Posted by PakProtector [ 152.163.100.65 ] on October 01, 2005 at 19:25:36:

In Reply to: Re: Low gain linestage posted by Damir on September 24, 2005 at 10:11:41:

Hey-Hey!!!,
I got the 'Iron' from Dave. Nice looking stuff. Working out the PS and other details. Building it in a salvaged rack-mounted PS chassis.

PS is from a Dyna SCA35. One 6.3 winding is used to lengthen the primary and reduce HV. The other is running a twin diode 9-Pin rectifier heater. I figured the rarest thing in my box was a Bendix Red-Bank 6754. Its heater-cathode rating is higher than its AC plate rating! Pins out like a WE 412( but I don't have any of those ). I will get an honest 30 seconds until it even considers conducting. Plenty to warm up the cathodes of a 5687.

Choke input with a UTC S-28, a 20 Hy, 100 mA potted inductor. C will be a motor run of ~100 uF. Anticipated B+ to be ~250. 30 mA of load, and I may put in a VR tube just to draw a bit more....and glow in an attractive fashion whilst back lighting the volume knob.

More as it comes...
cheers,
Douglas

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