The Preamplifier to End All Preamplifiers
is Alive and Kicking.
This is the finished preamplifier that is built in two boxes, one for the power supply and one that includes a tube RIAA and The Preamplifier pictured below. The tubes are all current source loaded and the pre is parafeed coupled to a 1010/1701b Sowter transformer. The tubes used are 5842/417 for the RIAA and EC8010 for the preamplifier.
A Vanity Affair
Now that the digital audio technology reached its peak and anything sounds like everything, I felt the urge to step back to the day mono ruled.
It was a resistless affair for me to build this mono phono preamplifier that is based in an old RCA schematic I came across in the net, that includes four different equalisations for old LPs.
The preamplifier pictured above is current source loaded and parafeed coupled to a 1010/1701b Sowter transformer, for the highest sound quality. There are two versions of this preamp, one with a pair of 5842/417 tubes for the made in U S A tube admirers and one with EC8010 for the Made in West Germany product lovers.
The beautiful preamplifier with the Sifam Vu meters uses a pair of 417 / 5842 tubes that are parafeed transformer coupled for balanced output, there is also included a solid state RIAA pre. The pre was tested and performs dead flat from 20Hz to 25Khz.
This is another beauty, using a pair of 7788 tubes and it is transformer coupled with LL1671. Note that part of the power supply is in another box.
It also includes driver card with TL074 for the Vu meters and a phono RIAA pre with ICs for vinyl records.
This peculiar preamplifier was build on a shoe string and uses a pair of 5842 tubes. It is transformer coupled for balanced output, and there is also the choice for balanced (low Z input) or unbalanced (high Z) input . Note that the power supply is in an other box. Click here or on the picture for the measurements of this pre.
NICE PICTURES OF OLD STUFF