[jrblasde]

Very strange, this chassis doesn’t at all match the model 610 in the Rider’s manual. That one shows a power transformer and all tubes have 6V filaments, whereas mine lacks a power transformer and has the following tubes:

• 6J8 
  
• 78
  
• 75
  
• 6AC5
  
• 76
  
• 80 (this socket was marked “80”, but has a Philco 6A3 tube installed).
  

The chassis is laid out exactly as the model on Spiegel pages 13-3 and 13-4 of Rider’s 13th edition.