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Old 14th August 2014, 04:07 PM   #1
diyAudio Member
Join Date: Aug 2014
Default Help with first Tubelab Build :)

I posted this in the main forum. Did not know
There was a tubelab forum subcatageory

I will need your guys help and a little confidence since
This is going to be my first build.
I'm going to need help

I have some questions before I source parts
I'm building the SE and will order the board

1) When the parts, I want to do
The 300b build. What additional or substitute
Parts do I need or is it just a matter of using different
Tubes and setting bias different ? How would
I go about making the 300b regarding parts
Is what I'm asking I think

2) I want a volume knob however I do not
See a volume knob or value on the parts list

3) I need some help choosing transformers.
I don't mind paying a little extra for good quality
Just as long as I can keep it under 250.00 per OT
And PT. Suggestions would help me.. I want to
Squeeze as many watts as I can

This is where I'm starting it's going to be a great
Project hopefully and I'll post pics along the way

Thank you so much I'm going to need your
Guys help to make this happen
You will have to talk to me like a 5th grader because
I'm still learning I have made a few guitar
Amps in the past but they were all kits and layouts
I'm not great at reading schematics but I'm
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Old 14th August 2014, 05:27 PM   #2
zman01 is offline zman01  Bangladesh
diyAudio Member
Join Date: Feb 2011
Location: Dhaka

Member Sodacose has already responded with some good inputs to your other post:

Mods can maybe merge this into one thread?

On your question #3 on OPT choices, One Electron can also be considered:

Transformer - One Electron, Output, 4800 to 16/8/4 | Antique Electronic Supply

Transformer - One Electron, Output, 3000 to 4/8/16 | Antique Electronic Supply

Both will work, but the UBT-2 will give you less distortion, more damping factor, and slightly lower watts vs the UBT-3.

James 6123-HS is another choice (around ~$265/pair from E-Bay last time I checked). Gives you the felxibility of 2.5k/3.5k/5k primaries and 4,8,16 Ohm secondaries, making it a very flexible solution. The James come potted and are nice looking too. Member Boywonder has a beautiful Tubelab SE with the James-6213HS.

For power the Edcor-131has been used in quite a few builds IIRC:

Another option I found is the Classictone 40-18096:

You will also need a choke - George and other builders have used the Triad C-14x in their builds. It is an open frame unit, so you might have to place it under the top panel.

For volume potentiometer I am using this for my Tubelab Simple SE:

2 Pcs of Dact Type 21 Stepped Attenuator 50K 300B D | eBay

Have fun!
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Old 14th August 2014, 07:19 PM   #3
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denny3249's Avatar
Join Date: Jun 2012
Location: The frozen tundra of Cheeseheadland...
A lot of good info for a 300b build can be found on the Tubelab tubes and application page....

Tubes And Applications

You'll find answers to your OPT and PT questions.... Depending on how you build it, you'll probably get 7-9 watts/channel. This brings up the question of what are the speakers you plan on hooking up.... the more efficient, the better.
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Old 14th August 2014, 07:21 PM   #4
evanc is offline evanc  United States
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Join Date: Sep 2009
Location: New Jersey. About 1 hour from NYC and 1 min. from the beach High-Fidelity Audio Tranformers and Tube Amplifiers
output transformers
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Old 14th August 2014, 07:38 PM   #5
zxx222 is offline zxx222  Europe
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Join Date: Aug 2005
Location: b
I breadboarded my tse with 300b tubes year ago, James iron. Chassis is still not finished (my sse sounded great, so I was not in hurry), but I am listening to it at the moment (less than 20 hours of listening time) and will post photos after it is finally finished.

Volume pot value should be 50k or less, depending on your source. On breadboard I was using alps 50k, in chassis I put TOCOS cosmos 10k - it seems to work ok with both of my sources.

Search forum for "Annotated TSE Parts List" - it was helpful for me. However values of some parts must be adjusted depending to you PT - in my case C4 is 8,2uF 600V, C5 -330uF 450V with 2x30uF mundorf film caps in parallel, B+ is 385 V with tubes biased at 68 mA. It is ok for standard 300b without pushing them to limit, but I plan someday to install EML 300BXLS with B+ 450 V (400V pt secondary) biased at 80-90 mA for more power output and probably will have to use 500V cap in C5 to have some safety margin.

Read everything related to TSE on
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Old 15th August 2014, 02:06 AM   #6
diyAudio Member
Join Date: Aug 2014
Holy cow.. That is over my head lol.. Wow I hope
I can do this ...

I'm not skilled enough to know what parts
Will have to be changed according to transformer
Yikes.... I figured I could get the parts list off
The tubelab site, order what's on the list and
Hook up PT and OT and toss in 300b tubes and
Bias and done ...

If I make a selection of my PT and OT and
Post what I'm using here can someone tell
Me what values I may have to change..
I'm afraid I'll screw something up .

Thank you so much..
I'll choose some transformers
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Old 15th August 2014, 02:42 AM   #7
diyAudio Member
Join Date: Aug 2014
Ok I'm going to order the

Edcor XPWR131 for my PT
As for output Transformers
I will order the Electra-Print
Output transformers

I need 2 of the OT right?
Is there a product number for the
Electra-Print I should use?
On the tubelab page they suggest a TM3kb
With 3.4k no voltage specified though..
With the 300b tubes I want to get as much
Watts as I can ...

I think this is what I'll order ... If im missing
Something let me know remember I'm a green

Last edited by Indigoblue14; 15th August 2014 at 02:54 AM.
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Old 15th August 2014, 03:56 AM   #8
diyAudio Member
Join Date: Aug 2014
Thanks you all.. I just ordered my board
And sent a message to Electra-print getting
Some pricing and suggestions..

Thank you for the patients and understanding
And I'll make u proud of this newbie

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Old 15th August 2014, 07:31 AM   #9
zxx222 is offline zxx222  Europe
diyAudio Member
Join Date: Aug 2005
Location: b
Your output transformers will depend on your speakers impedance (value of secondary winding) and operating point of 300b of your choice for primary winding.
For more power you can use opt with primary in range 2k-3.6k. But power comes at cost of increased distortion and decreased damping factor.
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Old 15th August 2014, 01:02 PM   #10
diyAudio Member
Join Date: Aug 2014
Ok thank you... So with 3k I'll get the wattage
But my sound will be sacrificed. I am starting
To understand. I have never heard a tube amp
That was in the 6 to 7 watt range ..
Do these amps put out decent volume even
With a 5k? I know better not to let the
Wattage rate fool me because it's a tube.

I'm running 8ohm speakers ...
With the primary for the 300b tubes what's
The sweet spot. Is it better to push as much
Voltage as I can ?
I would love to hear some suggestions of
What you guys think/opinions on the
Operating point
I read the tube data sheet for a 300b
But I would love to hear your opinions
Thanks this has been great ..
Thank you...

I ordered my board yesterday and I'll order
Irons and parts on parts list on the tubelab
Website today ..

If anyone has some upgraded parts or a high end
Brand cap or resistors or anything on the list let me know
I'm also going to get a Hammond enclosure and I assume
I can get aluminum or steel with out any issues
Not sure on size though but I hope to take a educated guess
On the amount if space I'll need to mount PT and

Thanks everyone I'm hoping to hear back from
Electro-print today.. If the OTs are super expensive
I'll opt for the UBT-2 or UBT-3.
I looked at the James transformers but I would have to
Order from china it looks like on ebAy . They look
Real nice but I have never worked with that type of
TrNsformer ..

Last edited by Indigoblue14; 15th August 2014 at 01:16 PM.
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