Silicon Components
for Tube Circuits
SiTubes makes semiconductor-based modules that are
designed to work in or with vacuum-tube electronics.
Buy SiTubes modules online at the
pmillett eBay store
Questions? email
info@situbes.com
SiALM
Audio Level Meter
The SiTubes ALM is an audio level
meter, packaged in a standard octal tube envelope.
It integrates a peak-responding full-wave
rectifier circuit to display audio power level. It provides a
128-segment bar graph on an OLED display, with several programmable
scaling and legend options.
The ALM can be powered from an AC or DC voltage,
and the power supply input is completely isolated from the signal input.
This allows the ALM to be powered from any available supply, such as a
6.3V AC filament circuit, even if it is floating with respect to the
signal input.
For more details, please download the full
ALM datasheet (PDF file).
Video of
the ALM in action!
SiDPM
Digital "Panel" Meter
The SiTubes DPM is a digital "panel"
meter packaged in a standard octal tube envelope.
It measures a DC input voltage from 0
to 2V full-scale. Several selectable legends (V, mA, A, etc.) can be
selected by an external programming resistor. It is particularly
useful to measure supply voltages (such as plate voltage) and tube bias
levels (normally plate current) in tube amplifiers.
The DPM can be powered from an AC or
DC voltage. The power input is isolated from the measurement input, so
floating measurements can be made up to 1500V above or below the power
input. This allows high-side current measurements - for example,
sensing plate current directly at the tube plate - or the ability to
be powered from a supply that is not referred to ground.
For more details, please download the
full DPM datasheet (PDF file).
SiFWR Full-Wave Rectifier
The SiTubes FWR is an octal solid-state rectifier tube
replacement.
Employing 1200V Silicon Carbide Schottky rectifiers,
it can directly replace full-wave rectifier tubes like the 5U4, 5AR4, and
other tubes with similar pinouts.
For more details, please download the full
FWR datasheet (PDF file).
SiTDR Time Delay Relay
The SiTubes TDR is a time delay relay, capable of
controling AC or DC voltages. It is available in two versions: The
TDR-HV can switch voltages up to 1000V (DC or peak AC) at up to 0.9A, and the
TDR-LV can switch voltages up to 60V at load currents up to 6.5A.
The TDR-HV is well suited for delaying the
application of B+ voltage in directly-heated tube circuits.
The delay time is programmable from zero up to 256
seconds using an external programming resistor.
The TDR is packaged in a standard octal tube
envelope, and can replace standard octal glass delay relays.
For more details, please download the full
TDR datasheet (PDF file).
SiBRX Bridge Rectifier
The SiTubes BRX is a simple bridge rectifier packaged in
a standard octal tube envelope. The BRX-HV uses Silicon Carbide Schottky
rectifiers rated at 1200V, 1A; the BRX-LV is rated at 100V, 10A.
The BRX-HV is useful in B+ power supply circuits
using bridge or hybrid bridge (tube plus solid-state) rectifier circuits.
The BRX-LV can be used to generate DC supplies for filament supplies.
For more details, please download the full
BRX datasheet (PDF file).
SiLPF
Low-Power Isolated DC Filament Supply
The SiTubes LPF is an isolated flyback power supply
intended to be used as a DC filament or heater supply. It operates from an
AC or DC voltage, and generates 1V - 7VDC output at 5 watts or 1.6A (whichever
is greater).
The output of the LPF is galvanically isolated from
the input, and can float up to 1500V above or below the input. This
allows it to power DHT filaments that need to operate at DC bias, while
powered from a standard heater supply.
For more details, please download the full
LPF datasheet (PDF file).