1. What is the pin layout? 21193, 21194, 4565, etc... 

DEVICE SPEC 1.PDF - DEVICE SPEC 2.PDF

These files include most of output devices Carvin uses on Power Amps like the DCM line and the BX line.

2. How can I tell if the Battery in my S400 is being charged? 

Tech: Click on link for full detailed instructions.

S400 Battery Charging Procedures.PDF

3. How do I add a second battery to my S400D?

File includes detailed instructions with pictures.

Procedure.PDF

4. 1978 Tech Sheet. 

File contains information on older tube, and transistor layouts. tech sheets 1978

5. Tube Amp Troubleshooter. Vintage series (VT50, Nomad, Bel Air, and current Vintage 33) and Valve Master series (Stage Master 212, Club Master 112, and Valve Master 100) 

File includes detailed instructions.

Tube amp Troubleshooter.PDF