Go Back   Home > Forums > > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Tubelab Discussion and support of Tubelab products, prototypes and experiments

Reply
 
Thread Tools Search this Thread
Old 22nd February 2020, 03:52 AM   #11
lykkedk is offline lykkedk  Denmark
diyAudio Member
 
lykkedk's Avatar
 
Join Date: Dec 2002
Location: Denmark, Fredericia
They sure look very cool, the specs are too!
Congrats with your'e choice cogitech.

Looking forward to see your'e build proceed

Jesper.

Btw. : what kind of chassis are you considering to build (alu' / wooden ? Both ?)
__________________
DCG3 Dual DCSTB, AK4490 Dual SuperDAC
AlephJ Mimi! http://www.diyaudio.com/forums/pass-...mimi-mini.html
  Reply With Quote
Old 22nd February 2020, 03:32 PM   #12
cogitech is offline cogitech  Canada
diyAudio Member
 
cogitech's Avatar
 
Join Date: Jan 2011
Location: Kamloops, BC
Yet Another SSE Build Thread
Quote:
Originally Posted by zman01 View Post
Good choice cogitech, and look forward to build updates.
Quote:
Originally Posted by lykkedk View Post
They sure look very cool, the specs are too!
Congrats with your'e choice cogitech.

Looking forward to see your'e build proceed

Jesper.

Btw. : what kind of chassis are you considering to build (alu' / wooden ? Both ?)
Thanks guys.

Jesper, my plan is to construct a typical wood base / aluminum top chassis. I have some very high density, multi-ply wood (like baltic birch) that I might use, however what I would really like to do is use teak wood. I would love it to have a classic early 70s look similar to the Dual 1229 turn table (seems to me a Dane was involved in this design ):

Yet Another SSE Build Thread-dual1229-jpg
Attached Images
File Type: jpg dual1229.jpg (66.8 KB, 252 views)

Last edited by cogitech; 22nd February 2020 at 03:37 PM.
  Reply With Quote
Old 24th February 2020, 03:55 PM   #13
cogitech is offline cogitech  Canada
diyAudio Member
 
cogitech's Avatar
 
Join Date: Jan 2011
Location: Kamloops, BC
Yet Another SSE Build Thread
Well I don't think I'll be doing the chassis in teak wood. I checked out prices at the local lumber store and I was a bit shocked. A solid chunk was going to cost ~$200 and it was far thicker than I needed. They also have 3/8" teak ply but it was $85 for 3'x3' sheet.

I might see if there is a piece of teak furniture on the local buy&sell website for a reasonable price, but I suspect I'll end up using plywood I have in the garage. I've got 2 different thicknesses of Baltic Birch and I can stain it to match my speakers.

For the top, I bought a Paderno 14" x 16" uncoated 2mm aluminum cookie slide:
Click the image to open in full size.

It was on sale for $24. I'll use it upside down so the rolled edges are at the sides. They will make lifting/moving the amp easier. 14" x 16" is quite large, but I agree with Morgan Jones that it is much better to have too much space in/on the chassis than barely enough.

I also completed the top layout and began drilling. I have incorporated most of Jones' design principles into the layout, however I have so much real estate on the top that I was able to make it aesthetically pleasing (I think) rather than purely practical. A centre punch and some step drill bits (also on sale) made fairly easy work of it. I am happy to say that the tube sockets and brass stand-offs all lined up adequately on the test fit.

I have also decided to add the following to this amp:

- 2 front-mounted, back-lit, analog VU meters (pure eye candy)
- 1 top-mounted, 0-500v, analog voltmeter to monitor B+
- 2 top-mounted, 0-100ma, analog ammeters to monitor power tube plate currents

This will delay the project by at least another month as I wait for the parts (China).
  Reply With Quote
Old 24th February 2020, 05:50 PM   #14
lykkedk is offline lykkedk  Denmark
diyAudio Member
 
lykkedk's Avatar
 
Join Date: Dec 2002
Location: Denmark, Fredericia
Cool cogitech, great plan you have...

I think that the voltmeters you ordred could be like mine ?
They are fairly easy to hack to get light in, well not 100% perfect but good enough for me through

Jesper.
Attached Images
File Type: jpg image.jpg (716.9 KB, 174 views)
__________________
DCG3 Dual DCSTB, AK4490 Dual SuperDAC
AlephJ Mimi! http://www.diyaudio.com/forums/pass-...mimi-mini.html
  Reply With Quote
Old 24th February 2020, 06:54 PM   #15
cogitech is offline cogitech  Canada
diyAudio Member
 
cogitech's Avatar
 
Join Date: Jan 2011
Location: Kamloops, BC
Yet Another SSE Build Thread
Quote:
Originally Posted by lykkedk View Post
Cool cogitech, great plan you have...

I think that the voltmeters you ordred could be like mine ?
They are fairly easy to hack to get light in, well not 100% perfect but good enough for me through

Jesper.
Yes, they appear to be exactly the same. I may pick your brain in the future about how you added the lights.
  Reply With Quote
Old 25th February 2020, 09:26 PM   #16
cogitech is offline cogitech  Canada
diyAudio Member
 
cogitech's Avatar
 
Join Date: Jan 2011
Location: Kamloops, BC
Yet Another SSE Build Thread
I'm happy to report that the Chinese Cheepies have arrived.

- They have a U/L tap (nice surprise!)
- They weigh 996g and 991g respectively (~2.2 lbs)
- Primary resistance is 370ohms (both the same)
- Secondary resistance between 0 and 8ohm is 1.8ohms (both the same)
- I have no way to test inductance but the claim is 25Hy, which seems entirely appropriate for this size of OPT
- I'm calling it a 6 watt OPT

Note: they are the same size, despite the perspective distortion in the photo:

SE Output xfmrs....who are the current suppliers for not many $$$-68cf7a12-f97c-4b0f-96d7-9d843dc54c80-jpg
  Reply With Quote
Old 25th February 2020, 09:39 PM   #17
cogitech is offline cogitech  Canada
diyAudio Member
 
cogitech's Avatar
 
Join Date: Jan 2011
Location: Kamloops, BC
Yet Another SSE Build Thread
I now have nothing stopping me from hooking everything up an testing, but I think I'd rather get the chassis put together (rough-in anyway) first.
  Reply With Quote
Old 26th February 2020, 12:22 AM   #18
Steady7 is offline Steady7  United States
diyAudio Member
 
Join Date: Feb 2015
Quote:
Originally Posted by cogitech View Post
I now have nothing stopping me from hooking everything up an testing, but I think I'd rather get the chassis put together (rough-in anyway) first.
Looking like a really nice build so far, Probably a good idea to have a "testing" set of output transformers, I've wondered about them myself for some time.
  Reply With Quote
Old 26th February 2020, 04:50 PM   #19
cogitech is offline cogitech  Canada
diyAudio Member
 
cogitech's Avatar
 
Join Date: Jan 2011
Location: Kamloops, BC
Yet Another SSE Build Thread
Quote:
Originally Posted by Steady7 View Post
Looking like a really nice build so far, Probably a good idea to have a "testing" set of output transformers, I've wondered about them myself for some time.
To be perfectly honest, I plan to compare them to the Transcendars and if I can't tell much of a difference at the SPLs that I need/want I might just sell the Transcendars and recover most of my money. I do really wonder how much difference I will be able to hear at 1-3 watts of output power, or even 6-7 for that matter. By April I should know the answer to that.
  Reply With Quote
Old 27th February 2020, 09:24 PM   #20
cogitech is offline cogitech  Canada
diyAudio Member
 
cogitech's Avatar
 
Join Date: Jan 2011
Location: Kamloops, BC
Yet Another SSE Build Thread
Been thinking a lot about frequency response (due to another discussion on OPTs) and I have decided to add a switchable high-pass filter on my SSE just for schlitz n' giggles. It'll look something like this:

Yet Another SSE Build Thread-sse_high-pass-png

Yet Another SSE Build Thread-sse_high-pass-response-png

I already have a bunch of 10nF film caps so I will just parrallel 3 of them and install in series (switchable) with each input channel.

It'll drop 1.4dB at 40Hz and continue to drop from there. My speakers roll themselves off pretty hard right around 40Hz (F10 ~35Hz) so maybe gradually relieving the OPTs and transducers from the sub-40Hz signal will be a good thing. Why drive that energy through those components if I'm not going to hear it anyway and it is possibly/probably going to cause saturation and/or inter-modulation distortion at higher SPLs? Room modes tend to give me loads of low bass gain, anyway.

The switch will probably get switched back and forth a few dozen times in the first week and then stay in one position for years, but what the heck. Cheap thrills.
Attached Images
File Type: png SSE_high-pass.png (15.6 KB, 173 views)
File Type: png SSE_high-pass-response.png (17.2 KB, 173 views)

Last edited by cogitech; 27th February 2020 at 09:48 PM.
  Reply With Quote

Reply


Yet Another SSE Build ThreadHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Mod-286 build thread HarmonicTHD Chip Amps 201 16th January 2020 05:38 AM
F5-HA Build Thread cloud85 Pass Labs 57 29th November 2016 07:34 PM
SE - Build Thread soundengine355 Solid State 6 27th June 2009 12:19 AM
My SE KT-88 Build thread athos56 Tubes / Valves 13 21st December 2008 06:16 AM
The ESL Build Thread BillH Planars & Exotics 172 8th November 2006 09:01 PM


New To Site? Need Help?

All times are GMT. The time now is 11:34 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki