Passive pre out from kel84

[jimangus]

Hi David,

its a little unusual this but i have changed it back to 1M and the hummmm has gone.

I would think it is input impeadance. The MF X-Pre has possible got a particularly high output impeadance compared to the preamp you use.

I will try a 500kr at some point to see if that works. And then 250kr etc.

Now to bypass the volume on a single ended triode el84 amp, to see if that works.

Then tommorrow wire up the active x-overs.
See if all this faffing has been worthwhile.

Regards
Jim

Regards
Jim

[jimangus]

Erm i spoke to soon. The hummm is back, once the amps had warmed through. It is not as persasive as previous but still there. Hmmmmm i'll carry on playing and report back.

Jim

[jimangus]

The active x-over turned up today, am in the moddle of a production line to make the cables. Thr first attempt i didn't balance the cables and it hummmmed like a good one. With balanced cable it has introduced a little hiss at high volume but nothing major.

Maplins did me today as usual, a last minute dash to get some 3pin xlrs, i asked

" could i have 2 3 pin female xlr's"
reply " certainly sir there you go"

Get home and find one 3 pin xlr and one four pin. Thanks a bunch!!! A three hour round trip in the rain (including a medicinal pint break on route) from where i live. And they over charged me for some bannana plugs grrrrrrrr. I may boycot them altogether from now on. £3.40 for an xlr its a joke, i think they are only 1.40 from rapid.

Moan over

I'll report back once i have a fully functioning active system.

Regards
Jim