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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 15th December 2012, 12:38 AM   #221
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If it can be fastened to same holes, I would rotate it for assurance sake.
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Old 15th December 2012, 07:56 AM   #222
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Originally Posted by Evenharmonics View Post
If it can be fastened to same holes, I would rotate it for assurance sake.
Thanks, I will keep that in mind!
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Old 3rd February 2013, 03:04 PM   #223
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Default New Tubelab SSE

I thought that I'd post a picture of my new SSE that just came to life this weekend. The chassis design was heavily inspired (a.k.a. copied) from Pez's amp in post #42 of this thread. The wood is curly maple and cherry.

P1020339.JPG P1020340.JPG P1020336.JPG

This is my first experience with tube amps, so I was a little worried that it wouldn't really have enough power to drive my 89-90 dB old Polk Audio monitors. Well, with JJ EL34's there is plenty of power in triode mode for my listening levels. UL makes it louder than I need. I'd like to try some KT88's or KT90's...

The transformers are all de-blued Edcors (XPWR002-120 and GSXE's). The wooden board that supports the transformers is removable/replaceable if I decide to upgrade to bigger transformers at some point. I get about 420V B+ with a 5AR4 rectifier tube and this 720V transformer. I couldn't bring myself to spend the extra $20 to get the Edcor 750V transformer. I have the motor run cap and triad choke hidden inside the chassis, as well as a 6-setting cathode resistor circuit with a rotary selector switch on the back. I put a pair of test points on the back to measure cathode voltage/resistance without having to go into the guts of the amp.

Anyway, this amp sounds great and was a ton of fun to build. Worked first time I fired it up. Probably the hardest part was wiring up the CFB switch, which took some thinking and a little experimentation to get the right polarity. In hindsight, I might have made the chassis a little bigger. Cramming everything into a 10x12 box was a bit challenging.
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Old 4th February 2013, 03:54 PM   #224
rknize is offline rknize  United States
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Nice build!
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Old 5th February 2013, 12:03 AM   #225
rock12 is offline rock12  United States
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good looking! I t gives me hope for mine edcors still out a couple of weeks though I started soldering some
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Old 8th February 2013, 10:55 PM   #226
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Default Another Tubelab SE is hatched

Tubelab SE with 45's and a 5U4. Output transformers are electra-print and power transformer is an Edcor XPWR131-120.
Attached Images
File Type: jpg Tubelab 45 front.JPG (690.2 KB, 1142 views)
File Type: jpg Tubelab 45 side.JPG (653.7 KB, 1103 views)
File Type: jpg Tubelab 45 rear.JPG (685.7 KB, 1054 views)
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Old 8th February 2013, 11:56 PM   #227
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As for the orientation...
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Old 9th April 2013, 09:19 PM   #228
ffejgo is offline ffejgo  United States
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Default TSE is Finally Home

Finally have my TSE in it's permanent home. Took me way too long to build the enclosure. Had to get the 2 by 4 and plywood breadboard out of the family room before my wife threw me out. For someone who never did electronic work or even soldered before I am pleasantly surprised at how easy it was to build the TSE. Thank you George for terrific instructions (pictures were invaluable) and everyone here on "diyAudio". Found out if I had a problem to just search the Tubelab Forum and there would be an answer. If I had only knew how to pay closer attention to the difference between 120 ohm and 120k ohm I may not have spent 2 days pulling my out hair trying to figure out why R30 was burning up (I replaced it twice before it clicked). I originally had the amp up and running in the fall but then something went wrong and it stopped working. I picked it back up in January and figured out it was just the rectifier tube, NOS. Then last week, the new 5AR4 I purchased in January failed. I'm currently using my last rectifier tube. In reading the posts here it appears this can be a common problem until you find that magic tube that seems to last forever.

I used 3/4" Brazilian Cherry flooring that I had leftover from our kitchen for the box. I had to paint it so it would closely match the shelf unit it sits on (W.A.F.). I did leave the back unpainted (for me) and if desired I can always remove the paint. I would not recommend this wood to anyone who (Like me) doesn't have the proper tools. This flooring is harder than a rock to work with. I always wanted the 'Record Player' look. The enclosure started as a square box them changed into a 45 degree front, which morphed into 60 degrees. Again, a W.A.F. consideration. Though I do like it better. The turntable platter stands out more. The top plate is 1/2 inch Lexan in a Light Smoke color which sits in a routered grove in the walls. This way my edges don't have to be perfect. The Lexan is more than strong enough to hold the transformers. The amp weighs in at a tad over 40 pounds. Yes, that is a real album sitting on top. I just added it this morning and have not turned on the amp to witness a possible melting process take place. I more than likely will have an 'Album' plate made by Front Panel when I get the extra $125. I used Edcor's XPWR131-120 PT and CXSE25-8-5K OPTs. Edcor finally came out with black bells which look much better in my situation than the blue ones. Socekts and resistors are mounted on top with everything else on the bottom. It wasn't dificult bending the little legs of the voltage regulator. My wiring isn't the greatest. I still have to clean up the wiring mess ( Can't bring myself to cut the wires shorter, since I may change my mind about the arraignment in the case. With all the messy wiring there is (at this time any ways) no hum issues. Except with my ear right up against the speaker I can hear a slight noise.

I cannot say enough about how this amp sounds. I am using Raython 45's (purchased off eBay) and run the TSE through Klipsch Forte II's. I feel as though I'm sitting center stage at every venue. Friends who listen to the TSE are amazed that an amplifer that generates less-than 2 watts can produce such claity and volume. I have used the pre-outs on my Pioneer VSX-1121K connected to the TSE and I am able to turn the volume up to clipping (First time the speakers clipped we didn't know what it was and thought, O' Sh--, we screwed up the speakers). There was no percieved distortion in sound before or after the clipping. I can say that I prefer the TSE as a 'Stand Alone' component. When playing an iPod through the Pioneer pre-outs I can hear a sound that is... Not right??? I know there is no way to state a subjective feeling, so I'll just say that I prefer the iPod connected directly to the TSE for what I perceive as a warmer / better sound.

I do have some "Tweaking" questions that will fit other threads so I will ask them there. Please tell me if you see any glaring deficiencies in my pictures. And don't look at my Mickey Mouse heat sinks. Measuring with a heat gun after being on for hours they read less than 110 degrees.
Attached Images
File Type: jpg DSCN0582.jpg (825.2 KB, 933 views)
File Type: jpg DSCN0581.jpg (585.7 KB, 868 views)
File Type: jpg DSCN0583.jpg (548.4 KB, 366 views)
File Type: jpg DSCN0584.jpg (985.2 KB, 404 views)
File Type: jpg DSCN0585.jpg (718.6 KB, 365 views)
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Old 10th April 2013, 12:19 AM   #229
rmyauck is offline rmyauck  Canada
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Nice amp idea with the TT!

For improved tube rect. life try this mod , and you can use newer faster UF4007 for a few cents more each. George added the mod to his newer SE boards lately.

tube rectifier diode mod
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Old 10th April 2013, 01:34 AM   #230
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Cool! Finally some use for those old disco albums
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