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In Reply to: You have hit the nail on the head ... posted by drlowmu on March 15, 2007 at 06:48:16:
C'mon Jeff, don't be a tease `,;^D) You mean a 600/~ stepdown after the Daven?
I think I also saw a post of yours somewhere talking about a single gain stage. Did you try it both on the in and the out?
Follow Ups:
Hi,The Daven T attenuators ( and an absolute phase reversal switch ), all get used after the 15K to 600 ohm step down, when you have a balanced signal to process, all at 600 ohms Z.
It was a single triode gain stage, usually a 5687, cap coupled into a Peerless 1509 as I recall the number. Clearer to you now ??
Regards,
Hi Jeff , thanks for your reply. "Is it clear to me now?" Well, partially, but I can still imagine several variations, so in other words no. If you have the time and inclination can you walk me (us ?`,;^) through the whole sequence of stages from in to out?Thanks !
I don't have my design notes here, so its from memory.1) A 5687 gain stage, as I recall, a 211 ohm grid stopper
2) 2 uF coupling cap
3) Altec 1509 15K to 600 ohm step down trannie
4) Absolute phase switching, DPDT swiches, On- On
5) Daven 600 to 600 ohm bridged T attenuators ( constant impedance )
6) Biamp L/C line level crossovers at 12 dB octave, used either vintage UTC VIC or HVC - series adjustable inductors, and set crossover for about 400 Hz for RCA field coils.
7) Three sets of RCA output jacks, Full Range Out ( off of the 1509 trannie secondary ). Low Out and High Out.
Thats all there was to it . Kimber Kable TCSS wire, multiple paralleled runs on grounds and B + es. Wonder solder. Go for it.
Jeff Medwin
Thanks Jeff, now I see.
One of the things I was wondering about was where you had put the tube, on the in or out-put. I thought of reasons why I might want it on the output but that made four triodes appear out of thin air. A single dual triode at the input looks neat (in my mind anyway`,;^)
Thanks for sharing your stuff. It's helpful !
Ian
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