TOP View

B+ FUSE

MDL 1/4

(underneath)

TUBE LOCATIONS - See the diagram above for the proper tube locations. Power should be unplugged and the tubes cool before handling them. We label the tube sockets, test points and trimmers to help. It is possible to put tubes in wrong if you bend the pins - not good. On this diagram we added dashed lines to further clarify which test points are associated with which tube and which trimmer but they are numbered right on the chassis.

Refer to pages page 14 & 15 if you are unsure about replacing tubes and setting the bias. A full description is given.

Once that you've learned a bit about setting bias, we provide a bias trim pot and test point for each tube that should be referred to ground or TPG (The butt of the Stingray). Aim for .25 DC volts or 250 mV DC. All of the important info is silk- screened on the chassis.

Notice that there are two fuses for the B+. These are 250 mA Slo-blo ( MDL 1/4) types. They are supposed to blow with some types of tube shorts and prevent damage to the amps. ALWAYS let the amps sit unpowered for at least 20 minutes before attempting to check them out - SHOCK HAZARD - there can be very high volts here until the power supply capacitors discharge. See page 8 for details.

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