Antique Electronics and Vintage Solid State

I collect and restore antique vacuum tube electronics (i.e. "boatanchors") and vintage solid-state gear.


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Triplett 630-APLK Type 5 VOM Unboxing

Some time ago I bought a new-old-stock Triplett 630-APLK VOM from Barno Electronics near Pittsburgh, PA.

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In the past, I've also written about buying a new-old-stock Triplett 639-OS meter case and some

Regency AR-136 Flight Monitoradio

A friend salvaged this from the Boxborough town dump. 

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It’s an aviation band receiver (108 to 136 Megacycles, amplitude modulation), one of several models of Monitoradio sold by Regency. They were forerunners of the scanner. …

Bench lighting – Luxo Magnifier

I inherited my father’s swing-arm Luxo Magnifier lamp. 

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He used it for drafting back in the early 1960’s, when he worked at Atlantic and Gulf Stevedores working up stowage drawings for general cargo ships.

Analysis of DC zero circuit in the HP 3466A DMM

Can someone explain how the DC zero on the HP 3466A works? The manual with the full schematic is on the Keysight web-site:

The first thing to note is that the topology of the input amplifier is non-inverting on the 20 mV and 200 mV ranges, and is switched to inverting on the higher ranges. …

Erectronics potentiometer

I came across this item in a box of random parts that someone gave to me.

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It’s a potentiometer that was once part of an Erectronics breadboard system.

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The Erectronics system was an interesting solderless breadboard. …

Sylvania Polymeter 134 and 134Z Manuals

Thanks to Kent Stephenson for scanning his copies of the manuals

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 for the Sylvania Polymeter Model 134 

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and Polymeter Model 134Z

I’ve added them to my Liberated Manuals and Books archive.

Sylvania Polymeter 134 Ad Dec 1946

He also provided a

Tektronix 454A loose BNC

The mounting nut on the Channel 1 BNC connector of my Tektronix 454A was loose.

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It’s painful to get access as the channel 1 and 2 input circuitry is shielded. The screws are not Phillips; they are instead Pozidriv. …

Krohn-Hite UHR-220 Power Supply

I’ve acquired a Krohn-Hite UHR-220 high voltage power supply. Thanks Ross!

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I really like the styling on these old Krohn-Hites.

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The Jones socket offers the same voltages as the binding posts on the front panel. …

Tektronix 2213 focus repair

I was checking out my Tek 2213 scope before selling it, and noticed that the focus was fuzzy. 

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A little Duck-duck-go-ing informed me that this is a fairly common problem in this series of Tek scopes.

Probe accessories for the GR 1806-A VTVM

Over on the Antique Radio Forum, Philip Colston was asking about accessories for the RF probe of the General Radio 1806-A VTVM.

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It turns out that the tips are identical to the accessory tips for the Tektronix P6000-series scope probes:

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