Gibson Goldtone GA-30RVS Schematic Diagram
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Gibson Goldtone GA-30RVS Schematic Diagram

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Summary of Contents for Gibson Goldtone GA-30RVS

  • Page 4: Circuit Discription

    GIBSON ‘GOLD TONE’ GA-30RVS CIRCUIT DISCRIPTION Please refer to circuit diagram for DC voltages and other information INPUT SECTION AND PREAMP SK1 and SK2 are the HI and LO sensitivity inputs respectively. When the LO socket is used R51, R52 and R83 act as a potential divider to reduce the input level to the preamp.
  • Page 5 REVERB AND EFFECTS LOOP SECTIONS The signal from the preamp is fed into IC3A which is configured as a boot strapped voltage follower. Z1 and Z2 have been added to prevent any nasty spikes from damaging the opamp, this should in practise never happen. The output of IC3a is fed to the reverb and effects loop sections.
  • Page 6 POWER STAGES The two phase splitters (V3 and V4) are differential input splitters which each produce the anti phase signals necessary to drive the push pull output stages. The outputs from V3 drive the EL84 power valves V5 and V6 for the left side power stage. V4 drives V7 and V8 for the right side power stage.
  • Page 7 TR7 and TR10 provide a constant current source for Z3 the 15 volt zener. The output voltage is set by the ratio of R119 and R120 which provide the feedback to TR8 via TR11 and TR12 to stabilise the whole circuit. TR9 with R121, R122 and R123 form a current limiter.

  • Page 8: Rear Panel Controls

    VELOCETTE TWIN VALVE GUITAR AMPLIFIER Introduction Congratulations on your purchase of a Velocette Twin. The Velocette Twin is part of the Trace Elliot Velocette range. This is basically a range of no nonsense, compact, valve guitar amplifiers with the minimum controls necessary to produce a good range of sounds.

  • Page 9: Footswitch Sockets

    VOLUME PULL GAIN This is a push/pull potentiometer. Pushed in the control acts like a normal volume control on a typical non-master volume amplifier, therefore it sets the overall volume level of the amplifier and has a huge effect on the tone and the amount of overdrive. From low to about halfway, depending on the output level of the guitar and which input socket is used, the sound should remain reasonably clean.

  • Page 10: Effects Loop

    These sockets are for connecting to latching footswitches. The first one is dual function and operates the extra gain stage (with VOLUME pulled out) and reverb. The second turns the effects loop on or off if used. EFFECTS LOOP This has sockets for SEND, LEFT/MONO RETURN and RIGHT RETURN as well as a switch for SERIES or PARALLEL configuration.
  • Page 11 These have been provided throughout the Velocette range so that the user can connect them to external 16 speaker cabinets, such as 4x12s, for different sounds. This is useful for both live and studio use and will radically change the sound and volume of the amplifier. As the Velocette Twin has two power stages two external speaker outputs are provided, as is or 16 impedance selector switch which sets the output impedance for both sockets.

  • Page 12: Technical Specifications

    In the event of having to replace the mains fuse always use the same rating and type as marked on the unit’s rear panel. Using one of higher rating will invalidate the guarantee. If after replacement the mains fuse should blow a second time, immediately refer the unit to a TRACE ELLIOT approved service engineer for checking.
  • Page 13 TONE CONTROL SINGLE DUAL FUNCTION PASSIVE CONTROL REVERB 3 SPRING TRAY WITH MODIFIED OUTPUT TO PRODUCE PSEUDO STEREO REVERB EFFECT SEND IMPEDANCE 10K NOMINAL SIGNAL LEVEL -20dBu LEFT/MONO RETURN IMPEDANCE 470K NOMINAL SIGNAL LEVEL -20dBu RIGHT RETURN IMPEDANCE 470K NOMINAL SIGNAL LEVEL -20dBu CIRCUIT TOPOLOGY PREAMP AND POWER STAGES 100% VALVE REVERB AND EFFECTS LOOP SECTIONS DRIVEN BY...
  • Page 14 C32-PCB-PC00068x4 LINKS CHANGED FOR USE ON GIBSON GA-30RVS ISSUE 4 17/12/98 PS Description Part Code Where Used PC00068 RESISTORS 0 ohm link 72-RCZERO R47 R49 (16 Ohm x2) 1/4W 72-RM2R7 R121 R122 R123 1/4W 72-RM10R R24 R25 R126 R127 1/4W...
  • Page 15 120R 72-RWW120R-6W R71 R73 470R 2.5W 72-RWW470R-2.5W R116 72-RWW1K-6W R115 SEMICONDUCTORS 1N4002 72-D-IN4002 D11 D12 D13 D14 1N4007 72-D-IN4007 1N4148 72-D-IN4148 GP02-40 (4KV) 72-D-GP02-40 9V1 ZENER 72-D-BZX55C9V1 15V ZENER 72-D-BZX55C15V 2N3904 72-T2N3904 TR2 TR3 TR5 TR6 TR9 TR11 TR12 2N3906 72-T2N3906 TR7 TR10 J175...
  • Page 16 35V tant 72-C1.5-35VT 35V tant 72-C2.2-35VT 35V tant 72-C4.7-35VT 450V elect rad 72-C22-450VER C70 C71 C72 C73 C74 63V elect rad 72-C47-63VER 100u 16V elect rad 72-C100-16VER C26 C40 C46 C47 C49 C52 C85 C87 100u 400V elect rad 72-CAP-100400V 220u 35V elect rad 72-C220-35VER...
  • Page 17 HEATSINK ETC TO220 HEATSINK E13-HS-TV2 Part of heat sink assembly M3 SCREW 71-SCR-M3X12PPB see diagram supplied M3 SHAKE PROOF 71-WAS-M3INTSP “ M3 PLAIN WASHER 71-WAS-M3ABLK “ M3 NUT 71-NUT-M3-ZINC “ INSULATING KIT 72-MOS-PAD-TO220 “ Put between TR8, heat sink & chassis Heat sink compound FLYING LEADS Cathode heater lead...

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