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Summary of Contents for Ceriatone JTM46
- Page 1 JTM46 “All Access”...
- Page 2 Thus, the JTM46 All Access is born – an amplifier that allow the user to have the classic JTM45, as well as versatility from the various new features, thought out from our years of experience catering for modifications on the classic model.
- Page 3 2) QUICK SETUP (for instant gratification) 1) Plug your guitar using a 1/4” instrument cable into the upper I input on the right of the front panel 2) Plug a suitable power cable from the rear panel MAINS cable inlet to your wall power receptacle 3) Plug the amp into your speaker cabinet using 1/4”...
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Page 4: Front Panel Controls
3) FRONT PANEL CONTROLS From left to right: 1) POWER 2-way toggle switch 2) STANDBY 2-way toggle switch 3) RECTIFIER 2-way toggle switch 4) INDICATOR LED 5) POST PHASE INVERTER MASTER VOLUME (PPIMV) control 6) PRESENCE control 7) CHARACTER 2-way toggle switch 8) BASS control 9) BOOST 3-way toggle switch 10) MIDDLE control... - Page 5 RECTIFIER allows you to select Solid State or Tube rectification, for the amp. The tube rectifier used is a GZ34/5AR4, per original JTM45 spec. Please put the amp to STANDBY first, before toggling this switch! POST PHASE INVERTER MASTER VOLUME (PPIMV) is a master volume control that acts after the phase inverter.
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Page 6: Rear Panel Controls
VOLUME I sets the overall volume and gain of the “BRIGHT” channel of the amp. BRIGHT is a 3 way selector which selects the bright capacitor value for the Bright channel. You can select none (Middle), 100pF (Right), or 1000pF (Left). VOLUME II adjusts the overall volume and gain of the “NORMAL”... -
Page 7: Mains Fuse
12) HT FUSE 13) MAINS FUSE 14) MAINS IEC cable inlet SPLIT/SHARED CATHODE switch is to select between the original shared cathode (330uF/820 ohms) configuration for V1, to the split cathode (330uF/820 for V1A, and 0.68uF/2K7ohms for V1B), as seen in later Plexi amps. TONESTACK switch is to select between the original 56K slope resistor + 250pF treble capacitor, to the later 33K slope resistor + 500pF treble capacitor configs. -
Page 8: Impedance Selector
FULL / HALF switches the power output of the power amp. HALF mode configures the power tubes to run in triode operation, and this negates any need to reconfigure the IMPEDANCE SELECTOR. Please turn the amplifier to STANDBY before toggling this switch BIAS TEST and COM multimeter probe jacks –... - Page 9 To save you some time and energy, here are those two values: - Approximate V4-V5 (KT66s) plate voltage for JTM46 amplifier = 455VDC with Solid State Rectifier chosen - Maximum plate dissipation for KT66s = 25W …and now some math.
- Page 10 An example is as follows: 25�� × 65% = 35.7 × 1000 = ���������� 35���� 455������ You might wonder why your DMM is set to millivolts and not milliamps – simply, we have a 1 Ohm resistor placed between your probe jacks and ground to convert a current reading to a voltage reading.
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Page 11: Frequently Asked Questions
Biasing should only be done on a clean workbench with no distractions. Do not wear loose clothing or any jewelry. Take your time, and think carefully before each step. Again, bias at your own risk. Ceriatone Amplification is not responsible for any damages or injuries resulting from user biasing. - Page 12 - We use a combination of parts custom-made for us to our specifications (power transformer, output transformer, choke, high-temperature / low- ESR electrolytic capacitors) and those used in our British series (1/2W carbon composition resistors, 1W carbon film resistors, TAD Mustard capacitors, high-voltage silver mica and ceramic capacitors, Belton tube sockets, and Alpha potentiometers, Cliff jacks).
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