Kerry Posted January 10, 2011 Report Posted January 10, 2011 kerry came up with this one... a BHSE with the servo's from a T2. http://gilmore.chem.northwestern.edu/BlueHawaii-T2-Servo-v1-2.zip opens with ltspice. I forgot to knock down the voltage going into the opamp servo, but it is the same as on the T2. Model still works, though I'm not sure what would happen in the real world. I just added it to my model. I would love to get feed back on this. It's actually the T2 output and the BH input with servo similar to the vendetta / T2 for the input section.
kevin gilmore Posted January 10, 2011 Report Posted January 10, 2011 titanium screws here UTI-SCREW Inventory-Titanium Screws, Zirconium Screws, C276 Screws, Nickel Alloy Screws tungsten carbide screws are available, and look very cool neither requires any coating of any kind, and don't rust. The servo won't care if its on +/-12 or +/-15.
luvdunhill Posted January 10, 2011 Report Posted January 10, 2011 Ah, I wasn't clear. The "coating" was to add color more than any functional use. Oh, you're probably taking to Justin... Carry on...
Driftwood Posted January 10, 2011 Report Posted January 10, 2011 A beautiful set up there Craig! The knob looks great. What are the tube dampers you are using on the el34?
luvdunhill Posted January 10, 2011 Report Posted January 10, 2011 sure, these are the people I'm using: Welcome to Crosslink Texas, Powder Coating of Austin
Craig Sawyers Posted January 10, 2011 Report Posted January 10, 2011 A beautiful set up there Craig! The knob looks great. What are the tube dampers you are using on the el34? They are Pearl tube coolers. Main aim is to even out and reduce envelope temperature - increases tube life by a factor of two - but they do have a damping effect too. Corrugated and blackened copper held on with high temperature O-rings. Important with four rather expensive Mullard xf4 original EL34's. Got them from Parts Connexion.
livewire Posted January 10, 2011 Report Posted January 10, 2011 @Craig - Beautiful black box(es) you have there. Love the pics. Is that wood knob a custom micro-machined KG original?
swt61 Posted January 10, 2011 Report Posted January 10, 2011 As for masking parts to be powder coated...you can use about any product, as the coating really is powder. I used Blue painters tape, so it wouldn't leave a glue residue. Then my powder coater removed the tape after coating/before the oven. Make sure your powder coater masks threads, as all don't. If not I found the best thing is to re-chase with a tap. You can get smooth or hammered surface textures, as well as gloss or satin, but I'm not aware of a flat powder coating yet. The baking process would make it difficult to produce flat I'd imagine. Smooth surfaces generally are about 2 mil, with textured about twice that. At least in my experience. Clear coating screw heads is an excellent idea. I used to have a lot of pipe powder coated, for deck railings in Alaska. And when building custom computer cases.
Craig Sawyers Posted January 10, 2011 Report Posted January 10, 2011 @Craig - Beautiful black box(es) you have there. Love the pics. Is that wood knob a custom micro-machined KG original? It sure is. I sent KG a chunk of Lignum Vitae, and he did the business. There are some detailed pics he took before shipping it way back in this thread somewhere. A real source of joy - just waxed it to bring out the grain.
Craig Sawyers Posted January 10, 2011 Report Posted January 10, 2011 As for masking parts to be powder coated...you can use about any product, as the coating really is powder The neat thing that I've done in the past in products I've developed (mainly mil stuff) is to have the panel engraved after either powder coating or anodising. The engraving can either be left as it is, or filled with colour - or a range of different colours. Much more robust than silk screening. One of the old timers from Tektronix was telling me the way they developed the lettering for the old tubed 500 series was to have a load of panels done in different ways (engraved and filled, screen printed etc) and stuck them to the floor in Tektronix's entrance hall. Employees were required to walk on them when they passed to pick the most robust. The original choice was engraved and colour filled. They then moved to silk screening once they had a process that also passed the walking test.
Inu Posted January 10, 2011 Report Posted January 10, 2011 I forgot to knock down the voltage going into the opamp servo, but it is the same as on the T2. Model still works, though I'm not sure what would happen in the real world. I just added it to my model. I would love to get feed back on this. It's actually the T2 output and the BH input with servo similar to the vendetta / T2 for the input section. It
Inu Posted January 11, 2011 Report Posted January 11, 2011 Here's a couple of pics with the T2 where it lives in the corner of our bedroom (and that was an interesting conversation, trust me ). I think your next birthday gift from her is a caring case for these.
nattonrice Posted January 11, 2011 Report Posted January 11, 2011 Either that or a hammer and divorce papers with a card that says "Choose"
luvdunhill Posted January 11, 2011 Report Posted January 11, 2011 Either that or a hammer and divorce papers with a card that says "Choose" Aren't you the next participant for the "shock and awe"?
luvdunhill Posted January 11, 2011 Report Posted January 11, 2011 I got the powder coating back. Damn they did a good job. Everything seems to fit too. I brought my T2 heat sinks and they said they will be able to accommodate the narrowish fin distance, so when the time comes I'll have them do my chassis. Pics once I get home.
luvdunhill Posted January 11, 2011 Report Posted January 11, 2011 Pics here: http://www.head-case.org/forums/product-annoucements/8175-prototypers-wanted-22.html#post411415
nattonrice Posted January 12, 2011 Report Posted January 12, 2011 Aren't you the next participant for the "shock and awe"? Yeah if I found time to finish stuffing the amp board... I also need to track down a 5-40 coarse tap. Did you get those r's I sent you?
livewire Posted January 12, 2011 Report Posted January 12, 2011 Pics here: http://www.head-case.org/forums/product-annoucements/8175-prototypers-wanted-22.html#post411415 Nice! Dont see that (color) everyday. Those tube holes are screaming out for some custom machined dress rings.
Craig Sawyers Posted January 12, 2011 Report Posted January 12, 2011 Pics here: And that looks truly spectacular. Looks like the the amp equivalent of a custom car job. MMMM. Inu's powder coated T2 looks great - and his coater managed to get right in to the heatsink fins. I did my KG triode chassis with black crackle finish - which you can get from specialist suppliers of car restoration accessories. Sprays on and looks just like flat black, but as it dries (in the domestic oven - shhh, don't tell - the wife was out...) it crackles.
kevin gilmore Posted January 12, 2011 Report Posted January 12, 2011 The two of you, and you both know who i'm talking about... Knock it off with sticking chassis in ovens where you cook food. Seriously... There are VOC's... Even in the water based stuff.
luvdunhill Posted January 12, 2011 Report Posted January 12, 2011 The only thing I've stuck in ovens are heat sinks to do some testing. It was a rental place though and we left a few weeks after
Kerry Posted January 12, 2011 Report Posted January 12, 2011 Here's some fun stuff. It's my draft for the BHT2E (per Inu ) power supply. It's got +425V, +15V, -15V, -295V (via 160V against the -455V rail), -425V, and -455V (via 30V against the -425V rail). The dimensions are 12" x 5.5". Once, I have this built, I may take a BH board and hack it up a bit to test the design. Any thoughts are greatly appreciated.
Kerry Posted January 12, 2011 Report Posted January 12, 2011 Yes. I was shooting for a specific size on this board.
Inu Posted January 12, 2011 Report Posted January 12, 2011 Yes. I was shooting for a specific size on this board. I see. The holes next of the connecters are for the plastic standoff?
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