Ortofon Per Windfeld Load Impedance?

Larryi : thank you for your comment. The tron seven designer encouraged me to do tube rolling with this unit. I tryed first NOS Mullards 12AX7 wich improved the sound but a little too lean to my taste. The best results are with NOS Telefunkens 12AX7 in my system. The output buffer 12AU7 is already fit is a NOS GE USA. I will be interested in your week end discoveries. I will also try to put a resistor to achieve the 845 ohms for the A.Finish. Who knows, it can improve even more the sound, but this cartridge/phono couple is made in heaven.
Best regards.

Jloveys,

Perhaps you should ask Allaerte about the right resistor to achieve proper dampening of the cartridge. I bet the value is different from the 845 ohms specified, given that the primary of the transformer represents a load different from that of other types of phonostages so the proper value might be different. If Tron supplies you information on the turn ratio, etc. of the transformer, I bet Allaerte can give you some suggestions.

The other alternative is to just experiment with different values. This should be relatively easy to implement. Just solder in a resistor between the hot and ground tabs on the back side of the RCA jack going into the Tron.

By the way, if the Mullards sound too lean in your setup, I would bet that the ECC803S would be EXTREMELY lean to you (a good thing, perhaps, given the CRAZY price for 803S' these days).

If you don't have Tele ECC803S in hand it is an extremely expensive price for an experiment ! The classic ECC803 are wonderful here. Have fun and happy listening.

a new topic is probably in order since we are veering substantially here, feel free to start it if you want and I'll toss in my thoughts.

(are there moderation / splitting of thread possibilities here?)

dave

Oops sorry, I meant classic ECC 83 ...