Barbouri's Electronics Projects
Restoring vintage electronics along with designing and building new circuits. One eye looking into the past, the other looking into the future.
The Victor 204R is different, but very much the same calculator as the Victor 204 Medalist originally produced by Victor Comptometer Corporation. I picked up this calculator at a better than bargain price, that was almost a giveaway.
After repairing the Nakamichi 610 FM Tuner / Preamp back in late 2023, I have been on the lookout for a FM tuner for the workshop audio system. Since I already had the Hafler DH-110 Preamplifier, I set my sights on the DH-330 FM tuner which has the same styling as the 110 preamp.
I finally came across a hard to find HP 5306A Multimeter/Counter paired with the HP 5300B Display module. It is an interesting module as it converts resistance and DC/AC voltage to a frequency that it then displays on the 5300B display, along with a frequency capability of 40 Hz to 10 MHz.
I was able to pickup a non-working Nicolet Integra 40 oscilloscope for a bargain price. It was built in 2000 and is a 4 channel differential input unit capable of 20 MS/s with 12 bit digitizers and color screen.
After working on EVSE’s “Electric Vehicle Service Equipment” sometimes referred to as chargers for many years, I somehow have amassed a collection of charging cables that I thought were interesting enough to share.
Once again, I was donated a pair of Infinity Infinitesimal speakers by the same generous person, who donated the “System One” rack and three Nakamichi BlackBox series units from a previous post.
I decided to take a gamble on purchasing a Power Designs Inc. TP330 triple output power supply. It was a bit rough looking with a bunch of stickers on the front panel, but no scrape marks from past sticker removal visible. The seller stated that the bottom analog meter was non-functional, but the output terminals measured voltage that changed with the voltage knob.
I was generously donated three Nakamichi BlackBox series units, by the same person who donated the “System One” rack from a previous post.
The units were in great condition, and more than likely could have been used as-is. They also surprisingly came with their original owners manuals, which usually get misplaced or lost over the years.
I found a great deal on a Hewlett Packard 3314A 20 MHz function generator that was non-functional, but overall looked to be in good shape. It arrived in great condition and was well packed for a nice change. The seller clearly stated the issues with this unit such as errors when started up cold, which worsened over time until it finally lost the display and LED’s.
I did not take any pictures of the initial refurbishment of the Nakamichi 610 control preamplifier as it was mainly cleaning and capacitor replacement. But as soon as I thought the work on all the components of the System One rack had been completed, one of the dB meter lamps failed in the 610 preamp.
Included in the rack of Nakamichi “System One” equipment I recently acquired was a 600Ⅱ two head cassette console. This is the same rack that was involved in a building fire and the previously repaired Nakamichi 620 amplifier.
Another nice calculator find for the collection is my CS-2115. It is a 12 digit calculator with a vacuum fluorescent display, memory, and several extra functions.
Repairing and clean-up of a Hewlett Packard (HP)5300B Measuring System with a 5305B 1,300 MHz Counter module.
This was supposed to be just a clean-up project, but this one turned into a bit more work that I had expected.
Continue reading “Hewlett Packard 5300B Measuring System”