SUT with Hammond 560L

Hello everybody
I have two Hammond 560-L s that I would like to DIY a MC SUT. According to the Hammond sheet input 1 and 2 is 150ohm. 3 , 4 600ohm. Output 5 ,6 5 k ohm. 7,8 20k ohm. Using 150 ohm input and 20k ohm should yield a l:11.5 step up (l think). Please guide this novice in wiring these transformers and loading resistors (100ohm for MC)
Thanks
Muimui.
 

kevinkr

Administrator
Paid Member
Ratio as you noted is 1:11.5 which would give you about 21dB of gain. To reflect 150 ohm load to the cartridge I would recommend shunting the secondary of the transformer with a 36K resistance (in parallel to the 47K at the input of your phono stage) and see what you think. You can also try it exactly as is, you may prefer it that way.

It is somewhat helpful to know what cartridge you are going to use with these transformers.

This might be a fair match to something like a DL-103 or DL-103R for example.
 

kevinkr

Administrator
Paid Member
Here is the data sheet: http://www.hammondmfg.com/pdf/560L.pdf

Performance is going to depend pretty heavily on the quality of the core material used, it seems to be designed for high level applications. (Magnetizing losses could be a concern)

I would not load it to much below the rated secondary (20K) impeadance as I suspect due to the leakage inductance you may start to have HF roll off.

If you already have them they're worth a shot, if you don't there are some Jensen and Lundahl transformers expressly designed for this purpose that may be even better choices.