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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 10th January 2018, 01:43 AM   #61
Tubelab_com is offline Tubelab_com  United States
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I'm reorganizing the mess to make space for building 4 more boards, with pictures and maybe video when I find a box with a few metal tubes in it. I remembered that someone gave me a couple boxes of loose tubes at the Dayton hamfest 2 years ago, I took out the stuff I wanted, then gave away the rest, but these few metal tubes got forgotten until today. I had already pulled the pair of metal 6L6's and put them with the other 6L6 types, but haven't tried them. There were some tubes that were taller than the others. I picked one up and it was a 6AG7 which is a pentode, useful as a driver, but I didn't look much further.

Today I looked. Out of the 10 tall tubes, 8 were metal 6V6's, all were shiny black with no rust......what do I do with these???????

Stick them in the amp, and twist some knobs.....what do you get from some old metal 6V6's? How about 30 watts at clip, 25 watts at 1.1% distortion. The problem with the metal tubes is that you can't tell if they are melting inside, but there is an easy test.....pop some glass tubes into the sockets and watch them.

I want to play these guys on speakers tomorrow, and dig up some glass 6V6GT's to find out what's going on behind that steel curtain.
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Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......

Last edited by Tubelab_com; 10th January 2018 at 02:54 AM.
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Old 12th January 2018, 08:02 PM   #62
Tubelab_com is offline Tubelab_com  United States
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I did get to stick some glass 6V6GT's in the amp and test them at 30 watts. Nothing was glowing once I found 4 good tubes. Plate dissipation at 30 watts output is 15 watts per tube, a bit beyond the 12 watts spec, but in normal operation you are only going to hit this on loud peaks. I hooked up the speakers and let it play some streaming music from my iPAD for most of Wednesday. No issues, and it did sound nice.

The mail girl brought me my Mouser order yesterday, so I cleared the workbench and set up the cameras. I was planning to spend today stuffing boards, but stink happened.

With about 3 inches of packed snow on the ground, the rain started yesterday.....and hasn't stopped yet. It will rain until late tonight when the rain turns to mush and then snow. 5 to 8 inches, 10 in isolated areas are expected by mid day tomorrow.



This morning I looked outside to see that the previously frozen creek had thawed and overflowed its banks. Water had risen about halfway up the back yard, and the pressure started pushing the water in the saturated ground toward the house. My lab, workroom, and music studio are in the basement which is well below the level of the water.

The neighbor told me that she has standing water in her basement, so I spent the morning dragging expensive electronics the cameras and a lot of other stuff upstairs. The workbench in now piled full of things I didn't want wet.

So far there has been no water intrusion, but the creek is still rising. Flooding has pushed some of the septic tank drain field water into the sump system, stinking up the entire house.

We will have 2 to 4 days of cold and wet before I can get things back to normal. I may set the soldering iron up on a folding table and stuff two boards just so I have 4 to play with. That depends on how today (flood warnings until tomorrow) and tomorrow (maybe snow shovel / blower day) goes.

The first two pictures were taken this morning. The 3rd a couple of days ago.
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Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......

Last edited by Tubelab_com; 12th January 2018 at 08:04 PM.
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Old 12th January 2018, 08:34 PM   #63
w5jag is offline w5jag  United States
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We have a basement at our primary house, which is rare, because hydrology here is unfavorable to basements.

There is a product, I call it hydraulic cement, that you can use to plug water entry points. You can put this stuff into a hole or seam even when water is actively flowing through it under pressure, and it will set and block the flow. A bigger hole will take more cement and more time, you just work at it a little bit at a time. I've also used this product in commercial buildings with great success on subterranean water. I had a floor, probably six feet below ground, where a new slab was up against a 150 ish year old sandstone field rock wall, and water was pushing through the seam. Stopped it. It works really well. There is a name for it, but hydraulic cement will be enough for the supply house to know what you want. It takes a lot. Get three times what you think you'll need if you try it.

There is also a paint like product that you can brush on that will seal cement blocks to water intrusion. It won't fix holes, you need the cement for that, but normal porosity, it will handle.

For good measure, I put in two sump pumps in the slab to pull water away from the basement area. This only helps if you have someplace else you can pump the water to.

We were getting three and four feet of water in our basement, now it's dry.

Win W5JAG

Last edited by w5jag; 12th January 2018 at 08:42 PM.
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Old 13th January 2018, 04:56 AM   #64
zman01 is offline zman01  Bangladesh
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Hi George,

Sorry to hear about the hardship brought upon by the weather. Hope things improve quickly.
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Old 13th January 2018, 01:00 PM   #65
colnago55 is offline colnago55  United States
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Looks like you are in a beautiful location. Good luck with the water. Stay dry.
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Old 13th January 2018, 01:33 PM   #66
Tubelab_com is offline Tubelab_com  United States
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So far there has been no water in the basement. The landscape looks a bit different today. That truck rim is 10 inches wide.
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Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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Old 17th January 2018, 10:55 PM   #67
pelayostyle is offline pelayostyle  United States
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Just finished catching up on the thread. Very exciting stuff going on in your lab! Looks like the weather is getting a little crazy. Take good care George.
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Old 18th January 2018, 03:17 AM   #68
Tubelab_com is offline Tubelab_com  United States
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UPDATE:

It has been snowing nearly every day since I took the pictures in post #66. So far there have been no incidents other than a daily workout with a snow blower, shovel, broom, or all 3.

There were predictions for sub zero weather with no snow today so school was cancelled again. I haven't seen a school bus in a week. Instead we had temperatures that hung around +10 degrees F all day with periods of sunshine and snow showers. More of the same expected tomorrow.

There is currently about 7 inches of snow on the ground. The creek out back merges with another creek and both empty into the Ohio River which is about a foot below flood stage. Sooner or later all the snow is going to melt and the water has to go somewhere. The area where the two creeks merge experienced severe flooding last week and has been evacuated. Temperatures are expected to remain below freezing until next week.

I had set up the cameras to take pictures and video of 4 new boards being assembled. That didn't happen and all the camera equipment and a lot of other stuff is upstairs, and will remain there until the flood threat is over.

I removed the two boards from the test amp. They are being updated to match the latest parts list. Two new boards are being populated to match. After all 4 boards are tested and working, the parts list and schematic will be updated, and posted. The old boards will be returned to the test amp, and the new ones will be used to make a complete amp.
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Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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Old 18th January 2018, 08:19 AM   #69
rmyauck is offline rmyauck  Canada
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Nice new boards George! Maybe in a few years I can afford to buy some more parts & your PCB's. I posted a link to this site over at AK when you announced the new boards, and hopefully that will help you sell more!

Your winter pics look like around here (since the middle of Nov.)

We just get cold 500 miles north/central of the US boarder at this time of the year with temps lately hitting -37C /-35 F overnight. Last few days have warmed up to the temps your mentioning during the day which is about -10 C I believe. Back to -20 C or colder next week or -5 to -10 F! 26 inches of snow so far which the snowmobilers like. Ice has been thick enough on the surrounding lakes for ice fishing since fairly early in Dec.

Last edited by rmyauck; 18th January 2018 at 08:31 AM.
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Old 18th January 2018, 12:40 PM   #70
gideon1990 is offline gideon1990  Netherlands
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Would you recommend this as a first big project?

I have done lots of low voltage projects and I am building my first tube headphone amp right now. But I would like to make a real amplifier for the living room after this, most likely a PP KT88 behemoth.
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