A cheap fantasy….

Yes, it’s a not a very good joke – sorry! 🙂

Haven’t done one of these “cheap kits” for a while, but I am possibly getting a bit more picky. However, this particular board was around 20 USD for a kit (excl. tubes) and so the risk was manageable. It’s supposedly a clone of the famous Matisse “Fantasy” preamp which uses 5670 tubes. I wouldn’t know to be honest, but I have been intrigued by low(ish)-voltage tube circuits for a long time and so I took the plunge.

I’ve replaced some components (mainly the capacitors and the volume pot), but there was still plenty of kit parts left to salvage to make it worthwhile (tube sockets, semiconductors, heat sinks etc.) over buying just a blank PCB. The caps probably would have worked just fine, so that replacement was mainly cosmetic. One notably exception was the 80V rated electrolytic in a part of the circuit that sees rectified 55-60VAC – a little too close to the limit for my liking.

The tubes ‘ve bought from an Eastern European seller and they are 6n3p-E which is supposedly a long-life Russian version of the 5670. The circuit runs off 50-60VAC, so it’s what I would call a “medium-voltage” project. As usual, the instructions that came with the kit were poor (especially if you can’t read Chinese 😉 ) but with a bit of care it wasn’t a problem to put together.

Sound quality? Well, as usual with these projects I’ve only really done basic bench testing for now and so the only thing I can really confirm is that it produces sound. One of the things I did notice though was that it seems to be a well-behaved circuit. By that I mean no big turn-on/turn-off transients, no excessive noise and no microphonics from the tubes. I might just have to splurge for a proper transformer and case for this anyway…

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2 Responses to A cheap fantasy….

  1. Eric says:

    Hi,

    Could you please provide the e-bay link. Thanks.

    • theslowdiyer says:

      Hi Eric,

      The problem with direct links is that they die, but if you search your favourite site (ebay, aliexpress etc.) for “matisse fantasy kit”, “5670 tube preamp” or something similar then you should find plenty of options.

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