| Author: | Henry Ramsey (registered user: 2955 posts ) |
| Date: | Fri, Apr 20th, 2012 @ 16:10 ( . ) |
On 04/20/2012 @ 10:04, Merlin wrote :
From 4 to 5 on the 12A_7 heaters or pin 4 to ground.
On 04/20/2012 @ 08:35, Henry Ramsey wrote :
: : Strange thing is the heater voltage reads 11.9VDC loaded with the one tube and only about 6VAC. : : Measured between where and where, and with what? If you have it wired up the way I think you do, then there is no DC in the heater, only AC. -- One comes from the CT the other is grounded. You asked for a schematic the other night. Here's just the power supply. I hope that makes things clearer. [link] Sorry for the mixed drawing, but I couldn't find schemtic diagrams for V-regulators. It's derived from this schematic: [link] I got the above schematic in PDF format from somewhere and I can't remember where. Paul Fawcett found this website that seems to be a primitive version of the same thing: [link] The power supply is slightly different without regulated plate supply and w/ series heaters. On the second page the schematic looks like Stephane's Sopht amp or an early version thereof. |
--- 12 Users Online --- 39 Recent Unique Posters |