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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 22nd December 2017, 04:37 PM   #441
Evenharmonics is offline Evenharmonics  United States
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Quote:
Originally Posted by Sprags View Post
After admiring the chassis more I bet there is no bottom cover to the plate which prevents overheating. Is that true?
Looks like there is. Even if there are openings at the bottom cover, the heat rises. That amp will appreciate the user by lasting longer if there are vents.
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Old 22nd December 2017, 10:15 PM   #442
spendorite is offline spendorite  Canada
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Quote:
Originally Posted by Evenharmonics View Post
That amp will appreciate the user by lasting longer if there are vents.
Agreed, but then that would greatly diminish the visual beauty of that beautiful wood grain.
It also appears he would only be using the smaller base tubes like EL34 as tubes like KT88 wouldn't fit in there.
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Old 1st January 2018, 11:31 PM   #443
KinklessTetrode59 is offline KinklessTetrode59  United States
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Default My finished 300B

Well it was bit trying at times but i got my 300B working like I want it. Changed a couple of components around to lower B- from -230 to -154VDC. Added more heat sinking, a small fan for the 5 volt regulator. Small mV gauge to monitor the plates of the output tubes. All in all it was a good experience and the sound as you guys know is quite good. I added attenuators for volume and a output transformer impedance selector. Also added small heat sinks to B+ and B- output resistors.

Hammond 276X
One Electron UBT-3
Nichicon/Jensen and JJ Electrolytic's
Mundorf Couplers
Goldpoint Attenuators
Genelex Lions 300B,
Old School Raytheon Black Plate 5842
New Issue Mullard GZ34

Tell me what you guys think...
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Old 4th January 2018, 09:26 PM   #444
colnago55 is offline colnago55  United States
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Nice build.

What are the specs or the part numbers for the wire connections to the board? I've never seen that before on a TSE board.
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Old 5th January 2018, 03:11 AM   #445
DaMuffinMan is offline DaMuffinMan  United States
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Electronic Components and Parts Search | DigiKey ElectronicsClick the image to open in full size.Are you talking about these?
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Old 5th January 2018, 01:07 PM   #446
colnago55 is offline colnago55  United States
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Yes, what spacing did you use? They do not seem to be consistent on the board.
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Old 7th January 2018, 06:51 PM   #447
Tubelab_com is offline Tubelab_com  United States
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The TSE board was designed before I did the "Simple" boards. It actually was never meant to be a DIY "kit" board.....that just happened. The wire spacing is not consistent, but as you have seen people have a way of making things fit. I did the same thing with Pete Millett's big red board.
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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 7th January 2018, 06:58 PM   #448
famousmockingbird is offline famousmockingbird  United States
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My TSE with 45's. The board was gifted to me by a good friend and fellow forum member wdecho. I made the cabinet with a piece of maple I got at Lowes and the top panel was from front panel express.

Sounds pretty freakin good
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Old 5th February 2018, 06:36 PM   #449
drobert001 is offline drobert001
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Default Tubelab SSE Finished - I love it!

Click the image to open in full size.

Power Transformer: EDCOR XPWR035
Output Transformers: EDCOR GXSE15-5K -6 Ohm
Choke: Hammond 159R
Motor Run Cap: 50 uF
Rectifier: Groove Tubes GT-5AR4
Electro-Harmonix 12AT7 EH Preamp Vacuum Tube
Electro-Harmonix EL34 EH Power Vacuum Tube
Switches for Ultra-Linear/Triode Mode and Cathode Feadback
The dial on the top is to switch the cathode resistor value

It's the first tube amp I own and my first electronics build of any kind ever.

Many thanks to George for designing an amp that just about anyone can make and all the contributors to this forum. I never even had to ask a question. It's all here.

This amp sounds fantastic! It's crystal clear with no hum or other noise. The sound is smooth and fluid, but still amazingly detailed.
Instruments are well separated with what seems like a 180 degree stage.

I prefer ultra-linear mode with cathode feedback.

It is more than loud enough for any room in my house, hooked up to my Klipsch Hersey IIIs or an old set of Polk 5 Jrs that I found at an antique store and a separate powered subwoofer.

The Herseys are 8 Ohm and the Polks are 4 Ohm. The 6 Ohm Opts seem to work well with both sets of speakers. I'm glad I went with the Edcors (that don't have the option of multiple secondaries, i.e. 4 Ohm and 8 Ohm), but do have the Ultra-linear tap because ultra-linear is what makes this amp really sound great to me.

I added a second set of RCA connectors to connect the subwoofer.

I removed the diodes from the board after I started blowing fuses after it played just fine for one full day. Then my original rectifier tube (Mullard) sparked out.

I also bought TubeDepot's octal base solid state rectifier as a back-up/cheap alternative for testing, which works fine by the way.
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Old 5th February 2018, 07:34 PM   #450
zman01 is offline zman01  Bangladesh
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Pictures of your Tubelab amp
drobert001,

Congrats on you successful build and nice write up. Amp looks very nice too, and good to know that you are enjoying the sound.
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