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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 20th October 2017, 10:57 AM   #411
Sprags is offline Sprags  United States
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Join Date: Mar 2013
Location: Elgin,illinois
Quote:
Originally Posted by mkane77g View Post
pic
I'm sure your amp performs well but I'm trying to picture how what's outside of the box of the chassis is in relation to what's inside. To take that photo did you rotate the plate 180 degrees from how it would be positioned when assembled?

I talked to an electronics friend that said that it would be OK to mount the choke below the transformers since there is a 3mm aluminum plate between them. He did say I should rotate the choke so it's oriented 90 degrees from the power transformer. But if it's shielded by the aluminum plate why should it's orientation matter?

Oh well... I haven't sent the plate off to have it machined yet so I can revise the layout one more time.

Thankfully I modeled it in Solidworks.

Blake
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Old 20th October 2017, 12:00 PM   #412
randytsuch is offline randytsuch
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AL is not a magnetic shield. You need mu metal for a magnetic shield. So that's why you should rotate
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Old 22nd October 2017, 04:59 PM   #413
Sprags is offline Sprags  United States
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Default SSE Amp Layout

I know I've been working on this forever. I bought a custom sized chassis from Landfall Systems a while ago and tried poking holes and windows in the top plate and though they are OK I am not really satisfied with how they turned out. The step drilled holes have chamfered edges that are uneven. I imagine if I had a drill press they would have turned out better but I don't. Anyway, Landfall said they use a CNC router to machine the holes and windows for a really reasonable cost to me so I decided to re organize the components taking everyone's advice into consideration. My plan is to have all of the components mounted to the top plate so assembly and disassembly will be easier than if I have components mounted to the sides.


I am planning to add all the bells and whistles and that is why I have three smaller switches in addition to the main power switch. I also have the choke mounted as far away from the transformers. And the motor run cap is also shown. My plan is to use adhesive backed zip tie mounts to attach it.


Anyway here are screenshots I just completed.
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File Type: jpg Sprags_SSE_1_02.jpg (223.2 KB, 432 views)
File Type: jpg Sprags_SSE_1_03.jpg (211.3 KB, 422 views)
File Type: jpg Sprags_SSE_1_04.jpg (188.8 KB, 412 views)
File Type: jpg Sprags_SSE_1_05.jpg (142.1 KB, 362 views)
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Old 22nd October 2017, 07:24 PM   #414
zman01 is online now zman01  Bangladesh
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Pictures of your Tubelab amp
Sprags,

Is placing the PT in the middle for aesthetic reasons? With this layout you will have the input wire going very close to the PT, and one of the speaker output crossing the PT too. I am not sure if these would actually cause any issues in real life - just observations.
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Old 22nd October 2017, 09:25 PM   #415
Sprags is offline Sprags  United States
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The VTA ST-120 tube amp I have that is a Tubes4HiFi.com based kit based on the design of the original Dynaco ST-70 has the transformers oriented this way. On the ST-120 the RCS input jacks are in the front and the speaker output jacks are on the back. I figured if anything needs shielding I can do that with sleeves. However thanks for your input.
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Old 23rd October 2017, 02:09 PM   #416
mkane77g is online now mkane77g  United States
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Pictures of your Tubelab amp
Different layouts, results the same. Quite as a Graveyard.
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File Type: jpg DSC_0326.JPG (192.1 KB, 149 views)
File Type: jpg DSC_0327.JPG (140.5 KB, 179 views)
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Old 24th October 2017, 04:24 AM   #417
Sprags is offline Sprags  United States
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Quote:
Originally Posted by mkane77g View Post
Different layouts, results the same. Quite as a Graveyard.
Looks good!
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Old 3rd December 2017, 08:25 PM   #418
asanden is offline asanden  Netherlands
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Two builds:

Tubelad TSE
- Shugang black treasure 300B-Z
- 65mA Bias
- B+ 368V, B- 275V
- Aux caps; clarity cap 70uF+85uF/600V
- Coleman DHT filament reg.
- Ale Moglia gyrator
- Choke Toroidy 9H/29R
- PT Toroidy Audio grade TS200VA 325-0-325@200mA, 6.3V(CT)@4A, 5V@3A
- 2x9V 2x37VA extra trafo (coleman supply)
- OPT Edcor CXSE25-8-5K (don audio GE)
- Auricap 0.22uF/600VDC XO Series
- chassis wood berk multiplex
- preamp DIYA/TB DCSTB/DCG3 Salas

Tubelab SSE
- 12AT7 NOS Mullard or 12BH7 EH (less, but enough gain)
- B+ ...V
- Triode mode
- Rk=330/6W+120/6W=550R
- Shugang black treasure KT88-Z
- Aux cap; clarity cap 70uF/600V
- PT Toroidy Audio grade 370-0-370@240mA, 3,15–0–3,15V@6A, 5V@4A
- 6.3V 75VA extra trafo
- OPT Edcor GXSE15-8-5K (don audio GE)
- Auricap 0.22uF/600VDC XO Series
- replaced the Rk/Ck from the 12AT7 with two Cree SIC diodes, felt it sounded better
- chassis wood berk multiplex
- preamp DIYA/TB DCSTB/DCG3 Salas

No real issues building these, but took some months to complete both chassis after having the amps running on a proto boards after a couple of evenings, except one...

Main issue I had was that I soldered the TSE DHT wires from the coleman reg to the upside of the PCB which caused some troubleshooting hours for I had a bad contact with the 300B tube sockets (causing strong oscillations). I should have taken the time to dismount the PCB and solder the heater wires underneath, will do that next time if I ever dismount it... replacing the current ones.

Happy with my build, both sound very nice, prefer the TSE slightly, but need some break-in on the tubes and my some more listing time.
After some break in I'll measure the FFT's with EMU0202&ARTA, see how they compare to the DIYA Pass VFET/M2 amps.

I'll consider changing the wood painted top plate to 6mm dark glass predrilled, if it is not too expensive, I left the amps run for a while to see if the thermal balance is ok, I may need more venting holes...

Thanks George for a great amp, I bought both boards on DIYA swap meet, next time (maybe a TSE 45 setup) I'll order the boards directly!
Attached Images
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File Type: jpg _MG_2898.jpg (298.4 KB, 157 views)
File Type: jpg _MG_2901.jpg (169.9 KB, 144 views)

Last edited by asanden; 3rd December 2017 at 08:30 PM.
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Old 3rd December 2017, 08:48 PM   #419
zman01 is online now zman01  Bangladesh
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Pictures of your Tubelab amp
asanden,

Congratulations on your successful builds. Look forward to your measurements. May I ask what speakers you are using?
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Old 3rd December 2017, 09:02 PM   #420
asanden is offline asanden  Netherlands
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Thank you.
Upstairs, where I made the amps I have a BR Alpair 7.3 Full range box, They do well with the FR drivers.
I still have to try them on the old 3 way scanspeak downstairs...
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