Admiral 3A1 is listed as being in Sam's Photofact #2 but may not be in Rider. Check with your local library. They can usually get Sam's Photofact. Sams and others sell the information. Their number 800-428-7267.
You should be able to use the audio portion of a radio schematic. These 3 tubes were used in many AC/DC five tube radios.
Contact richard@nostalgiaair.org about the long download. It doesn't seem to bother some of us. We just work on the top portion.
Norm
: Could you help me find a schematic for an Admiral phono model 3A1ANhis is a small amp with 3 tubes-12AT6-50B5- and 35W4--Thanks again--May I ask why you keep all of the old messages on the forum for so long? It takes forever to download the site with so many old messages on there- It seems that 2 or 3 months would be plenty long--