11-10-2006, 11:05 AM
I've built these supplies using an LM338T regulator which is rated at 5A, and comes in a TO-220 package. Yes, I know, 5A is overkill for the Model 38...but the TO-220 came in quite handy in terms of size reduction and operating temperature. Clip a heatsink on top and it is good to go. When powering a Model 38, it runs warm instead of red hot as an LM317 would.
I had to build one of these power supplies INTO the chassis of a Model 38 once for a client. Worked out quite well. I had to mount the power transformer on top of the chassis where the unused Type 6 ballast socket was (removing that socket to allow space for the transformer wires to pass through), and a perfboard with the power supply components directly underneath.
I'll scan the schematic of my design later today and post here.
I had to build one of these power supplies INTO the chassis of a Model 38 once for a client. Worked out quite well. I had to mount the power transformer on top of the chassis where the unused Type 6 ballast socket was (removing that socket to allow space for the transformer wires to pass through), and a perfboard with the power supply components directly underneath.
I'll scan the schematic of my design later today and post here.
--
Ron Ramirez
Ferdinand IN
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
