Just found these in a drawer. ?PreII OPTs?

[bob orbell]

Glad to hear the Pre 3 is in use Ali, how do you find it compared to your Pre2? . Colin, if you read this is your Pre C/F up and running. BOB

[Ali Tait]

A definate improvement Bob, and it's far more immune to picking up hum than the 2, which is a good thing!

[bob orbell]

Glad to here that it's OK Ali.

[colin.hepburn]

Originally Posted by bob orbell

Colin, if you read this is your Pre C/F up and running. BOB

Hi Bob
I haven’t got the CF Pre 2 up and running to busy decorating and tiring to fit new carpets which is taking me forever so all the hi if is packed away for now and I will be sorting out a new rack system for it All
I have still to make up the power leads with the new plugs I got from farnall looks like a bit of a pain to solder these i fear

[bob orbell]

Hi Colin, they are easier than 7 pin din,. Let us know what you think when you get back to normal, just for reference I have put my PSU back to series ii spec. and using a 200 volt zener for the Pre C/F as in Neal Gibbons FAQ, and it doe's seem to sound better. BOB

[colin.hepburn]

Originally Posted by bob orbell

Hi Colin, they are easier than 7 pin din,. Let us know what you think when you get back to normal, just for reference I have put my PSU back to series ii spec. and using a 200 volt zener for the Pre C/F as in Neal Gibbons FAQ, and it doe's seem to sound better. BOB

Hi Bob
Thanks for the update think i will just do the same

[Greg.]

Originally Posted by bob orbell

I have put my PSU back to series ii spec. and using a 200 volt zener for the Pre C/F as in Neal Gibbons FAQ, and it doe's seem to sound better. BOB

Now that is interesting because when Peter C first brought out PSU III, it buzzed and in consequence he upgraded so it could comfortably handle both Pre and phono III at the same time.

[bob orbell]

Yes Greg, but Peter was not using a C/F pre, it was the new pre3, I did a few small tests and found the H/T was changing at the anode in the pre C/F, not by much, but going back to the ll values and adding the zener, the H/T is now very stable. BOB

[colin.hepburn]

Hi Bob
Where did you get your 200 volt zener Diode From cant seem to find them only 5w 200v will that do

[bob orbell]

Yes Colin, that's what I used 5w, the orig. 100v was only 3.5w, don't just put the zener in without changing the resistors, it will go pop. Do you have the II C/D?, if not I have one I will send to you. BOB