coad johnson HV1a Nuvistor Tube Pre Preamp
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coad johnson HV1a Nuvistor Tube Pre Preamp Picture and Description:
conrad johnson tube-type pre-preamplifier (head amp) for low-output moving coil cartridges using 2 6CW4 nuvistors. This unit was designed to supplement cj preamps like the Premier Two to provide enough gain for MC cartridges. The preamp is in good working order. There is some background hiss, as with all low-level active pre-preamps, but with my MC cartridges it is not a problem. The nuvistors (the last stage in the techincal development of vacuum tubes) get noisier as they build up operating hours, so retubing might be necessary for some applications. I'm selling this because I've decided I like the sound of transformer coupling for my MC cartridges, but this is strictly a matter of taste, and also varies from one type of MC cartridge to another. Cosmetically, the unit is excellent to near-mint. Note that the amp board in the preamp has to be screwed down for shipping. When in use, the screws should be loosened to allow the board to float on its rubber shock mounts. These mounts are just plain rubber bands, which stretch with age, so they might need to be replaced if they don't provide enough "float" and thus freedom from microphonics, a characteristic of nuvistors. Replacing the rubber bands is a simple matter. This is explained in the owners' manual, which is included. Original box is also included. I've tried to describe this item as well as I can. If you have specific issues, please ask. The item is sold as-is, no returns. No non-USA shipping addresses.