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Tubelab Discussion and support of Tubelab products, prototypes and experiments

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Old 7th February 2020, 05:43 PM   #1
cogitech is offline cogitech  Canada
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Yet Another SSE Build Thread
Default Yet Another SSE Build Thread

I am guessing that the regulars around here, maybe even George himself, have become a bit bored with these SSE builds. I mean really, how many years has it been?

On the other hand, for people like me this is new and exciting - and I have really enjoyed reading other people's build threads. So I figured I would post my journey.

So far, I have obtained the board and sourced all the minor components, built the board, and have some of the major components - with the rest on the way.

This is what I've decided:

- "Inverted" orientation for under-chassis mounting
- Current inrush limiter on mains primary
- Hammond 274BX
- C1 = Nichicon 47uF 500v
- C2 = Kemet 150uF 500v
- Triad C14X choke
- Kemet 80uF 470vac PP motor run cap
- TR1, D3 and D4 installed
- Binding posts installed for C11/21 and R17/27 to enable easy replacement
- CDE 942 series PP coupling caps C11/21
- 680ohm to start off R17/27 (plan to run EL34 exclusively for quite some time)
- a selection of various other values for R17/27 for future use
- Gold-plated copper inputs and speaker terminals
- 18GA 600v 200C tinned copper silicone hookup wire
- probably DIY chassis - typical wood frame and aluminum top
- not 100% decided on OPTs yet - have some cheap Chinese ones on the way just for testing
- Tubes will be EH EL34, NOS GE 12AT7, and various rectifiers (Shuguang 5AR4, NOS RCA and Sylvania 5U4GB).

Photos of progress so far:

(Note: the way I have oriented the C11/21 and R17/27 binding posts may seem odd, but they make component installation/replacement easier (for me, anyway).

Yet Another SSE Build Thread-2020-02-05_16-35-54_468-jpeg

Yet Another SSE Build Thread-2020-02-05_16-34-59_295-jpeg

Yet Another SSE Build Thread-2020-02-05_14-37-20_806-jpeg

Yet Another SSE Build Thread-2020-02-05_15-02-37_466-jpeg
Attached Images
File Type: jpeg 2020-02-05_14-37-20_806.jpeg (199.6 KB, 955 views)
File Type: jpeg 2020-02-05_15-02-37_466.jpeg (320.8 KB, 476 views)
File Type: jpeg 2020-02-05_16-34-59_295.jpeg (408.6 KB, 479 views)
File Type: jpeg 2020-02-05_16-35-54_468.jpeg (454.5 KB, 487 views)

Last edited by cogitech; 7th February 2020 at 05:56 PM.
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Old 7th February 2020, 06:02 PM   #2
Steady7 is offline Steady7  United States
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Quote:
Originally Posted by cogitech View Post
I am guessing that the regulars around here, maybe even George himself, have become a bit bored with these SSE builds. I mean really, how many years has it been?

On the other hand, for people like me this is new and exciting - and I have really enjoyed reading other people's build threads. So I figured I would post my journey.

So far, I have obtained the board and sourced all the minor components, built the board, and have some of the major components - with the rest on the way.

This is what I've decided:

- "Inverted" orientation for under-chassis mounting
- Current inrush limiter on mains primary
- Hammond 274BX
- C1 = Nichicon 47uF 500v
- C2 = Kemet 150uF 500v
- Triad C14X choke
- Kemet 80uF 470vac PP motor run cap
- TR1, D3 and D4 installed
- Binding posts installed for C11/21 and R17/27 to enable easy replacement
- CDE 942 series PP coupling caps C11/21
- 680ohm to start off R17/27 (plan to run EL34 exclusively for quite some time)
- a selection of various other values for R17/27 for future use
- Gold-plated copper inputs and speaker terminals
- 18GA 600v 200C tinned copper silicone hookup wire
- probably DIY chassis - typical wood frame and aluminum top
- not 100% decided on OPTs yet - have some cheap Chinese ones on the way just for testing
- Tubes will be EH EL34, NOS GE 12AT7, and various rectifiers (Shuguang 5AR4, NOS RCA and Sylvania 5U4GB).

Photos of progress so far:

(Note: the way I have oriented the C11/21 and R17/27 binding posts may seem odd, but they make component installation/replacement easier (for me, anyway).

Yet Another SSE Build Thread-2020-02-05_16-35-54_468-jpeg

Yet Another SSE Build Thread-2020-02-05_16-34-59_295-jpeg

Yet Another SSE Build Thread-2020-02-05_14-37-20_806-jpeg

Yet Another SSE Build Thread-2020-02-05_15-02-37_466-jpeg
Looks good so far, I like the idea of the binding posts, where did you get those by chance? Might try to install them on mine.
These look about right?
8737 Keystone Electronics | Connectors, Interconnects | DigiKey

Keep us posted! I wonder how many of these things this board has seen built

Last edited by Steady7; 7th February 2020 at 06:07 PM.
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Old 7th February 2020, 06:30 PM   #3
cogitech is offline cogitech  Canada
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Yet Another SSE Build Thread
Quote:
Originally Posted by Steady7 View Post
Looks good so far, I like the idea of the binding posts, where did you get those by chance? Might try to install them on mine.
These look about right?
8737 Keystone Electronics | Connectors, Interconnects | DigiKey

Keep us posted! I wonder how many of these things this board has seen built
Hey thanks!

The binding posts I used are very close to those. Same manufacturer, but part number 8730. I have no idea what the difference is (if any). I ordered from Mouser 8730 Keystone Electronics | Mouser Canada

The only thing to keep in mind is to be very gentle with the torque. Set the screws just firmly enough to bind the leads - a bit too much torque and that pin is going to spin and crack the solder joint (a smart engineer would have designed them with non-round pins).

Last edited by cogitech; 7th February 2020 at 06:34 PM.
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Old 8th February 2020, 01:44 AM   #4
cogitech is offline cogitech  Canada
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Yet Another SSE Build Thread
Tube buying addiction kicked in today and I bought 4 6P3S-E tubes. 2 sets of 2 from 2 different ebay sellers. No reason, except that I bought two and immediately thought that a spare set would be good to have. Cheap as chips and by most accounts excellent tubes.
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Old 10th February 2020, 05:03 PM   #5
w5jag is online now w5jag  United States
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Quote:
... - a bit too much torque and that pin is going to spin and crack the solder joint ...
Just an FYI regarding those binding posts ... some of the pads are plated through, and I think that includes some of the coupling cap pads, and maybe the cathode resistor(s), making a connection between the top and bottom of the boards. If that connection is broken or otherwise not made, the board won't work and then you have to reestablish the connection with the component lead.

I don't know if that is applicable to these binding posts, again, just something to keep in mind.
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Old 10th February 2020, 07:01 PM   #6
cogitech is offline cogitech  Canada
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Yet Another SSE Build Thread
Quote:
Originally Posted by w5jag View Post
Just an FYI regarding those binding posts ... some of the pads are plated through, and I think that includes some of the coupling cap pads, and maybe the cathode resistor(s), making a connection between the top and bottom of the boards. If that connection is broken or otherwise not made, the board won't work and then you have to reestablish the connection with the component lead.

I don't know if that is applicable to these binding posts, again, just something to keep in mind.
Very good to know, and all the more reason to exert as little torque as is necessary to bind the leads. Thank you.
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Old 11th February 2020, 03:44 PM   #7
Steady7 is offline Steady7  United States
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You ever come across this thread or something similar? Seems like a good idea to install a switch for tube rolling/trying different tubes. I might give it a shot myself.

Simple SE Cathode Resistor Values
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Old 11th February 2020, 06:39 PM   #8
cogitech is offline cogitech  Canada
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Yet Another SSE Build Thread
Quote:
Originally Posted by Steady7 View Post
You ever come across this thread or something similar? Seems like a good idea to install a switch for tube rolling/trying different tubes. I might give it a shot myself.

Simple SE Cathode Resistor Values
Yes, I actually read all about that on Russ's ( rknize ) blog - Tubelab Simple SE – Construction – metaruss

I decided against doing it, to avoid complexity. I might add it later, but I doubt it. Having the binding posts will allow me to swap resistors very easily when I want to swap tubes. My plan is to get the amp up and running with EL34 and do the check out. Once I am happy with the bias point and the rest of the voltage and dissipation, I am going to stick the Russian 6P3S-E tubes in and see if they need a different resistor value or not.

Basically I am going to gather all the data I need for these two types of tubes and then decide if I am OK doing resistor swaps or if installing a switch is the way to go. I suspect that I will like the sound of one type of tubes over the other and not do much tube rolling after that. Or if I do switch, it will be every few months or so and I won't mind swapping resistors.

The Hammond 274BX arrived yesterday. The Chinese OPTs have not even left the wharehouse (due to Corona, I suppose). I think I am going to go ahead and order the Hammond 125FSE (4.5 pound, 20 watt) OPTs. Here is the frequency response at rated output power (20w). I figure at 6 watts or so they will be flat (+/- 1dB) to 30Hz (at least) which is more than I need.

Yet Another SSE Build Thread-125fse_response-png
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File Type: png 125FSE_Response.png (147.7 KB, 413 views)

Last edited by cogitech; 11th February 2020 at 06:54 PM.
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Old 22nd February 2020, 02:17 AM   #9
cogitech is offline cogitech  Canada
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Yet Another SSE Build Thread
I finally made the decision and pulled the trigger on a pair of Transcendar TT-338-OT. They are expensive, but as they say "you only live once", and "you can't take your money with you."

I have some ideas for a cheap but cheerful chassis. I think I'll start gathering up the pieces this weekend. It may be another month or so (at least) before I am close to powering the amp up, although I do have the cheap Chinese OPTs on the way I could use for testing if everything else is ready.

Last edited by cogitech; 22nd February 2020 at 02:30 AM.
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Old 22nd February 2020, 03:37 AM   #10
zman01 is offline zman01  Bangladesh
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Yet Another SSE Build Thread
Good choice cogitech, and look forward to build updates.
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