need assistance on SSE build

[a3cervo]

thanks sunil.

Looks great.

 

[a3cervo]

Francois G,

you're right, forgot to mention those details, tubes for this build are JJ EL34, Jan Philips 12AT7 and Sovtek 5AR4.

OPTs are 5K with 4\8\16 ohms taps, 15w.


Thanks and regards.

Looking through the thread I did not see mention of the output tubes, the operating point and details about the output transformers (primary impedance). That might help in getting a more intelligent reply.

Without that, IMHO, your speakers present a very benign load and should do well on the 8 Ohm taps, unless your transformers reflect a low primary load for the output tubes you plan to use.

Nice work. Good luck.

 

[Francois G]

With those characteristics the 8 Ohm taps will be best for your setup, in my opinion. Your power output will be decreased unnecessarily if you use the 4 ohm speaker taps on you (mostly) 8 ohm speakers. But doing so will likely reduce distortion some and you may prefer that. Since you have these options on your transformers try both!

 

[a3cervo]

Francois G, will start with the 8ohm tap and try the 4ohm later on. thanks!

Has anyone done 2 sets of speakers output on their SSE, 1 set for 8ohm, another for 4ohm?

 

[sunil]

So what rectifier you planning to run? Whats the first cap ?

 

[PDL]

Francois G, will start with the 8ohm tap and try the 4ohm later on. thanks!

Has anyone done 2 sets of speakers output on their SSE, 1 set for 8ohm, another for 4ohm?

Several amps include this arrangement with even four, eight, and sixteen ohm speaker jacks. Since your OPT supports it and it only requires four more jacks, I would take advantage of it.

 

[a3cervo]

going tube rectified with Sovtek 5AR4, C1 is Cornell Dubilier 380LX.

So what rectifier you planning to run? Whats the first cap ?

 

[a3cervo]

would love to do this but to be honest i am not sure how to 😀

been searching builds and can't find reference.

Several amps include this arrangement with even four, eight, and sixteen ohm speaker jacks. Since your OPT supports it and it only requires four more jacks, I would take advantage of it.

 

[Tubelab_com]

Choose option 1 or 2 , repeat for the second channel.

1)Mount two sets of dual banana jacks on the back and wire the common connections together and connect it to the common (0 ohm) wire on the OPT. Connect the 4 ohm wire on the OPT to the hot terminal on the 4 ohm jack and the 8 ohm wire on the OPT to the hot terminal on the 8 ohm jack set.

2)If using individual banana jacks you can mount the common one (I used black) in the center of three jacks, with one jack on one side for the 4 ohm output, and another on the opposite side for the 8 ohm output. When plugging in speakers you use the common black jack with one of the other jacks for 4 or 8 ohms.

Here is the under chassis picture of my old SSE. The chassis is far too small but I had very limited space in my Florida house. I was going to use red for the 4 ohm jack, and green for the 8 ohm jack, but only had one green jack.

 

[a3cervo]

You're the man George! big thanks for this.

 

[sunil]

going tube rectified with Sovtek 5AR4, C1 is Cornell Dubilier 380LX.

Hope this helps - I built the TSE-II (300b) with 5AR4. First cap of 47uF and have a choke (7H).

With 330-0-330 secondaries I get 377v B+. I'm using a Japanese Matsushita 5AR4.

 

[a3cervo]

update; my Tubelab SSE project is alive!

Right now it is in basic triode connection without feedback, it has been playing flawlessly from first power up and the past couple of days.

thanks for all your help here, i appreciate it.

 

[Francois G]

Congratulations! Nice looking amp!

 

[a3cervo]

thanks Francois G.

Big thanks to George as well for the pcb and the continuous support here.

cheers!

 

[sunil]

Nice looking build a3cervo.

 

[a3cervo]

Thank you Sunil

It sounds even nicer than it looks 😉

I kept seeing a particular impression "quiet as a graveyard" when they describe their SSE build and it is true. No hum or buzz so far on mine, it is as quiet as my diy F5 amp.