Randall-amplifiers THRASHER 50 User Manual download pdf (Page 4)

Rear Panel Controls

MAINS SWITCH: Selects the country voltage.

For 100-120VAC selections, change IEC fuse to T5A/250V fuse.

For 220-240VAC selections, change IEC fuse to T2.5A/250V fuse.

The H.T. Fuse remains unchanged.

MAINS INPUT: AC wall power via included IEC cord to a grounded

outlet

HT FUSE: Protection for AC power faults.

CH/BOOST: TRS switching jack for footswitch,. Tip to ground

switching type. Tip=Channel and Ring=Boost select.

(2 button LED footswitch included)

LOOP: 1/4" tip to ground switching jack to bypass loop via

external switching unit or footswitch (not included)

TEST POINT & BIAS:

Using a Digital Multi Meter, set it to DC mV(olts) and insert the black probe

into the COMMON meter jacks and the red probe into either TEST POINT

meter jack.

Set MASTER volume fully counter clockwise and take the amp off

STANDBY, measure and set BIAS INSIDE 2 or BIAS OUTSIDE 2 located

below the test points. Adjust the bias pots slowly.

Please note that the reading is the sum of 2 power tubes. Factory settings

for 6L6 at either TEST POINT is 72mV, EL34 = 76mV, 6550/KT88 = 84mV.

T.5A FUSES: Fusing for the two inside pair and two outside pair of output

tubes. In case of output tube failure, only the problem pair of tubes will

drop out of circuit leaving you to finish your gig!

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Randall-amplifiers THRASHER 50 User Manual Page 4