Quote:
Originally Posted by Big Dave
You definitely need to do the hot chassis fix. these were notorious for the cabinets being hot despite all insulators being in place.
|
What's the fix ? better insulators ?
Speaker of hot chassis, there's a big 54 ohm 20W resistor running down one side to drop the filament voltage.
Here's the series wired tube lineup:
3.15 - 3BC5
4.70 - 5J6
3.15 - 3CB6
3.15 - 3CB6
6.30 - 6BA8A
4.70 - 5U8
3.15 - 3DT6
12.6 - 12CU5
6.30 - 6CM7
6.30 - 6CG7
12.6 - 12DQ6
12.6 - 12AX4GTA
6.30 - 10ABP4
----
85 @ 600mA
I plugged that into
this website Reece tipped me off to and got this.
note: I used 120 for the supply voltage. If I use 117, I get 53 ohms @ 19.2 W.
* Dropper resistor = 60 ohms @ 21.6 W
* Dropper resistor with diode = 1 ohms @ 0.3 W
* Dropper capacitor = 22 uF + 17 ohms @ 6W
I like the idea of shaving off most of that wasted 20W. Has anyone tried the diode or capacitor method in a series string TV set ?