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Over the course of the 70s, the Japanese output improved dramatically, and in many ways these early 70s models are a low point for the brand. These new Epiphones were based on existing Matsumoku guitars, sharing body shapes, and hardware, but the Epiphone line was somewhat upgraded, with inlaid logos and a 2x2 peghead configuration.
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The Matsumoku factory had been producing guitars for export for some time, but the 1820 bass (alongside a number of guitar models and the 5120 electric acoustic bass) were the first Epiphone models to be made there. I didn't need to spend much money either, although it did cost a fair bit of time.By the end of the 1960s, a decision had been made to move Epiphone guitar production from the USA (at the Kalamazoo plant where Gibson guitars were made), to Matsumoto in Japan, creating a line of guitars and basses significantly less expensive than the USA-built models (actually less than half the price). All in all it's a great sounding, flexible, clean amp with absolutely no audible hum at all. It was eventually left without tolex covering because it simply would not stick down on such small angular surfaces, but it still looks ten times better than with no back. I had already done work on the cab, removed and treated some black mould, filled a damaged corner, re-glued the tolex and glued in some new aluminium foil, but the missing part would need to be manufactured from scratch. So with the easy part done, I now had to make a new back board for the cabinet. Checking on the scope again showed a good clean 38Watts and a lot more flat out. The original 68k set the valves off at over 50mA each, so in the end I put a 300k in there, which gave them the correct idle at around 60% and -42V. Photo Credit: Our sincere thanks to Richard Beattie for allowing us to use photographs of his amplifier. This makes it a great bolt-inupgrade for the Blues. It also has a pair of brown leads rated 20V at 100mA.
#Fender musicmaster bass amp tubes plus
This is sufficient for a pair of E元4s in fixed bias or a pair of 6L6s in cathode bias or a single ended amp usinga big 6550/KT88 power tube - plus 3 or 4 preamp tubes. Order your new tubes today and get your amp delivering the best sound possible. It will support a power supply rated approximatel圓65V DC at 150mA DC. After measuring one of the bias resistors, which showed infinite resistance to ground, I began experimenting with resistor values. 1980 Fender Musicmaster Bass Tube Type Amplifier Amp Dealer Sheet(s) Parts List. Tubes for sale for Fender Musicmaster Bass 12 watt amps. Although low, it sounded ok though there was some crossover distortion. This showed each E元4 to be only idling at ~18mA.
#Fender musicmaster bass amp tubes full
Next, we checked the bias at full voltage. These were replaced and the Selmer burst back into glorious life. I discovered four unmeasurable resistors and a couple of slightly off ones. I plugged in a guitar but only a tiny distorted output emerged. This time one of them glowed so I repeated the cleaning/tensioning procedure and finally all the valves lit up. After a few checks I decided to clean and re-tension the E元4 sockets again. The pre-amp tubes lit up but unfortunately the power tubes refused to emit the slightest glow. Next, I powered up with a current limiter and a loudspeaker. The 100uF all read above 130uF but all had very low ESR. So what needed doing? After a good cleaning and servicing the pots and valve holders, I tested all the electrolytic capacitors.