outboard motor.
The picture shows the obvious jubilation of Wilbur and Orville, right after they measured the Turbo V3's output at 3.446 KW into 0.2 ohms. Wilbur found no problem in holding Orville's hand to the heatsink for more than a minute--although Orville subsequently lost several layers of skin and suffered severe hypothermia in attempting to remove his hand afterwards.
Ohhhh..... There is something so wright about their concept, and yet something so wong in their execution.
Enjoy....... Pass DIY and Class A forever.....! 😀
All,
I've read recent postings about liquid cooling of Pass DIY amps.
My next door neighbors--Wilbur and Orville Wong--recently developed a liquid helium (H3) cryostat cooling system for the F5 Turbo V3. It works at 0.365 degrees Kelvin--and thanks to superconductivity, is 132.78% efficient. Working in their garage workshop (picture shown) they developed the cooling system for $3.23 (US) using parts from a Maytag washing machine, Yugo station wagon, and a Mercury outboard motor.
The picture shows the obvious jubilation of Wilbur and Orville, right after they measured the Turbo V3's output at 3.446 KW into 0.2 ohms. Wilbur found no problem in holding Orville's hand to the heatsink for more than a minute--although Orville subsequently lost several layers of skin and suffered severe hypothermia in attempting to remove his hand afterwards.
Ohhhh..... There is something so wright about their concept, and yet something so wong in their execution.
Enjoy....... Pass DIY and Class A forever.....! 😀
Attachments
That is fantastic!
Can you elaborate on how they cooled the voice coil of the speaker to handle a couple KW? Full immersion in liquid? I can't imagine that would be all that good for the sound quality...
Can you elaborate on how they cooled the voice coil of the speaker to handle a couple KW? Full immersion in liquid? I can't imagine that would be all that good for the sound quality...
6L6, Don't pay any attention to Mr. Car-Man. Word is he got bit by one of those Florida snakes and it has effected his sensibilities.
I think he is taking a jab at me, but he best spend his time completing those electrostatics he promised.
I think he is taking a jab at me, but he best spend his time completing those electrostatics he promised.
I'm not too worried, he's inhaled too many JP-7 fumes in his day... He's been gone for a long time as far as I can tell... 🙂 🙂 🙂 🙂 🙂
Yep. The voice coils did handle the cryo-turbo F5 V3 power! Of course, that was only for a few milliseconds, but the HF output was VERY impressive!
6L6.... I'll get in contact with you in a few days. I'm currently overseeing/helping/hindering a bunch of subcontractors putting a pool in the back yard. Funny, but 86 degrees and 98% humidity feels a LOT different than 86 degrees at 5,200 feet in Colorado...... This "retirement thing" certainly isn't as relaxing and liesurely as I thought it would be....!
Actually, the idea of a liquid (non-cryo, of course) amp is intriguing--I'll have to add that to my "to do" list....somewhere....sometime....somehow.....
🙂
Stay Tuned - The BA-3 with four output boards should be ready to show around mid-week. 😉