A couple of days back, Lofton posted a message on the DIY Audio Projects Forum letting us know that the S-5 Electronics K-12G Tube Amp Kits are once again available (Thanks Lofton). Well, this is great news and now we have an answer to a very common question that we get.
The photo below shows the contents of the recent K-12G Tube Amplifier Kit.
The contents are very similar to the previous kits which came with the 10GV8 tubes. One thing that I did note is that the power transformer appears to be larger than the one which came with my K-12M Tube Amp Kit. This should be an improvement as my K-12M power transformer runs hot, but in fairness, has not failed even after several years of use. The K-12G kits are modestly priced at $189.95 and available from Tube Depot. Right now (Feb 2009) Tube Depot is offering a free 3.5mm to dual RCA cable that you can use to connect the tube amp to your portable music player. It's not clear if this is a limited time offer.
Please note that these kits do not come with an enclosure. Instead they come with a pine board which will allow you to mount all of the parts and put together a fully functional amplifier. However, this will not be practical and possibly unsafe for most environments. There is high voltage present on the board and the tubes get very hot, so you don't want little fingers or paws poking around the amplifier. So be prepared to construct or buy a suitable enclosure for the kit.
Update March 2009: Here is a finished photo of Lofton's K-12G Tube Amplifier Kit.
If you do pick up one of these simple and fun tube amp kits, here are a few links that will give you some enclosure and modification ideas.
S-5 Electronics Tube Amplifier Kit Resources:
- S-5 Electronics Tube Amp Kit Photo Gallery
- Bruce's Modified K-12M Tube Amp Kit
- Mark's K-12M Tube Amplifier Kits
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