TX103/Seduction/DIY

rodneyAB · « **on:** 4 Sep 2003, 06:34 pm »

Hi John
I have finally completed the soldering on my Bottlehead phono kit, and just now hardwired the TX103 leads to the ground plane, which has your loading resistor posts in place of the stock RCA. all components mounted to one chassis plate. I'm pleased with the way this has come together, though I still have to do resistance and voltage checks before I can listen.
rodney

John Chapman · « **Reply #1 on:** 5 Sep 2003, 01:07 am »

Hello!

Should be very fun very soon! I have a few TX103's on seductions out there and I helped a local fellow light up his seduction a while back. It went fine and it is a nice phono stage - a real steal as are all of Dan's products! Let me know if any questions come up or if I can help at all.

Send or post some pics if you can once it is complete - it sopunds like you've done a great job of the case layout!

Many Thansk!

John Chapman
www.bentaudio.com

rodneyAB · « **Reply #2 on:** 5 Sep 2003, 06:07 pm »

got the unit up and going and have listened to some music and I am real pleased at this early stage. started with 2K load. Hope to get some film developed soon.
rodney

John Chapman · « **Reply #3 on:** 5 Sep 2003, 06:48 pm »

Hello!

Couple of questions....

What step-up ratio did you wire for?

What cart are you using?

Thanks!

John

rodneyAB · « **Reply #4 on:** 6 Sep 2003, 07:17 am »

Lyra Clavis DC 0.25 output, 1:20 stepup
rodney

John Chapman · « **Reply #5 on:** 6 Sep 2003, 02:08 pm »

Hello!

If that is a 2K resistor in the input load to the seduction (in place of the 47K usually there) then the net load the cart sees is 5 ohms - which is rather low. Some cart's do spec a really low load but you may want to play with higher load values to see if it is prefferable to your you and your system. If it sounds good to you now just leave it for a week or two then play with loads later when you get the need to mess with something!

Thansk!

John

rodneyAB · « **Reply #6 on:** 6 Sep 2003, 03:39 pm »

About Five ohms is what I was shooting for. I do have a hand full of other resistors to try, that you sent on the cardboard "kit". The 47K is stock, and is still there, the 2K between posts, is in addition to stock set-up. Maybe I do not have this wired right yet!
TX103 lead 9 is attached to a load resistor post, a 47.5K grid resistor connects to same post and to ground plane, plus there is a 220 ohm grid stopper resistor from this same post, connected to tube pin A 7 ( and B7). TX103 lead 10 connects to the other load resistor post, and then to ground plane.
If I were useing your complete kit, I would have you TX103 output cable plugged into an RCA, attached to above 47.5K and 220ohm resistors.
rodney

John Chapman · « **Reply #7 on:** 6 Sep 2003, 04:37 pm »

Hello!

Sounds like the wiring is just fine. I would definitely play with alternate load resistors between the posts once you get a handle on the sound at the current loading.

Have Fun!

John