Upcoming projects

In this section, I will show what I have in my mind and plan to build in the future (near or far). Even if a project ends up here, there are no guarantee that it will be completed or even started. It depends much on avaiable free time and on cost. Specially designing tube gear tend to cost a lot.
This page will not show tube plans only - also other projects will show up here. All completed designs will then be moved out from this list and find it's place in the list of complete projects.

The KT-88 10W Single-Ended power amplifier
This is a rather compact (for a tube amplifier) SE output stage giving 10W Class-A for each channel. It uses KT-88 power beam tetrodes and Lundahl output transformes. The power supply will be built around a Hammond power transformer.
A preview of the final amplifier - the components are just put there for the picture.
A lot of cabling are still missing and the power supply have to be built - I plan to use electronic regulations for all the different powers needed, including the heaters.
A close-up of the tube setup. 2 x KT-88, one 5U4G rectifier and two ECC83 in a SRPP input stage. All tubes are from Ruby Tubes.
If you look closley, then you can see my picture in the top of the power tubes :-)
Output transformers are from Lundahl. They will be mounted inside the amplifier. It is possible due to their compact size. This also makes the amplifier safer for the users.
 
Power OTL with 6C33
This project haven't started yet. The only practical part yet performed was to get a pair of 6C33C-B power triodes. These mighty tubes (the big one in the middle - to the right is an EL34 and to the left one E88CC, in the front two transistors - one in TO92 package and one TO220, just for size compare) was originally used as voltage regulator pass elements in russian MIG-25 jet fighters. In the middle of the 70's, the tube ended up in the hands of the japanese audiophiles. They found that the tube was excellent to use in OTL-amplifier due to it's low interal resistance. It is also capable to handle large currents.
My design will follow the Futterman design (with the Techincs twist) and it will use modern semiconductors where it is suitable to furhter optimize the design (except in the signal path - it will be all tube).


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