by EWBrown » Wed Jun 04, 2003 8:08 am
If you're using DC for the filaments, having a 6A (or higher) rated FWB, just heatsunk to the chassis should be good enough, if you go for regulation, then either sinking the pass device to the chassis, or an internal heatsink with a small CPU fan should work.
I've seen it advised, if you run the filaments DC, reduce the voltage level around 10%, use 5.7 VDC for 6.3V tubes, 11.4 for 12.6V, etc.
So, what is the tube lineup? 12AX7, 6SN7, 2X EL34, and 5AR4/GZ34 (or solid state) rectifier (latter assuming you use 5VAC to rectify to DC) ?
I've been "loading up" on EL34s, to fix the old Dynaco ST-70, for the Eiclones, and a "Dynaclone" I'm planning on for next year.
That would basically be a set of Dyna ST-70 replacement trannies, an unpopulated ST-70 chassis amd cage from E-bay, and I already have a spare "upgrade" PCB. ANd a choke for the power supply.
If the chassis is too grungy and rusty, it can be either painted, or cleaned up and sent off to a motorcycle parts shop for chrome plating.
/ed B in NH (still screwin' off instead of workin')
Real Radios Glow in the Dark