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Showing content with the highest reputation on 12/25/2021 in Posts
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Thanks everyone. Gifts (new Marin bike for Esmé) and holiday music at home and now jumping on the road to go to Mel’s parents. Birthday cake, apple pie, cheesecake, and who knows what else awaits (besides sugar crash). Hope anyone is having a wonderful Xmas.3 points
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I pulled a few decent shots with the Flair Pro2 and used the Bellman to make cappuccinos. A quick blast of full steam into the milk makes a perfect dry foam on top of the textured milk. This shot was actually pulled on a standard Flair brewhead, not the Pro, but still turned out pretty. 15.5 in 32 out in about 45 seconds, peaking at 6 bar.2 points
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Cases and heatsinks are a problem for DIY builds. Front panels of thick alloy need machining and tapping as do heatsinks. These items are hard to get machined or the sizes the builder wants are not available. I devised a way of making cases, which eliminated these problems and made for easier case design, lower costs and quicker builds. Cases Made from sheet aluminium alloy of preferably 3mm so only single sheet of material needed. I get the parts laser cut by a company which will also supply the material. The case parts need holes to be countersunk where necessary and are then taken for surface finishing, (bead blasting and anodising in my case). I then take the front panels to be screen printed with the graphics I provide. The assembly is with corner posts and angle brackets cut and drilled, and bolted together. I only drill and tap corner posts to attach base and top panels. The case is basically a box with a front panel on to cover the front of the box. Heatsinks https://uk.farnell.com/amec-thermasol/fch505010t/heat-sink-50mmx50mmx10-25mm-ceramic/dp/2499023 Edit; a link to these was omitted, http://www.amecuk.co.uk/ Element14 has them in many countries. https://www.newark.com/c/cooling-thermal-management/heat-sinks?brand=amec-thermasol I discovered porous ceramic heatsinks and realised that these small, light, self-adhesive items would solve problems. I bought a few and tested to see if they did what was claimed. A single 50mm square of 10mm thick could dissipate 5-10W stuck on sheet aluminium. To make heatsinks you only have to bolt the semiconductors directly to the 3mm plates and place the ceramic heatsinks as needed. They are not expensive, and with a range of sizes you can arrange heatsinks of different shapes. I was concerned that they might unstick but the opposite has been true, they are hard to remove. They are not pretty so I contain them inside the case and organise slots above and below to act as a chimney to allow convection. This works well and they do not run hot. The porous ceramic devices are very effective. I have found that this method is much easier to procure and build. The amplifiers built this way can be smaller and lighter.1 point
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Hey sacd_lover here. Have not been on the board in years. See lots of names I know .... tkam, kevin gilmore, mexican dragon, blessingx, Dusty Chalk etc... Hope everybody has been well. Just picked the latest thread to reintroduce myself.1 point
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Thanks everyone. I had a nice day and nice evening with my birds and cat. Hope you all are doing well.1 point
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Oooh, didn't know about Tracey Thorn's album, will definitely listen! Not the most capable voice, but SO emotive, I love it/her. BTW, one of my favorite EBTG tracks is "Come On Home" which also has a slight Xmas theme or reference to it.1 point
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NO, the incident with the T2 was a real original T2. The fake siemens tube made on RFT equipment arcs over when you use it in the cascode position. Then it shorts out the gain tube and puts 200 volts on just about everything in the front end including the volume pot. Lots of damage. I've never tested with lower voltage rated parts. probably they will eventually blow up as the 2sk216 definitely sees about 200 volts on it.1 point
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DO NOT ROLL TUBES on a T2. Definitely do not roll fake siemens tubes as they cause the amp to blow up many expensive parts.1 point
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As you know, There are a bit higher chances to find obsolete Japanese semiconductors in Japanese auction than eBay. However it's true that still some (or many) of them are fakes, probably not as bad as eBay though. I obtained reliable name list as below. Their price isn't cheap, but you get guaranteed genuine parts. masayanmori kusto30145 wyxnb12593 Actually they belong to the company Tohri Electronics trade inc. and they use those Yahoo! auction accounts for private customers since Tohri's business is mainly B2B. Tohri is known to have good stock of 2SJ79 and many other rare parts. They can make combined shipping when you buy from those accounts in the same time, the sales contact person of Tohri said. BTW I failed to get quote for large volume of J79 as they want to keep serving their limited stock to the customers who needs for long time. I like that answer.1 point
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