Marantz Spectroscope EC5..
Do we want to supply it with a 9v supply or +48v from the mixer?
Ideally, 48V would be simplest to use.
9V would work well with a little adapter fun.
Either way, unless the photos I saw weee wrong, it will need a TRS plug and cable to replace the original attached to the mic.
That's the Grateful Dead taping mic![]()
I bet we can build this legend a phantom powered preamp and send it to him for a smile.
I agree that a D cell solution would last much longer. But a phantom powered box would also be super simple to interface that mic with modern mixers.With that provenance in mind, I was trying to mod the mic as minimally as possible and leave it still capable of being used in its original manner....![]()
I agree that a D cell solution would last much longer. But a phantom powered box would also be super simple to interface that mic with modern mixers.
I have found simpler pretty much always sounds better. If there was the perfect theoretical piece of wire with gain .. we would all find nirvana .True. However, both anecdotal and personal experience with super simple circuits (like the mic's buffer likely is) tells me that the power supply can affect the tonal quality. Careful choice of the power supply's output impedance would be important to mimic that of the AA battery. D cell would be a little lower, but still comparable. The simpler the circuit, the more the qualities of each part make a difference, and the power supply is a part of the circuit.![]()
That sounds awesome.Currently, it has a 1/8" TS plug and coax cord, if the pics I saw on the forum were correct.
My plan would replace that with a cord set up with 1/8" TRS, and send DC in via the ring and shield, keeping the mic as close to original operation as possible by connecting the ring to the appropriate internal AA battery terminal. A stereo splitter would let the output be connected as it was before and give an injection point for the DC. A couple diodes and a resistor would make a decent regulated voltage drop, and could be wired up on the male TRS plug of the other stereo splitter with little difficulty, so you plug the 9V in one side and get 1.4-ish Volts on the other. I opted for a high-ish current capability for the supply, based on @dr bonkers stating it was killing AA batteries.
Wonder how those users make it through whole Dead shows.That's the Grateful Dead taping mic![]()
Wonder how those users make it through whole Dead shows.
That's what I am thinking or a component out of tolerance that is draining it faster. Most battery powered devices don't see use for almost 50 years.Marantz' literature states 6000 hour battery life. Given no switch to disconnect the battery when not in use, that includes time in the carrying case. I wonder if there is a fault that is draining the battery quicker....