User manual HIWATT CUSTOM TAPE ECHO

[. . . ] This limited warranty gives you specific legal rights which vary from state to state and is in lieu of any and all other warranties either expressed or implied except as may otherwise be required by law. 2005 CLASSIC SERIES AMPLIFIERS Thank you for purchasing a HIWATT product. A look inside the amplifier will reveal point-to-point hand wiring, turret tag boards (no printed circuits), and hand laced wiring harnesses. The power and output transformers are manufactured by Partridge, the original 1970's supplier to the original design sheets. The components and wires are the modern available equivalents of the vintage components, 1-watt carbon resistors, and wound polyester capacitors being used throughout. CUSTOM 50W and 100W Heads Thank you for purchasing a HIWATT product. [. . . ] These amp heads are as exact a replica as possible of the DR103's and DR504's that were built in the early seventies under the ownership of Dave Reeves. CUSTOM 50W Combo Based on the original "Bulldog" combo, the Custom 50 combo combines the 50watt amplifier head with a specially designed 12" Fane speaker, all built into an 18 marine ply cabinet. CUSTOM 20W Head and Combo Designed for the tube amp lover who prefers the rich, uninhibited tone of pure Class A, we offer the Custom 20. Powered by two EL-84 valves and utilizing a high gain controlled preamp in addition to it's point-to-point wiring with four 12AX7 valves, the Custom 20 serves jazz, pop and rock guitarists alike. The 20watt Combo features a powerful 10" Fane speaker. CUSTOM STUDIO/STAGE COMBO Using a specially wound output transformer, the Studio/Stage combo can switch from 20 watts to 40 watts of power, while retaining its Class A pure tone. Features gain with switchable boost, full size accutronic spring reverb and 12" Fane speakers. CUSTOM 200W and 400W Bass Heads Designed to the same specification and construction as the DR201 and DR405 respectively, the HIWATT Custom 200 and 400 feature KT-88 power tubes for the optimum level of output ( 4 x KT-88 in Custom 200 , 6 x KT-88 in Custom 400 ), 4 x ECC-83 tubes in the preamp section (add 1 x ECC-81 in the Custom 400 ), and Partridge transformers. Adjustable 4, 8 & 16 ohm output impedance. BEFORE OPERATING THIS EQUIPMENT CAUTION: Extremely high voltages exist in this amplifier and there are no user serviceable parts. For maintenance or in the unlikely event of a repair being required, refer to HIWATT Amplification only. DO NOT OPERATE THE AMPLIFIER WITH ANY OF THE COVERS REMOVED. WARNING: EXPOSURE TO HIGH SOUND VOLUME MAY CAUSE PERMANENT HEARING DAMAGE. Check that the voltage selector is set to the correct wall voltage. Always connect a loudspeaker system of the correct impedance (4, 8 or 16 Ohms) and set the impedance selector to that value prior to switching on the amplifier. Allow the amplifier to warm up for two minutes before switching the standby on. The standby can also be used as a mute, for tuning or a quick string change. DO always check the voltage and impedance settings especially when touring or in a studio setting. DO remove AC mains socket if amplifier will be stored for long period of time. DO have the output tubes replaced regularly and use only matched sets of EL34's. The output valves affect the sound of the amplifier and different players like different tubes. An average set of quality valves should last for approximately 2000 hours of use, about 5 hours a day for a year. This is the maximum period for a premium original sound. Always disconnect the amplifier from the mains and allow the valves, all of which run very hot, to cool prior to replacing them. DON'T replace the ECC81 with an ECC83 as this will produce an extremely unstable high frequency response that will not be controllable. [. . . ] DON'T replace the ECC81 with an ECC83 as this will produce an extremely unstable high frequency response that will not be controllable. As for the preamp valves we recommend that they are kept in until they cause trouble. Symptoms of this are noise, popping and microphone squeals or rattles through the loudspeaker. DON'T disconnect a loudspeaker lead at the loudspeaker end if the amplifier is still operating (The single situation most likely to cause damage to a valve amplifier is driving it into an open circuit). [. . . ]