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Old 29th May 2011, 01:04 PM   #51
w5jag is offline w5jag  United States
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Ron, both sse pages are working - I just looked at them.

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Old 29th May 2011, 04:41 PM   #52
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I wanted to work up a parts & cost list, but the web page's link to that is broken for the Simple, as is the OPT page.
A legal issue requires Tubelab to cease use of the word "simple" paired with the common abbreviation for single ended. All use of the combined words had to be removed from my web site rather hastilly. Many web pages were renamed. The amplifier, circuit board and all things associated with it are now known as "SSE". If you negotiate the web site starting from the home page, all links should work. Links stored in your favorites will not. I am working on a revised web site, but I have not had much time lately.

Quote:
So, how was Hamvention? I didn't get to go.
It rained for 3 weeks leading up to the hamfest. The TV weather man promised good weather for the hamfest, followed by more rain. I drove to Dayton Thursday afternoon in the rain. It was still raining at 11 PM. Friday morning...clear blue sky and 60 degrees. They got it right. Attendance seemed a bit thin on Friday morning, probably due to the previous rain. Saturday was quite crowded until IT happened.

I had already planned to leave mid afternoon to start the long drive home. I noticed water flowing out of a crack in the poorly paved parking lot where the swap area is held. Something also smelled bad. Within a few minutes the water flow had become a volcano of raw sewage. I said goodbye to my friends and hit the road.

On Friday I was buying sweep tubes NIB for $1 each. I collected about 100. On Saturday I raised my limit to $2 and collected a few more. I got some RF parts, 8 antennas, some chassis, and a 5KW RF amplifier.
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Old 14th June 2011, 03:49 AM   #53
w5jag is offline w5jag  United States
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Doh, now that Summer has set in I was changing out the 6146B's for lower dissipation 2E26's and pulled a plate cap right off one of the Chinese 6146's.

Went to Ham Com this weekend and only came home with seven tubes, a globe 80, a couple of globe 46's, a globe 47, a couple of 5842's, and a 12AX7. I looked for some 801's ( not 801A's ), but couldn't find any. Saw 45's, including some globes, saw some 2A3's, 6A3's (which I meant to get, but forgot) 813's, and even some GE 6550's and 6CA7's and more, but I passed on all these.

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Old 15th June 2011, 02:38 AM   #54
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I brought back over 100 tubes from Dayton most big sweep tubes for $1. They are still sitting in the box in the middle of the living room floor wher they landed when I unpacked the car. Too much time spent at work now.

I typed two words in a thread in the main tubes forum. Those two words started something that people have been asking for for years.

Many people think of me as a guitar player and I used to be a good one. I learned tubes by making guitar amps out of old TV sets when I was quite young (like about 10). I made guitar ampd for friends and for sale on and off over the years. I haven't made a completed working guitar amp in about 15 years though and I don't even have a working amp right now. My Stratocaster is in pieces, and my fingers are too stiff to play well. But I had to open my mouth....So there is a contest running right now. Deadline for completion is Aug 15.

http://www.diyaudio.com/forums/tubes...challenge.html

I guess for the next two months I will be designing a master screamer or 2 or 3.
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Old 15th June 2011, 08:17 AM   #55
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George, thanks for the link. I wasn't aware of this contest. I love this and I may very well build something from the entries, since my only amp is a SS modeling amp (which I actually like a lot). I'd probably mate it to a diy single 15" cab, since I love the sound of a 115 even at low volumes.

I do think the rules will have to somehow involve speakers and recording technique since apparently they will be judged according to recorded sound, but it will certainly be fun to watch.

Now we know your button - a good competitive challenge, hi.
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Old 15th June 2011, 09:56 PM   #56
w5jag is offline w5jag  United States
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Too much time spent at work now.
I haven't had any building time for awhile now - I'm way behind. 6146 SSE #2 is mostly worked out in my head, but I need to build it up and validate it and move it to a chassis.

I took my Tubelab SE apart for a rebuild about nine months ago and haven't touched it since. I'm thinking of moving it to the chassis 6146 SSE #1 is on, but that won't happen until #2 gets built and vaildated.

I ordered one of the DZ Kit transceivers last summer and the last of the modules made it in a couple of weeks before Hamvention, so I would like to start on that kit sometime.

I'm still working on the hybrid transceiver that got me started on the tube audio diversion. There is just never enough time, it seems.

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Quote:
.... and a 5KW RF amplifier.
LOL, I don't know why this just now sunk in. 5KW? There's got to be a story here.

Last edited by w5jag; 15th June 2011 at 10:09 PM.
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Old 15th June 2011, 10:42 PM   #57
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LOL, I don't know why this just now sunk in. 5KW?
Yes, 5KW AND I carried it from the back of the swap meet to my car across the street from the hamfest, about 1/2 mile.

There are some guys that are there every year. They have a wide variety of stuff on their swap tables from tubes (too expensive) to RF amplifier modules that have been salvaged from MRI equipment. They are priced by the number of MRF150 RF mosfets on the module. Usually about $10 per fet. I got some of these from them 2 years ago when a major rain storm was approaching and I offered a low ball price. As the rain started they took my offer. The amps seem to cover 40 meters (7 MHz) to 10 meters (28 MHz) and put out about 100 to 150 watts per fet. I have been tinkering with some of the small ones (4 fets) that I got 2 years ago and have indeed seen 500 watts flow on 20 meters. I bought a big one back then that had 24 fets and said 2.5 KW on it. I have not even tried to fire it up yet.

So this year they had this monster 5KW amp. The guy said it goes from 20 to 70 MHz and needs 48 volts at 150 amps. I don't know why, but when he said $75 I got out my wallet. The heat sink is worth that much, but I wasn't so sure about half way to the car.

No way I can light this whole thing up, but I will test the driver by itself. It should be good for about 600 watts on 6 meters. The heat sink in this thing is big, but can not support CW at 5KW. It is from an MRI machine where short pulses are the norm.
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Old 23rd June 2011, 06:19 PM   #58
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Originally Posted by tubelab.com View Post
The heat sink in this thing is big, but can not support CW at 5KW.
-. .. -.-. .

--... ...--

.-.-.-
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Old 18th July 2011, 04:53 PM   #59
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Well, the sudden arrival of a toddler in the house has brought 6146/2E26 SSE use to a screeching halt - plate caps are too much of an attraction and danger and there are no non plate cap tubes in this base configuration that I am aware of.

So, in keeping with the oddball tube use, a hasty reconfig yesterday afternoon has brought 6AR6/6098/6384 to the SSE party. When it's safe to use plate caps, 6889, 6BQ6 and 6DQ6 can also be used. All of these are low screen voltage tubes, that really need to be run as pentodes. For anyone who has not seen a 6AR6/6098, just think of a (real) Tung Sol 5881/6L6WGB - they look identical. 6384 is a ruggedized variant made by Bendix, Tung Sol, and Cetron. 6AR6, 6098, 6384 and 6889 tubes do not drop in the SSE sockets -a pin adapter is required.

Now that I know how to do this, the reconfiguration was pretty fast and simple: I pulled the 180K resistor that was paralleled across the original 220K grid resistor; put the screen voltage back to pin 4, put the OPT lead back to the pin 3 trace on the pcb; and changed the screen supply back to a CLC setup from the LC setup I was using. This gives about 240 volts screen voltage, out of spec for 6BQ6 but they'll just have to learn to live with that, life's tough sometimes, expecially for cheap sweep tubes, it's in spec for the others. If I did anything else, I can't think of it off the top of my head. I left the local negative feedback plate to grid (Schade) in place.

For now, I have a 560 ohm cathode resistor in place. This puts the grid voltage at about -24 volts, and about 400 volts on the plate with a 5Y3 rectifier, or about 19 watts dissipation with 6AR6/6098/6384. I'm using 5K plate load.

So far it sounds reasonably nice - a bit brighter than 6146 (may need to increase the current) and a bit less gain, but it's easy and inoffensive on the ears as is.

I've been giving some thought to 6146 SSE rev II and I'm not sure I'm going to go there at this point - I've been working on a chassis and have it partially cut, but now I'm thinking of working on a child resistant SSE in the immediate future and that may or may not be a 6146 based amp.

Having put many thousands of hours on the 6146 in single ended pentode over the last ten months, and at least a thousand hours or more on 2E26, my personal opinion is that, within their limitations, these are perfectly fine tubes for audio amp use, and the problems one often reads about being associated with these tubes are largely overblown. They are, as RCA originally described them, compact powerhouses. It was a fun run. My only regret is not getting around to giving them a run in triode - an early RCA data sheet allows 400 volts in triode mode.

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Old 7th October 2012, 10:03 PM   #60
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Originally Posted by tubelab.com View Post
I have at least two, maybe three Motorola base station power supplies liberated from the Orange County (Florida) public safety system when they were upgraded. They put out 1500 volts at 1/2 amp, but weigh 75 pounds each. The transformers are of the ferroresonant variety so they make a buzzing noise. Probably too loud for audio, but could power a nice ham radio amp. Free to a good home, just figure out how to move them. I have been trying to give them away for a while now without success, I guess that nobody builds big HF amps anymore. They will probably got to scrap when I get down to the end of the warehouse. Large object with huge transformer on the left:

The 833A SE Amp Prototype



Reality finally reeled me in from the extreme amp building binge I was on several years back. I still have the 813's but I sold the 4-400's and the 4-1000's. I still have several 833A's though, interesting trades?

There are a few 6146's sitting around my lab, I was planning to torture them in a P-P amp, but who knows........
They would make a perfect HT for a Tesla coil. Shame I'm in Australia
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