MatthisD

Re: Transformer lists for projects.
« Reply #100 on: July 27, 2016, 08:57:16 AM »
Assuming the Cinemag version is identical then there is  no need to change the circuit. Connect the primaries in parallel for 3125 ohms and secondary for 600 and also the feedback winding connected to ground at one point which acts as an electrostatic shield.

If you get a chance to measure the resistance of the windings please let us know.


Murdock

Re: Transformer lists for projects.
« Reply #101 on: August 12, 2016, 04:21:38 PM »
Hey Matthis, thanks for your reply! Sorry for my late reply, I just had the time to look into this.
Is this the right way to connect the S217D in the G-Pultec?



The numbers in the S217D diagram are just to show the corresponding Lundahl pinout.

MatthisD

Re: Transformer lists for projects.
« Reply #102 on: August 12, 2016, 07:38:37 PM »
Yes, the resistor on the secondary might not be needed.

Murdock

Re: Transformer lists for projects.
« Reply #103 on: August 12, 2016, 08:47:33 PM »
Thanks!
OK, I will try with and without the resistor. When I leave the resistor out, should I put a jumper in place of the resistor?

MatthisD

Re: Transformer lists for projects.
« Reply #104 on: August 12, 2016, 09:59:42 PM »
No jumper, although you would need to be able to measure  the frequency response to see what effect that resistor has.

dukasound

Re: Transformer lists for projects.
« Reply #105 on: June 17, 2017, 12:43:19 PM »
On first LA-2A I used Sowters, on second Jensen JT-11P for input and UTC A-24 for output. Can I use Lundahl 1:1 LL1540 on input on next project??


 

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