gofar99 Messages: 1955 Registered: May 2010 Location: Southern Arizona
Illuminati (5th Degree)
Hi Everyone, My latest creation an integrated tube preamplifier. It uses only tubes in the active circuitry but has a digital remote control volume (resistor switched by relays) and source selection. Full phono preamp (like the Groove) and allows for passive or active line stage with a gain of 15 db. Still breaking in, but sounds lovely.
It is not a simple project, although a good diyer could do it. Care in layout and wiring technique is important. I'll post a schematic when I get one cleaned up. BTW the PS uses 1500uf of 500VDC caps, heaters another 15,000 more and about 30uf of polys.
Attachment:Pre In system.jpg (Size: 190.73KB, Downloaded 2648 times)
gofar99 Messages: 1955 Registered: May 2010 Location: Southern Arizona
Illuminati (5th Degree)
Hi, Thanks, It sounds better than I thought it would with the substitute caps (Jantzen Crosscaps) in place of the Silver Zs on order and the power supply voltages are low by about 10% (new design transformer coming to fix that). Still a really clean sound. I expect to burn it in for a week or so and then do measurements on it.
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