||2 x 240V = 480V
|II||2 x 225V = 450V
|III||2 x 225V = 450V
||2 x 225V = 450V
|50, 100, 150 or 200
||Fig 2 2-Prong trigger socket
accepts the then common 115VAC extension cords.
||Fig 3 Space available for two batteries
is about 4.5" x 6"
|Fig 4 Pencil line between banana
plugs is internal short connection. Although the
HV connector has 4 holes only three of them have
terminals. Ground, HV and trigger. By
placing the HV capacitors in the battery box and running
a long coiled wire to the flash tube the inductance in
the flash circuit is much higher than when there is a
physically short path for the connection between the
caps and the flash tube.
||Fig 5 Idea for Battery Adpater
||Fig 6 Inside battery box is just a switch
and 8 caps.
|Fig 7 Note my analysis had the
polarity wrong and it's
been reversed in this photo. The current is dropping over time
unlike with the wrong polarity is was around 88 mA and staying high.
This is a Consort EV625 Electrophoresis (Wiki) Power Supply
Rated at: 600 V, 500 mA, 150 Watts. Got it on eBay for about $50 including shipping. A much lower cost than buying a regular HV bench power supply. Was sold AS IS, but it seems fine to me. A little tricky to program, i.e. the first method must be a ramp then the second method can hold the voltage for up to 99h59min.
This is a newer lower power version of the Graflex
Stroboflash IV. It uses a single510 Volt Eveready
No. 497 battery.
The box holds only a battery and there is a 2 conductor cable that runs to the flash head. The connector on the side of the battery box has a male and a female contact.
There may be capacitors in the handle of the flash head since the handle part is not detachable from the head.
Reference Graflex Historic Quarterly Vol 14, Issue 3, pg 7 (also has the Graflex SlaveSync).
For use with the Graflex Strobomatic 500 HV and Graflex Strob
250 and by adding the adapter cord Stroboflash power packs can
This is a small box with three functions.
A charging function intended to "top up" a carbon zinc type battery. But this is a controversial concept on a primary battery.
A GE diode marked GE 6RS5GH30BAB1 (with a high forward resistance) rectifies the AC coming out of the power transformer and the half-wave signal is fed to to the battery. The diode is a spring loaded stack of disks, probably Selenium (Wiki). GEJ-1238A Instructions Selenium Rectifier Stacks - shows the 6RS series, and mentions the low current cells, but no specs.+ 233 VDC on the shrouded (female) contact in boost mode (do not see how that's going to charge a 500 V battery?, maybe the rectifier is no good?).
Measures battery voltage and can be used to get an idea of how the caps are working.
A way to check the health of a battery by measuring battery voltage with a 3k4 load (500V / 3k4 Ohms) about 150 mA load.
GR Impedance Bridges
GR Sound measuring equipment
GR Strobotac with patent links
LM631A Amprobe (Meterman) LM631A Digital Light Meter
Macbeth Illuminometer -
Metering strobe flash - Thomas Strobometer Model 1B
Nikon SB25 on camera strobe flash
Nikon on camera flash units
Photo Studio Strobe Flash w/ Einstein 640 & Thomas Strobemeter Model 1B -
Weston Model 594 Photronic Cell light sensor, & Weston 614, 615, 650, 703, 756, 819 & others