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Post by zpilot on May 1, 2019 6:21:07 GMT -7
Check out this video about tube manufacturing. You can see why Mullard tubes are so desirable. I wonder how many current tubes are made with this care. Also see the test for microphonics at 23:39. Simple but effective.
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Post by perryr on May 1, 2019 20:59:46 GMT -7
Very cool, thanks for sharing! I can attest that the hand made structure inside is rigid, much more solid than I would have expected. I dropped a 60’s Mullard 12ax7 on concrete and it fractured. I broke away the glass down to the base and that baby is welded together.
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Post by Andy 67 on Jul 27, 2019 1:50:57 GMT -7
Thanks for sharing, what an interesting view!
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Post by helmi on Jul 28, 2019 8:30:15 GMT -7
Great video. but can you imagine sitting there like those woman doing that for 8 hrs a day? that would make me insane!
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Post by premiumplus (Dave) on Jul 28, 2019 18:37:20 GMT -7
Great video. but can you imagine sitting there like those woman doing that for 8 hrs a day? that would make me insane! That really would numb the brain, huh?
When I was 18 I worked for K&B Mfg. out in Downey, Calif. which was a company that made model airplane engines. I was the engine repairman, people would stuff an airplane into concrete and ram the crankshaft through the backplate or shear off a cylinder head or whatever...and I'd rebuild them and send 'em back. That was boring enough but at least I got to see different problems; it wasn't the same process over and over and over!
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Post by purpletele on Jul 28, 2019 20:05:12 GMT -7
Great video. but can you imagine sitting there like those woman doing that for 8 hrs a day? that would make me insane! That really would numb the brain, huh?
When I was 18 I worked for K&B Mfg. out in Downey, Calif. which was a company that made model airplane engines. I was the engine repairman, people would stuff an airplane into concrete and ram the crankshaft through the backplate or shear off a cylinder head or whatever...and I'd rebuild them and send 'em back. That was boring enough but at least I got to see different problems; it wasn't the same process over and over and over!
Were those engines like the Cox ?
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Post by premiumplus (Dave) on Jul 29, 2019 5:38:50 GMT -7
That really would numb the brain, huh?
When I was 18 I worked for K&B Mfg. out in Downey, Calif. which was a company that made model airplane engines. I was the engine repairman, people would stuff an airplane into concrete and ram the crankshaft through the backplate or shear off a cylinder head or whatever...and I'd rebuild them and send 'em back. That was boring enough but at least I got to see different problems; it wasn't the same process over and over and over!
Were those engines like the Cox ? Similar, but bigger. They were all glow plug engines and all ran on fuel of alcohol, nitro methane, and castor oil. Cox made engines of .049, .010 and .020 displacement. K&B made .19, .29, .35, .40 and .61 cubic inch displacement if I remember right. Like this one:
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Post by zpilot on Aug 6, 2019 7:42:08 GMT -7
You probably rebuilt a couple of mine it seems. I finally figured out I was not very good at RC. Fortunately I am somewhat better at full scale.
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Post by Rockerfeller on Aug 6, 2019 9:25:45 GMT -7
They bought up a bunch of the old Mullard and Brimar equipment and are restoring it to begin making the same quality tubes. Who knows if they can do it, but it was cool to check them out!
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Post by premiumplus (Dave) on Aug 6, 2019 11:17:37 GMT -7
You probably rebuilt a couple of mine it seems. I finally figured out I was not very good at RC. Fortunately I am somewhat better at full scale. I rebuilt a ton...nowadays I fly bigger ones. The yellow one on the left is mine, it has a 55cc converted chainsaw engine for power. They're so aerobatic that you can hover them like a helicopter if you're a good enough pilot. The guy on my right can drag his tail on the runway and hover, then give it full throttle and fly straight up. My plane will do it, but I'm a little nervous to do it that low to the ground!
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Post by purpletele on Aug 6, 2019 11:40:53 GMT -7
That looks fun!
I want to try that!!
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Post by purpletele on Aug 6, 2019 11:43:21 GMT -7
They bought up a bunch of the old Mullard and Brimar equipment and are restoring it to begin making the same quality tubes. Who knows if they can do it, but it was cool to check them out!
That is really interesting, I hope they pull it off, because I'm not buying a Kemper anytime soon.
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Post by jeffmp on Aug 27, 2019 19:29:58 GMT -7
I flew RC for about 5 or 6 years. Really enjoyed it. My last one was a 40 size Super Sportster with a .61 k&B 4 stroke. Loved that plane! I found flying was great but to me building,and then flying what i built was complete satisfaction! Those are some nice looking planes! just the right size too!
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