Author Archives: admin

JRiver Media Center

JRiver Medida Center Software Installation on Windows PC

My Settings of the JRiver Media Center 24

LTspice Tube Models

Curves created with µTracer and
Tube-Model with ExtractModel Software

Nice tube, the two system are equal Bad tube, the two system are not equal

Measurement-Data with µTracer

ExtractModel Software Comparison of µTracer data / tube model

12AX7 LTspice tube model measured with µTracer and created with ExtractModel Software

— ZIP-File is Virus checked with Kaspersky —

LTspice 12AX7 Tube Model LTspice Tube Test

Original 12AX7 tube curves from Sylvania compared with the curves of a
12AX7 Sylvania Tube measured with µTracer and Tube Model created
with ExtractModel Software and Tube Model tested with LTspice

Audio Note Step Up Kit MC Transformer SUT

Lundahl LL9226 MC Transformer SUT

Ortofon T20 MC Transformer SUT

If you get hum problems, solder left and right
output sockets ground together

Pure Sound T10 MC Transformer SUT

Raphaelite PM30/7K MC Transformer SUT

TEAC CD Z5000 CD Player

The Story
This Player is one of the few good old CD players with two TDA1541A DAC chips in it.
Each channel has one TDA1541A chip with two r2r DAC’s, they are connected parallel together to linearize the DAC transfer of the music signal.
The bad thing is after the DAC’s are old opamps M5238L amplifying the signal.
So this is a modification project for later and then we will see if out of a good player
gets an excellent player.

LTspice Tube Amplifier Simulation

New Version 2.8
Now incl. Tube-Model Creation-Software “Curve Captor”

The Story
I wrote this document mainly for myself, because I’m an amateur user of the
nice LTspice software. In the past I always fail with the transformer simulation
and was not sure how good the tube models are, which I found on the web.
I assume the readers are familiar with LTspice. This manual is a supplement
on how simulate tube amplifiers with LTspice.
Only amplifiers calculated after the physical laws, well soldered,
professional analysed and at the end tested with the human ears,
so you get an audiophile tube amplifier.
LTspice Examples for download, unwrap ZIP-File into new single Folder to enjoy
— ZIP-Files are Virus checked with Kaspersky —

Phono-Preamp SE-Preamp PP-Preamp PP-Poweramp Tube-Test

µTracer for Tube Curves

The Story
The µTracer Kit is an excellent tube curve tracer, because it measures with pulses
and not the old fashion way to kill the tubes with too high continous
voltage/current. With the PC software you can calibrate the hard ware
save/print out the curves.
Also it’s possible to get the curves as numeric files to create with supplementary
software tube models for LTspice. This tube models are out of the tube
you are holding in your hand and not created out of “very nice painted” curves
from the tube manufacturers.

I add also an additional fillament power supply, made out of one more PC power supply,
adjustable step down regulator and digital voltmeter.

Wright Sound WPL10V Phono Preamplifier

HV Statistical Regulator

The Story
At the ETF 2017 in Denmark, Morgan Jones held a speech about “Amplifiers
for high efficiency loudspeakers”.
One part of the presentation was about the “Statistical Regulator” as an
excellent quiet and low noise regulator (see also in his book
“Valve Amplifiers – Fourth Edition” on pages 399 – 405, 418 – 419).
So my first “Statistical Regulator” is now on the bench for testing.

LTspice Example for download, unwrap ZIP-File into new single folder to enjoy
— ZIP-File is Virus checked with Kaspersky —

Statistical Regulator

EMT 930 Turntable

The Story
This turntable in the wooden box is original from the Swiss Army.
In the past they keep hidden radio studios in the Alps in reserves.
So I’m lucky to get this excellent 930 with only a few running hours on it.